Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

52 files changed, 14869 insertions, 0 deletions

diff --git a/src/lib/process/Makefile.am b/src/lib/process/Makefile.am
new file mode 100644
index 0000000..cb20ab8
--- /dev/null
+++ b/src/lib/process/Makefile.am
@@ -0,0 +1,99 @@
+SUBDIRS = cfgrpt . testutils tests
+# DATA_DIR is the directory where to put PID files.
+dhcp_data_dir = @runstatedir@/@PACKAGE@
+AM_CPPFLAGS  = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -DDATA_DIR="\"$(dhcp_data_dir)\""
+
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Ensure that the message file is included in the distribution
+EXTRA_DIST = process_messages.mes libprocess.dox
+
+CLEANFILES = *.gcno *.gcda
+
+# Generated by configure files
+DISTCLEANFILES = spec_config.h.pre
+
+lib_LTLIBRARIES = libkea-process.la
+libkea_process_la_SOURCES  = cb_ctl_base.h
+libkea_process_la_SOURCES += config_base.cc config_base.h
+libkea_process_la_SOURCES += config_ctl_info.cc config_ctl_info.h
+libkea_process_la_SOURCES += config_ctl_parser.cc config_ctl_parser.h
+libkea_process_la_SOURCES += d_cfg_mgr.cc d_cfg_mgr.h
+libkea_process_la_SOURCES += d_controller.cc d_controller.h
+libkea_process_la_SOURCES += d_log.cc d_log.h
+libkea_process_la_SOURCES += d_process.h
+libkea_process_la_SOURCES += daemon.cc daemon.h
+libkea_process_la_SOURCES += log_parser.cc log_parser.h
+libkea_process_la_SOURCES += logging_info.cc logging_info.h
+libkea_process_la_SOURCES += process_messages.cc process_messages.h
+libkea_process_la_SOURCES += redact_config.cc redact_config.h
+
+libkea_process_la_CXXFLAGS = $(AM_CXXFLAGS)
+libkea_process_la_CPPFLAGS = $(AM_CPPFLAGS)
+libkea_process_la_LDFLAGS  = $(AM_LDFLAGS)
+libkea_process_la_LDFLAGS += -no-undefined -version-info 57:0:0
+
+libkea_process_la_LIBADD  = $(top_builddir)/src/lib/process/cfgrpt/libcfgrpt.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/http/libkea-http.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/database/libkea-database.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/util/libkea-util.la
+libkea_process_la_LIBADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libkea_process_la_LIBADD += $(LOG4CPLUS_LIBS) $(BOOST_LIBS)
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f process_messages.h process_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+if GENERATE_MESSAGES
+
+# Define rule to build logging source files from message file
+messages: process_messages.h process_messages.cc
+	@echo Message files regenerated
+
+process_messages.h process_messages.cc: process_messages.mes
+	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/process/process_messages.mes
+
+else
+
+messages process_messages.h process_messages.cc:
+	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+endif
+
+# Specify the headers for copying into the installation directory tree.
+libkea_process_includedir = $(pkgincludedir)/process
+libkea_process_include_HEADERS = \
+	cb_ctl_base.h \
+	config_base.h \
+	config_ctl_info.h \
+	config_ctl_parser.h \
+	daemon.h \
+	d_cfg_mgr.h \
+	d_controller.h \
+	d_log.h \
+	d_process.h \
+	logging_info.h \
+	log_parser.h \
+	process_messages.h \
+	redact_config.h
diff --git a/src/lib/process/Makefile.in b/src/lib/process/Makefile.in
new file mode 100644
index 0000000..c0f22ae
--- /dev/null
+++ b/src/lib/process/Makefile.in
@@ -0,0 +1,1146 @@
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+	config_ctl_info.cc config_ctl_info.h config_ctl_parser.cc \
+	config_ctl_parser.h d_cfg_mgr.cc d_cfg_mgr.h d_controller.cc \
+	d_controller.h d_log.cc d_log.h d_process.h daemon.cc daemon.h \
+	log_parser.cc log_parser.h logging_info.cc logging_info.h \
+	process_messages.cc process_messages.h redact_config.cc \
+	redact_config.h
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+	$(top_builddir)/src/lib/config/libkea-cfgclient.la \
+	$(top_builddir)/src/lib/http/libkea-http.la \
+	$(top_builddir)/src/lib/dhcp/libkea-dhcp++.la \
+	$(top_builddir)/src/lib/hooks/libkea-hooks.la \
+	$(top_builddir)/src/lib/database/libkea-database.la \
+	$(top_builddir)/src/lib/cc/libkea-cc.la \
+	$(top_builddir)/src/lib/asiolink/libkea-asiolink.la \
+	$(top_builddir)/src/lib/log/libkea-log.la \
+	$(top_builddir)/src/lib/util/libkea-util.la \
+	$(top_builddir)/src/lib/exceptions/libkea-exceptions.la \
+	$(LOG4CPLUS_LIBS) $(BOOST_LIBS)
+
+# Specify the headers for copying into the installation directory tree.
+libkea_process_includedir = $(pkgincludedir)/process
+libkea_process_include_HEADERS = \
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+	config_base.h \
+	config_ctl_info.h \
+	config_ctl_parser.h \
+	daemon.h \
+	d_cfg_mgr.h \
+	d_controller.h \
+	d_log.h \
+	d_process.h \
+	logging_info.h \
+	log_parser.h \
+	process_messages.h \
+	redact_config.h
+
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+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib/process/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib/process/Makefile
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+	  *config.status*) \
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+	done
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+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
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+	-rm -f ./$(DEPDIR)/libkea_process_la-logging_info.Plo
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+	-rm -f ./$(DEPDIR)/libkea_process_la-redact_config.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-libkea_process_includeHEADERS
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libkea_process_la-config_base.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-config_ctl_info.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-config_ctl_parser.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-d_cfg_mgr.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-d_controller.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-d_log.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-daemon.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-log_parser.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-logging_info.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-process_messages.Plo
+	-rm -f ./$(DEPDIR)/libkea_process_la-redact_config.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic \
+	maintainer-clean-local
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-libLTLIBRARIES \
+	uninstall-libkea_process_includeHEADERS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic \
+	clean-libLTLIBRARIES clean-libtool cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-libLTLIBRARIES \
+	install-libkea_process_includeHEADERS install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic \
+	maintainer-clean-local mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-libLTLIBRARIES \
+	uninstall-libkea_process_includeHEADERS
+
+.PRECIOUS: Makefile
+
+
+# If we want to get rid of all generated messages files, we need to use
+# make maintainer-clean. The proper way to introduce custom commands for
+# that operation is to define maintainer-clean-local target. However,
+# make maintainer-clean also removes Makefile, so running configure script
+# is required.  To make it easy to rebuild messages without going through
+# reconfigure, a new target messages-clean has been added.
+maintainer-clean-local:
+	rm -f process_messages.h process_messages.cc
+
+# To regenerate messages files, one can do:
+#
+# make messages-clean
+# make messages
+#
+# This is needed only when a .mes file is modified.
+messages-clean: maintainer-clean-local
+
+# Define rule to build logging source files from message file
+@GENERATE_MESSAGES_TRUE@messages: process_messages.h process_messages.cc
+@GENERATE_MESSAGES_TRUE@	@echo Message files regenerated
+
+@GENERATE_MESSAGES_TRUE@process_messages.h process_messages.cc: process_messages.mes
+@GENERATE_MESSAGES_TRUE@	$(top_builddir)/src/lib/log/compiler/kea-msg-compiler $(top_srcdir)/src/lib/process/process_messages.mes
+
+@GENERATE_MESSAGES_FALSE@messages process_messages.h process_messages.cc:
+@GENERATE_MESSAGES_FALSE@	@echo Messages generation disabled. Configure with --enable-generate-messages to enable it.
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/process/cb_ctl_base.h b/src/lib/process/cb_ctl_base.h
new file mode 100644
index 0000000..7baf8dd
--- /dev/null
+++ b/src/lib/process/cb_ctl_base.h
@@ -0,0 +1,373 @@
+// Copyright (C) 2019-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CB_CTL_BASE_H
+#define CB_CTL_BASE_H
+
+#include <database/audit_entry.h>
+#include <database/backend_selector.h>
+#include <database/server_selector.h>
+#include <process/config_base.h>
+#include <process/config_ctl_info.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <process/d_log.h>
+
+namespace isc {
+namespace process {
+
+
+/// @brief Base class for implementing server specific mechanisms to control
+/// the use of the Configuration Backends.
+///
+/// Every Kea server using Config Backend as a configuration repository
+/// fetches configuration available for this server during startup and then
+/// periodically while it is running. In both cases, the server has to
+/// take into account that there is some existing configuration that the
+/// server already knows, into which the configuration from the database
+/// has to be merged.
+///
+/// When the server starts up, the existing configuration is the one that
+/// the server reads from the configuration file. Usually, the configuration
+/// fetched from the file will be disjointed with the configuration in the
+/// database, e.g. all subnets should be specified either in the configuration
+/// file or a database, not in both. However, there may be other cases when
+/// option definitions are held in the configuration file, but the DHCP
+/// options using them are stored in the database. The typical configuration
+/// sequence upon the server startup will be to build the staging
+/// configuration from the data stored in the configuration file and then
+/// build another partial configuration from the data fetched from the
+/// database. Finally, both configurations should be merged and committed
+/// if they are deemed sane.
+///
+/// When the server is already running it may use "audit" (a.k.a. journal)
+/// to periodically check if there are any pending configuration updates.
+/// If changes are present, it will be fetched and used to create a new
+/// configuration object (derived from the @c ConfigBase) holding this
+/// partial configuration. This configuration has to be subsequently
+/// merged into the current configuration that the server is using.
+///
+/// Note the difference between these two use cases is that in the first
+/// case the fetched configuration is fetched into the staging configuration
+/// and then committed, and in the second case it has to be directly merged
+/// into the running configuration.
+///
+/// This class contains some common logic to facilitate both scenarios which
+/// will be used by all server types. It also contains some pure virtual
+/// methods to be implemented by specific servers. The common logic includes
+/// the following operations:
+/// - use the "config-control" specification to connect to the specified
+///   databases via the configuration backends,
+/// - fetch the audit trail to detect configuration updates,
+/// - store the timestamp and id of the most recent audit entry fetched
+///   from the database, so as next time it can fetch only the later updates.
+///
+/// The server specific part to be implemented in derived classes must
+/// correctly interpret the audit entries and make appropriate API calls
+/// to fetch the indicated configuration changes. It should also merge
+/// the fetched configuration into the staging or current configuration.
+/// Note that this class doesn't recognize whether it is a staging or
+/// current configuration it is merging into. It simply uses the instance
+/// provided by the caller.
+///
+/// @tparam ConfigBackendMgrType Type of the Config Backend Manager used
+/// by the server implementing this class. For example, for the DHCPv4
+/// server it will be @c ConfigBackendDHCPv4Mgr.
+template<typename ConfigBackendMgrType>
+class CBControlBase {
+public:
+
+    /// @brief Fetch mode used in invocations to @c databaseConfigFetch.
+    ///
+    /// One of the values indicates that the entire configuration should
+    /// be fetched. The other one indicates that only configuration updates
+    /// should be fetched.
+    enum class FetchMode {
+        FETCH_ALL,
+        FETCH_UPDATE
+    };
+
+    /// @brief Constructor.
+    ///
+    /// Sets the time of the last fetched audit entry to Jan 1st, 2000,
+    /// with id 0.
+    CBControlBase()
+        : last_audit_revision_time_(getInitialAuditRevisionTime()),
+          last_audit_revision_id_(0) {
+    }
+
+    /// @brief Virtual destructor.
+    ///
+    /// It is always needed when there are virtual methods.
+    virtual ~CBControlBase() {
+        databaseConfigDisconnect();
+    }
+
+    /// @brief Resets the state of this object.
+    ///
+    /// Disconnects the configuration backends resets the recorded last
+    /// audit revision time and id.
+    void reset() {
+        databaseConfigDisconnect();
+        last_audit_revision_time_ = getInitialAuditRevisionTime();
+        last_audit_revision_id_ = 0;
+    }
+
+    /// @brief (Re)connects to the specified configuration backends.
+    ///
+    /// This method disconnects from any existing configuration backends
+    /// and then connects to those listed in the @c ConfigControlInfo
+    /// structure within the @c srv_cfg argument. This method is called
+    /// when the server starts up. It is not called when it merely
+    /// fetches configuration updates.
+    ///
+    /// @param srv_cfg Pointer to the staging server configuration.
+    ///
+    /// @return true if the server found at least one backend to connect to,
+    /// false if there are no backends available.
+    bool databaseConfigConnect(const ConfigPtr& srv_cfg) {
+        // We need to get rid of any existing backends.  These would be any
+        // opened by previous configuration cycle.
+        databaseConfigDisconnect();
+
+        // Fetch the config-control info.
+        ConstConfigControlInfoPtr config_ctl = srv_cfg->getConfigControlInfo();
+        if (!config_ctl || config_ctl->getConfigDatabases().empty()) {
+            // No config dbs, nothing to do.
+            return (false);
+        }
+
+        // Iterate over the configured DBs and instantiate them.
+        for (auto db : config_ctl->getConfigDatabases()) {
+            LOG_INFO(dctl_logger, DCTL_OPEN_CONFIG_DB)
+                .arg(db.redactedAccessString());
+            getMgr().addBackend(db.getAccessString());
+        }
+
+        // Let the caller know we have opened DBs.
+        return (true);
+    }
+
+    /// @brief Disconnects from the configuration backends.
+    void databaseConfigDisconnect() {
+        getMgr().delAllBackends();
+    }
+
+    /// @brief Fetches the entire or partial configuration from the database.
+    ///
+    /// This method is called by the starting up server to fetch and merge
+    /// the entire configuration from the database or to fetch configuration
+    /// updates periodically, e.g. as a result of triggering an interval
+    /// timer callback.
+    ///
+    /// @param srv_cfg pointer to the staging configuration that should
+    /// hold the config backends list and other partial configuration read
+    /// from the file in case the method is called upon the server's start
+    /// up. It is a pointer to the current server configuration if the
+    /// method is called to fetch configuration updates.
+    /// @param fetch_mode value indicating if the method is called upon the
+    /// server start up or it is called to fetch configuration updates.
+    virtual void databaseConfigFetch(const ConfigPtr& srv_cfg,
+                                     const FetchMode& fetch_mode = FetchMode::FETCH_ALL) {
+        // If the server starts up we need to connect to the database(s).
+        // If there are no databases available simply do nothing.
+        if ((fetch_mode == FetchMode::FETCH_ALL) && !databaseConfigConnect(srv_cfg)) {
+            // There are no CB databases so we're done
+            return;
+        }
+
+        LOG_INFO(dctl_logger, DCTL_CONFIG_FETCH);
+
+        // For now we find data based on first backend that has it.
+        db::BackendSelector backend_selector(db::BackendSelector::Type::UNSPEC);
+
+        // Use the server_tag if set, otherwise use ALL.
+        std::string server_tag = srv_cfg->getServerTag();
+        db::ServerSelector server_selector =
+            (server_tag.empty()? db::ServerSelector::ALL() : db::ServerSelector::ONE(server_tag));
+
+        // This collection will hold the audit entries since the last update if
+        // we're running this method to fetch the configuration updates.
+        db::AuditEntryCollection audit_entries;
+
+        // If we're fetching updates we need to retrieve audit entries to see
+        // which objects have to be updated. If we're performing full reconfiguration
+        // we also need audit entries to set the last_audit_revision_time_ to the
+        // time of the most recent audit entry.
+
+        /// @todo We need a separate API call for the latter case to only
+        /// fetch the last audit entry rather than all of them.
+
+        // Save the timestamp indicating last audit revision time.
+        auto lb_modification_time = last_audit_revision_time_;
+        // Save the identifier indicating last audit revision id.
+        auto lb_modification_id = last_audit_revision_id_;
+
+        audit_entries = getMgr().getPool()->getRecentAuditEntries(backend_selector,
+                                                                  server_selector,
+                                                                  lb_modification_time,
+                                                                  lb_modification_id);
+        // Store the last audit revision time. It should be set to the most recent
+        // audit entry fetched. If returned audit is empty we don't update.
+        updateLastAuditRevisionTimeId(audit_entries);
+
+        // If this is full reconfiguration we don't need the audit entries anymore.
+        // Let's remove them and proceed as if they don't exist.
+        if (fetch_mode == FetchMode::FETCH_ALL) {
+            audit_entries.clear();
+        }
+
+        // If we fetch the entire config or we're updating the config and there are
+        // audit entries indicating that there are some pending updates, let's
+        // execute the server specific function that fetches and merges the data
+        // into the given configuration.
+        if ((fetch_mode == FetchMode::FETCH_ALL) || !audit_entries.empty()) {
+            try {
+                databaseConfigApply(backend_selector, server_selector,
+                                    lb_modification_time, audit_entries);
+            } catch (...) {
+                // Revert last audit revision time and id so as we can retry
+                // from the last successful attempt.
+                /// @todo Consider reverting to the initial value to reload
+                /// the entire configuration if the update failed.
+                last_audit_revision_time_ = lb_modification_time;
+                last_audit_revision_id_ = lb_modification_id;
+                throw;
+            }
+        }
+    }
+
+protected:
+
+    /// @brief Returns audit entries for new or updated configuration
+    /// elements of specific type to be fetched from the database.
+    ///
+    /// This is convenience method invoked from the implementations of the
+    /// @c databaseConfigApply function. This method is invoked when the
+    /// server should fetch the updates to the existing configuration.
+    /// The collection of audit entries contains audit entries indicating
+    /// the updates to be fetched. This method returns audit entries for
+    /// updated configuration elements of the specific type the
+    /// @c databaseConfigApply should fetch. The returned collection od
+    /// audit entries contains CREATE or UPDATE entries of the specific type.
+    ///
+    /// @param audit_entries collection od audit entries to filter.
+    /// @param object_type object type to filter with.
+    /// @return audit entries collection with CREATE or UPDATE entries
+    /// of the specific type be fetched from the database.
+    db::AuditEntryCollection
+    fetchConfigElement(const db::AuditEntryCollection& audit_entries,
+                       const std::string& object_type) const {
+        db::AuditEntryCollection result;
+        const auto& index = audit_entries.get<db::AuditEntryObjectTypeTag>();
+        auto range = index.equal_range(object_type);
+        for (auto it = range.first; it != range.second; ++it) {
+            if ((*it)->getModificationType() != db::AuditEntry::ModificationType::DELETE) {
+                result.insert(*it);
+            }
+        }
+
+        return (result);
+    }
+
+    /// @brief Server specific method to fetch and apply back end
+    /// configuration into the local configuration.
+    ///
+    /// This pure virtual method must be implemented in the derived classes
+    /// to provide server specific implementation of fetching and applying
+    /// the configuration. The implementations should perform the following
+    /// sequence of operations:
+    /// - Check if any audit entries exist. If none exist, assume that this
+    ///   is the case of full server (re)configuration, otherwise assume
+    ///   that configuration update is being performed.
+    /// - Select audit entries which indicate deletion of any configuration
+    ///   elements. For each such audit entry delete the given object from
+    ///   the local configuration.
+    /// - If the server is performing full reconfiguration, fetch the entire
+    ///   configuration for the server. If the server is merely updating
+    ///   the server configuration, fetch only those objects for which
+    ///   (create/update) audit entries exist.
+    /// - Merge the fetched configuration into the local server's
+    ///   configuration.
+    ///
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param lb_modification_time Lower bound modification time for the
+    /// configuration elements to be fetched.
+    /// @param audit_entries Audit entries fetched from the database since
+    /// the last configuration update. This collection is empty if there
+    /// were no updates.
+    virtual void databaseConfigApply(const db::BackendSelector& backend_selector,
+                                     const db::ServerSelector& server_selector,
+                                     const boost::posix_time::ptime& lb_modification_time,
+                                     const db::AuditEntryCollection& audit_entries) = 0;
+
+    /// @brief Returns the instance of the Config Backend Manager used by
+    /// this object.
+    ///
+    /// @return Reference to the CB Manager instance.
+    ConfigBackendMgrType& getMgr() const {
+        return (ConfigBackendMgrType::instance());
+    }
+
+    /// @brief Convenience method returning initial timestamp to set the
+    /// @c last_audit_revision_time_ to.
+    ///
+    /// @return Returns 2000-Jan-01 00:00:00 in local time.
+    static boost::posix_time::ptime getInitialAuditRevisionTime() {
+        static boost::posix_time::ptime
+            initial_time(boost::gregorian::date(2000, boost::gregorian::Jan, 1));
+        return (initial_time);
+    }
+
+    /// @brief Updates timestamp of the most recent audit entry fetched from
+    /// the database.
+    ///
+    /// If the collection of audit entries is empty, this method simply
+    /// returns without updating the timestamp.
+    ///
+    /// @param audit_entries reference to the collection of the fetched audit entries.
+    void updateLastAuditRevisionTimeId(const db::AuditEntryCollection& audit_entries) {
+        // Do nothing if there are no audit entries. It is the case if
+        // there were no updates to the configuration.
+        if (audit_entries.empty()) {
+            return;
+        }
+
+        // Get the audit entries sorted by modification time and id,
+	// and pick the latest entry.
+        const auto& index = audit_entries.get<db::AuditEntryModificationTimeIdTag>();
+        last_audit_revision_time_ = (*index.rbegin())->getModificationTime();
+        last_audit_revision_id_ = (*index.rbegin())->getRevisionId();
+    }
+
+    /// @brief Stores the most recent audit revision timestamp.
+    boost::posix_time::ptime last_audit_revision_time_;
+
+    /// @brief Stores the most recent audit revision identifier.
+    ///
+    /// The identifier is used when two (or more) audit entries have
+    /// the same timestamp. It is not used by itself because timestamps
+    /// are more user friendly. Unfortunately old versions of MySQL do not
+    /// support millisecond timestamps.
+    uint64_t last_audit_revision_id_;
+};
+
+/// @brief Checks if an object is in a collection od audit entries.
+///
+/// @param audit_entries collection od audit entries to search for.
+/// @param object_id object identifier.
+inline bool
+hasObjectId(const db::AuditEntryCollection& audit_entries,
+            const uint64_t& object_id) {
+    const auto& object_id_idx = audit_entries.get<db::AuditEntryObjectIdTag>();
+    return (object_id_idx.count(object_id) > 0);
+}
+
+} // end of namespace isc::process
+} // end of namespace isc
+
+#endif /* CB_CTL_BASE_H */
diff --git a/src/lib/process/cfgrpt/Makefile.am b/src/lib/process/cfgrpt/Makefile.am
new file mode 100644
index 0000000..8df9629
--- /dev/null
+++ b/src/lib/process/cfgrpt/Makefile.am
@@ -0,0 +1,29 @@
+SUBDIRS = . tests
+
+AM_CPPFLAGS = -I$(top_srcdir)/src/lib -I$(top_builddir)/src/lib
+AM_CXXFLAGS  = $(KEA_CXXFLAGS)
+
+# Get rid of generated message files on a clean
+CLEANFILES = *.gcno *.gcda config_report.cc
+
+# config_report.cc is generated below
+BUILT_SOURCES = config_report.cc
+
+# convenience archive
+noinst_LTLIBRARIES = libcfgrpt.la
+
+nodist_libcfgrpt_la_SOURCES = config_report.cc
+libcfgrpt_la_SOURCES = config_report.h cfgrpt.cc
+
+# set pathname to the input configuration report
+report_file = $(abs_top_builddir)/config.report
+
+# Generate config_report.cc
+config_report.cc: $(report_file)
+	${SHELL} $(top_srcdir)/tools/mk_cfgrpt.sh $(report_file) $(top_builddir)/src/lib/process/cfgrpt/config_report.cc
+
+# Specify the headers for copying into the installation directory tree. The
+# following headers are anticipated to be useful for the user libraries.
+libkea_cfgrpt_includedir = $(pkgincludedir)/cfgrpt
+libkea_cfgrpt_include_HEADERS = \
+	config_report.h
diff --git a/src/lib/process/cfgrpt/Makefile.in b/src/lib/process/cfgrpt/Makefile.in
new file mode 100644
index 0000000..24a3183
--- /dev/null
+++ b/src/lib/process/cfgrpt/Makefile.in
@@ -0,0 +1,930 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
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+	mostlyclean-am
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+	-rm -f ./$(DEPDIR)/config_report.Plo
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+
+# Generate config_report.cc
+config_report.cc: $(report_file)
+	${SHELL} $(top_srcdir)/tools/mk_cfgrpt.sh $(report_file) $(top_builddir)/src/lib/process/cfgrpt/config_report.cc
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/process/cfgrpt/cfgrpt.cc b/src/lib/process/cfgrpt/cfgrpt.cc
new file mode 100644
index 0000000..bf5d40a
--- /dev/null
+++ b/src/lib/process/cfgrpt/cfgrpt.cc
@@ -0,0 +1,34 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <sstream>
+
+#include <process/cfgrpt/config_report.h>
+
+namespace isc {
+namespace detail {
+
+// The config_report array ends with an empty line ("")
+// Each line before this final one starts with four semicolons (;;;;)
+// in order to be easy to extract from binaries.
+std::string
+getConfigReport() {
+    std::stringstream tmp;
+
+    size_t linenum = 0;
+    for (;;) {
+        const char* const line = config_report[linenum++];
+        if (line[0] == '\0')
+            break;
+        tmp << line + 4 << std::endl;
+    }
+    return (tmp.str());
+}
+
+}
+}
diff --git a/src/lib/process/cfgrpt/config_report.h b/src/lib/process/cfgrpt/config_report.h
new file mode 100644
index 0000000..c92f1c1
--- /dev/null
+++ b/src/lib/process/cfgrpt/config_report.h
@@ -0,0 +1,25 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CONFIG_REPORT_H
+#define CONFIG_REPORT_H
+
+#include <string>
+
+namespace isc {
+namespace detail {
+
+extern const char* const config_report[];
+
+// The config_report array ends with an empty line ("")
+// Each line before this final one starts with four semicolons (;;;;)
+// in order to be easy to extract from binaries.
+std::string getConfigReport();
+
+}
+}
+
+#endif // CONFIG_REPORT_H
diff --git a/src/lib/process/cfgrpt/tests/Makefile.am b/src/lib/process/cfgrpt/tests/Makefile.am
new file mode 100644
index 0000000..74bdc43
--- /dev/null
+++ b/src/lib/process/cfgrpt/tests/Makefile.am
@@ -0,0 +1,27 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += run_unittests
+run_unittests_SOURCES = config_report_unittests.cc run_unittests.cc
+
+run_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+run_unittests_LDFLAGS = $(AM_LDFLAGS) $(GTEST_LDFLAGS)
+run_unittests_LDADD  = $(top_builddir)/src/lib/process/cfgrpt/libcfgrpt.la
+run_unittests_LDADD += $(GTEST_LDADD)
+
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/process/cfgrpt/tests/Makefile.in b/src/lib/process/cfgrpt/tests/Makefile.in
new file mode 100644
index 0000000..6f9e5d9
--- /dev/null
+++ b/src/lib/process/cfgrpt/tests/Makefile.in
@@ -0,0 +1,990 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+}
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+      *) echo "am__make_running_with_option: internal error: invalid" \
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+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/process/cfgrpt/tests/config_report_unittests.cc b/src/lib/process/cfgrpt/tests/config_report_unittests.cc
new file mode 100644
index 0000000..b5e8f5b
--- /dev/null
+++ b/src/lib/process/cfgrpt/tests/config_report_unittests.cc
@@ -0,0 +1,27 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <kea_version.h>
+#include <process/cfgrpt/config_report.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace std;
+
+// This test verifies that the getConfigReport() function
+// returns the actual config report.
+TEST(ConfigReportTest, getConfigReport) {
+
+    // Fetch the report string
+    std::string cfgReport = isc::detail::getConfigReport();
+
+    // Verify that it is not empty and does contain the
+    // extended version number
+    ASSERT_FALSE(cfgReport.empty());
+    EXPECT_NE(std::string::npos, cfgReport.find(EXTENDED_VERSION, 0));
+}
diff --git a/src/lib/process/cfgrpt/tests/run_unittests.cc b/src/lib/process/cfgrpt/tests/run_unittests.cc
new file mode 100644
index 0000000..feb0d8e
--- /dev/null
+++ b/src/lib/process/cfgrpt/tests/run_unittests.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/process/config_base.cc b/src/lib/process/config_base.cc
new file mode 100644
index 0000000..1e02fad
--- /dev/null
+++ b/src/lib/process/config_base.cc
@@ -0,0 +1,143 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+#include <log/logger_specification.h>
+#include <process/config_base.h>
+
+#include <list>
+
+using namespace isc::log;
+using namespace isc::data;
+
+namespace isc {
+namespace process {
+
+void
+ConfigBase::applyLoggingCfg() const {
+    std::list<LoggerSpecification> specs;
+    for (LoggingInfo const& logging_info : logging_info_) {
+        if (logging_info.name_ == getRootLoggerName()) {
+            // Root logger has to be processed first if we expect child loggers
+            // to inherit configuration from it.
+            specs.push_front(logging_info.toSpec());
+        } else {
+            specs.push_back(logging_info.toSpec());
+        }
+    }
+    LoggerManager manager;
+    manager.process(specs.begin(), specs.end());
+}
+
+bool
+ConfigBase::equals(const ConfigBase& other) const {
+    // If number of loggers is different, then configurations aren't equal.
+    if (logging_info_.size() != other.logging_info_.size()) {
+        return (false);
+    }
+    // Pass through all loggers and try to find the match for each of them
+    // with the loggers from the other configuration. The order doesn't
+    // matter so we can't simply compare the vectors.
+    for (LoggingInfoStorage::const_iterator this_it =
+             logging_info_.begin(); this_it != logging_info_.end();
+         ++this_it) {
+        bool match = false;
+        for (LoggingInfoStorage::const_iterator other_it =
+                 other.logging_info_.begin();
+             other_it != other.logging_info_.end(); ++other_it) {
+            if (this_it->equals(*other_it)) {
+                match = true;
+                break;
+            }
+        }
+        // No match found for the particular logger so return false.
+        if (!match) {
+            return (false);
+        }
+    }
+
+    // Check config control info for equality.
+    if ((config_ctl_info_ && !other.config_ctl_info_) ||
+        (!config_ctl_info_ && other.config_ctl_info_) ||
+        ((config_ctl_info_ && other.config_ctl_info_) &&
+         (!config_ctl_info_->equals(*(other.config_ctl_info_))))) {
+        return (false);
+    }
+
+    return (true);
+}
+
+void
+ConfigBase::copy(ConfigBase& other) const {
+    // We will entirely replace loggers in the new configuration.
+    other.logging_info_.clear();
+    for (LoggingInfoStorage::const_iterator it = logging_info_.begin();
+         it != logging_info_.end(); ++it) {
+        other.addLoggingInfo(*it);
+    }
+
+    // Clone the config control info
+    if (config_ctl_info_) {
+        other.config_ctl_info_.reset(new ConfigControlInfo(*config_ctl_info_));
+    } else {
+        other.config_ctl_info_.reset();
+    }
+
+    // Clone server tag.
+    other.server_tag_ = server_tag_;
+}
+
+void
+ConfigBase::merge(ConfigBase& other) {
+    // Merge logging info.
+    if (!other.logging_info_.empty()) {
+        logging_info_ = other.logging_info_;
+    }
+
+    // Merge the config control info
+    if (other.config_ctl_info_) {
+        if (config_ctl_info_) {
+            config_ctl_info_->merge(*other.config_ctl_info_);
+        } else {
+            config_ctl_info_ = other.config_ctl_info_;
+        }
+    }
+
+    // Merge server tag.
+    if (!other.server_tag_.unspecified()) {
+        server_tag_ = other.server_tag_.get();
+    }
+}
+
+ElementPtr
+ConfigBase::toElement() const {
+    ElementPtr result = Element::createMap();
+
+    // Was in the Logging global map.
+    if (!logging_info_.empty()) {
+        // Set loggers list
+        ElementPtr loggers = Element::createList();
+        for (LoggingInfoStorage::const_iterator logger =
+                 logging_info_.cbegin();
+             logger != logging_info_.cend(); ++logger) {
+            loggers->add(logger->toElement());
+        }
+        result->set("loggers", loggers);
+    }
+
+    // server-tag
+    if (!server_tag_.unspecified()) {
+        result->set("server-tag", Element::create(server_tag_.get()));
+    }
+
+    return (result);
+}
+
+}  // namespace process
+}  // namespace isc
diff --git a/src/lib/process/config_base.h b/src/lib/process/config_base.h
new file mode 100644
index 0000000..1a99d4c
--- /dev/null
+++ b/src/lib/process/config_base.h
@@ -0,0 +1,181 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CONFIG_BASE_H
+#define CONFIG_BASE_H
+
+#include <cc/cfg_to_element.h>
+#include <cc/user_context.h>
+#include <process/config_ctl_info.h>
+#include <process/logging_info.h>
+#include <util/optional.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+namespace isc {
+namespace process {
+
+/// @brief Base class for all configurations
+///
+/// This is a common base class that represents configurations.
+/// SrvConfig, D2CfgContext, CtrlAgentCfgContext and possibly other
+/// classes holding configurations are derived from this.
+///
+/// It should contain only those elements that are applicable to really
+/// every daemon we may have. Before adding anything here, please consider
+/// whether it would be usable by all of the following: DHCP servers,
+/// DDNS update daemon, Control Agent, Netconf daemon, DHCP relay,
+/// DHCP client.
+///
+/// This class currently holds information about common server configuration.
+class ConfigBase : public isc::data::UserContext, public isc::data::CfgToElement {
+public:
+    /// @name Modifiers and accesors for the configuration objects.
+    ///
+    /// @warning References to the objects returned by accessors are only
+    /// valid during the lifetime of the @c ConfigBase object which
+    /// returned them.
+    ///
+    //@{
+    /// @brief Returns logging specific configuration.
+    const process::LoggingInfoStorage& getLoggingInfo() const {
+        return (logging_info_);
+    }
+
+    /// @brief Sets logging specific configuration.
+    ///
+    /// @param logging_info New logging configuration.
+    void addLoggingInfo(const process::LoggingInfo& logging_info) {
+        logging_info_.push_back(logging_info);
+    }
+
+    /// @brief Apply logging configuration to log4cplus.
+    void applyLoggingCfg() const;
+
+    /// @brief Compares two configuration.
+    ///
+    /// @param other the other configuration to compare to
+    bool equals(const ConfigBase& other) const;
+
+    /// @brief Merges specified configuration into this configuration.
+    ///
+    /// This method merges logging and config control configuration into
+    /// this configuration. The new logging configuration replaces the
+    /// existing configuration if the new logging configuration is
+    /// non-empty. The new config control configuration replaces the
+    /// existing configuration if the new logging configuration is
+    /// non-null and non-empty.
+    ///
+    /// @warning The call to @c merge may modify the data in the @c other
+    /// object. Therefore, the caller must not rely on the data held
+    /// in the @c other object after the call to @c merge. Also, the
+    /// data held in @c other must not be modified after the call to
+    /// @c merge because it may affect the merged configuration.
+    ///
+    /// If a derivation of this class implements the @c merge method
+    /// it should call @c ConfigBase::merge.
+    ///
+    /// @param other the other configuration to be merged into this
+    /// configuration.
+    virtual void merge(ConfigBase& other);
+
+    /// @brief Converts to Element representation
+    ///
+    /// This creates a Map element with the following content (expressed
+    /// as JSON):
+    /// {{{
+    /// {
+    ///     "Server": {
+    ///         :
+    ///     }
+    /// }
+    /// }}}
+    ///
+    /// Note that it will not contain the configuration control information
+    /// (i.e. "config-control"), as this is not a top-level element, rather
+    /// it belongs within the configured process element.
+    ///
+    /// @return Element representation.
+    virtual isc::data::ElementPtr toElement() const;
+
+    /// @brief Fetches a read-only copy of the configuration control
+    /// information
+    /// @return pointer to the const ConfigControlInfo
+    process::ConstConfigControlInfoPtr getConfigControlInfo() const {
+        return (config_ctl_info_);
+    }
+
+    /// @brief Set the configuration control information
+    ///
+    /// Updates the internal pointer to the configuration control
+    /// information with the given pointer value.  If the given pointer
+    /// is empty, the internal pointer will be reset.
+    ///
+    /// @param config_ctl_info pointer to the configuration value
+    /// to store.
+    void setConfigControlInfo(const process::ConfigControlInfoPtr&
+                              config_ctl_info) {
+        config_ctl_info_ = config_ctl_info;
+    }
+
+    /// @brief Sets the server's logical name
+    ///
+    /// @param server_tag a unique string name which identifies this server
+    /// from any other configured servers
+    void setServerTag(const util::Optional<std::string>& server_tag) {
+        server_tag_ = server_tag;
+    }
+
+    /// @brief Returns the server's logical name
+    ///
+    /// @return string containing the server's tag
+    util::Optional<std::string> getServerTag() const {
+        return (server_tag_);
+    }
+
+    /// @brief Returns the last commit timestamp.
+    /// @return the last commit timestamp.
+    boost::posix_time::ptime getLastCommitTime() const {
+        return (last_commit_time_);
+    }
+
+    /// @brief Sets the last commit timestamp.
+    /// @param last_commit_time last commit timestamp.
+    void setLastCommitTime(const boost::posix_time::ptime& last_commit_time) {
+        last_commit_time_ = last_commit_time;
+    }
+
+protected:
+    /// @brief Copies the current configuration to a new configuration.
+    ///
+    /// This method copies only the parameters defined in this class.
+    /// Since derived classes are expected to provide their own
+    /// copy methods, this one is protected and can be used only
+    /// by descendant classes.
+    ///
+    /// @param new_config this configuration will be copied to new_config
+    void copy(ConfigBase& new_config) const;
+
+private:
+    /// @brief Logging specific information.
+    process::LoggingInfoStorage logging_info_;
+
+    /// @brief Configuration control information.
+    process::ConfigControlInfoPtr config_ctl_info_;
+
+    /// @brief Logical name of the server
+    util::Optional<std::string> server_tag_;
+
+    /// @brief Stores the last commit timestamp.
+    boost::posix_time::ptime last_commit_time_;
+};
+
+/// @brief Non-const pointer to the @c ConfigBase.
+typedef boost::shared_ptr<ConfigBase> ConfigPtr;
+
+};
+};
+
+#endif /* CONFIG_BASE_H */
diff --git a/src/lib/process/config_ctl_info.cc b/src/lib/process/config_ctl_info.cc
new file mode 100644
index 0000000..5c6aca7
--- /dev/null
+++ b/src/lib/process/config_ctl_info.cc
@@ -0,0 +1,130 @@
+// Copyright (C) 2018-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <process/config_ctl_info.h>
+
+using namespace isc::data;
+using namespace isc::util;
+
+namespace isc {
+namespace process {
+
+void
+ConfigDbInfo::setAccessString(const std::string& access_str, bool test_mode) {
+    access_str_ = access_str;
+    access_params_.clear();
+    if (!test_mode) {
+        access_params_ = db::DatabaseConnection::parse(access_str_);
+    }
+}
+
+bool
+ConfigDbInfo::equals(const ConfigDbInfo& other) const {
+    return (access_params_ == other.access_params_);
+}
+
+isc::data::ElementPtr
+ConfigDbInfo::toElement() const {
+    return (isc::db::DatabaseConnection::toElementDbAccessString(access_str_));
+}
+
+bool
+ConfigDbInfo::getParameterValue(const std::string& name, std::string& value) const {
+    auto param = access_params_.find(name);
+    if (param == access_params_.end()) {
+        return (false);
+    }
+
+    value = param->second;
+    return (true);
+}
+
+//******** ConfigControlInfo ********//
+
+ConfigControlInfo::ConfigControlInfo(const ConfigControlInfo& other)
+    : config_fetch_wait_time_(other.config_fetch_wait_time_) {
+    for (auto db : other.db_infos_) {
+        addConfigDatabase(db.getAccessString());
+    }
+}
+
+void
+ConfigControlInfo::addConfigDatabase(const std::string& access_str) {
+    ConfigDbInfo new_db;
+    new_db.setAccessString(access_str);
+
+    for (auto db : db_infos_) {
+        if (new_db == db) {
+            // we have a duplicate!
+            isc_throw(BadValue, "database with access parameters: "
+                      << access_str << " already exists");
+        }
+    }
+
+    db_infos_.push_back(new_db);
+}
+
+const ConfigDbInfo&
+ConfigControlInfo::findConfigDb(const std::string& param_name,
+                                const std::string& param_value) {
+    for (ConfigDbInfoList::iterator db = db_infos_.begin();
+         db != db_infos_.end(); ++db) {
+        std::string db_value;
+        if (db->getParameterValue(param_name, db_value) &&
+            (param_value == db_value)) {
+                return (*db);
+            }
+    }
+
+    return (EMPTY_DB());
+}
+
+const ConfigDbInfo&
+ConfigControlInfo::EMPTY_DB() {
+    static ConfigDbInfo empty;
+    return (empty);
+}
+
+void
+ConfigControlInfo::clear() {
+    db_infos_.clear();
+    config_fetch_wait_time_ = Optional<uint16_t>(30, true);
+}
+
+void
+ConfigControlInfo::merge(const ConfigControlInfo& other) {
+    if (!other.db_infos_.empty()) {
+        db_infos_ = other.db_infos_;
+    }
+}
+
+ElementPtr
+ConfigControlInfo::toElement() const {
+    ElementPtr result = Element::createMap();
+    ElementPtr db_list = Element::createList();
+    for (auto db_info : db_infos_) {
+        db_list->add(db_info.toElement());
+    }
+
+    result->set("config-databases", db_list);
+
+    if (!config_fetch_wait_time_.unspecified()) {
+        result->set("config-fetch-wait-time",
+                    Element::create(static_cast<int>(config_fetch_wait_time_)));
+    }
+
+    return (result);
+}
+
+bool
+ConfigControlInfo::equals(const ConfigControlInfo& other) const {
+    return ((db_infos_ == other.db_infos_) &&
+            (config_fetch_wait_time_.get() == other.config_fetch_wait_time_.get()));
+}
+
+} // end of namespace isc::process
+} // end of namespace isc
diff --git a/src/lib/process/config_ctl_info.h b/src/lib/process/config_ctl_info.h
new file mode 100644
index 0000000..a4fbedb
--- /dev/null
+++ b/src/lib/process/config_ctl_info.h
@@ -0,0 +1,247 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PROCESS_CONFIG_CTL_INFO_H
+#define PROCESS_CONFIG_CTL_INFO_H
+
+#include <cc/cfg_to_element.h>
+#include <database/database_connection.h>
+#include <util/optional.h>
+
+#include <boost/shared_ptr.hpp>
+#include <stdint.h>
+#include <vector>
+
+namespace isc {
+namespace process {
+
+/// @brief Provides configuration information used during a server's
+/// configuration process.
+///
+class ConfigDbInfo : public isc::data::CfgToElement {
+public:
+    /// @brief Constructor
+    ConfigDbInfo() {};
+
+    /// @brief Set the access string.
+    ///
+    /// Sets the db's access string to the given value and then parses it
+    /// into name-value pairs and storing them internally as a
+    /// DatabaseConnection::ParameterMap.  It discards the existing content
+    /// of the map first.  It does not validate the parameter names of values,
+    /// ensuring the validity of the string content is placed upon the caller.
+    ///
+    /// @param access_str string of name=value pairs separated by spaces.
+    /// @param test_mode flag used in unittests only to skip parsing the access
+    /// string and storing the parameters.
+    void setAccessString(const std::string& access_str, bool test_mode = false);
+
+    /// @brief Retrieves the database access string.
+    ///
+    /// @return database access string.
+    std::string getAccessString() const {
+        return (access_str_);
+    }
+
+    /// @brief Retrieves the database access string with password redacted.
+    ///
+    /// @return database access string with password redacted.
+    std::string redactedAccessString() const {
+        return (db::DatabaseConnection::redactedAccessString(access_params_));
+    }
+
+    /// @brief Retrieve the map of parameter values.
+    ///
+    /// @return Constant reference to the database's parameter map.
+    const db::DatabaseConnection::ParameterMap& getParameters() const {
+        return (access_params_);
+    }
+
+    /// @brief Fetch the value of a given parameter.
+    ///
+    /// @param name name of the parameter value to fetch.
+    /// @param[out] value string which will contain the value of the
+    /// parameter (if found).
+    ///
+    /// @return Boolean true if the parameter named is found in the map,
+    /// false otherwise.
+    bool getParameterValue(const std::string& name,
+                           std::string& value) const;
+
+    /// @brief Unparse a configuration object.
+    ///
+    /// @return a pointer to unparsed configuration.
+    virtual isc::data::ElementPtr toElement() const;
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool equals(const ConfigDbInfo& other) const;
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool operator==(const ConfigDbInfo& other) const {
+        return (equals(other));
+    }
+
+    /// @brief Compares two objects for inequality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are not equal, false otherwise.
+    bool operator!=(const ConfigDbInfo& other) const {
+        return (!equals(other));
+    }
+
+private:
+    /// @brief Access string of parameters used to access this database.
+    std::string access_str_;
+
+    /// @brief Map of the access parameters and their values.
+    db::DatabaseConnection::ParameterMap access_params_;
+};
+
+typedef std::vector<ConfigDbInfo> ConfigDbInfoList;
+
+/// @brief Embodies configuration information used during a server's
+/// configuration process.
+///
+/// This is class conveys the configuration control information
+/// described by the following JSON text:
+///
+/// @code
+/// "config-control" :
+/// {
+///     "config-databases":
+///     [
+///     {
+///         # first config db
+///         # common database access parameters
+///         "type": <"mysql"|"postgresql">,
+///         "name": <"db name">,
+///         "host": <"db host name">,
+///             :
+///     },
+///     {
+///         # next config db
+///     }
+///     ]
+///
+/// }
+/// @endcode
+///
+class ConfigControlInfo : public isc::data::CfgToElement {
+public:
+
+    /// @brief Constructor.
+    ConfigControlInfo()
+        : config_fetch_wait_time_(30, true) {};
+
+    /// @brief Copy Constructor.
+    ConfigControlInfo(const ConfigControlInfo& other);
+
+    /// @brief Sets new value of the config-fetch-wait-time.
+    ///
+    /// @param config_fetch_wait_time New value of the parameter which
+    /// specifies a time period in seconds between the attempts to
+    /// fetch the server configuration updates. The value of 0 disables
+    /// the periodic attempts to fetch the updates.
+    void setConfigFetchWaitTime(const util::Optional<uint16_t>& config_fetch_wait_time) {
+        config_fetch_wait_time_ = config_fetch_wait_time;
+    }
+
+    /// @brief Returns configured config-fetch-wait-time value.
+    ///
+    /// This value specifies the time period in seconds between the
+    /// attempts to fetch the server configuration updates via the
+    /// configuration backends. The value of 0 means that the
+    /// mechanism to periodically fetch the configuration updates
+    /// is disabled.
+    ///
+    /// @return Time period between the subsequent attempts to
+    /// fetch server configuration updates in seconds.
+    const util::Optional<uint16_t>& getConfigFetchWaitTime() const {
+        return (config_fetch_wait_time_);
+    }
+
+    /// @brief Sets configuration database access string.
+    ///
+    /// @param access_str database access string.
+    ///
+    /// @throw BadValue if an entry exists that matches the parameters
+    /// in the given access string, or if the access string is invalid.
+    void addConfigDatabase(const std::string& access_str);
+
+    /// @brief Retrieves the list of databases.
+    ///
+    /// The entries in the list are stored in the order they were
+    /// added to it (FIFO).
+    ///
+    /// @return a reference to a const list of databases.
+    const ConfigDbInfoList& getConfigDatabases() const {
+        return (db_infos_);
+    }
+
+    /// @brief Retrieves the database with the given access parameter value.
+    ///
+    /// @return A reference to the matching database or the not-found value
+    /// available via @c EMPTY_DB().
+    const ConfigDbInfo& findConfigDb(const std::string& param_name,
+                                     const std::string& param_value);
+
+    /// @brief Empties the contents of the class, including the database list.
+    void clear();
+
+    /// @brief Merges specified configuration into this configuration.
+    ///
+    /// If the other configuration is non-empty it completely replaces
+    /// this configuration.
+    ///
+    /// @param other the other configuration to be merged into this
+    /// configuration.
+    void merge(const ConfigControlInfo& other);
+
+    /// @brief Unparse a configuration object.
+    ///
+    /// @return a pointer to unparsed configuration.
+    virtual isc::data::ElementPtr toElement() const;
+
+    /// @brief Fetches the not-found value returned by database list searches.
+    ///
+    /// @return a reference to the empty ConfigDBInfo.
+    static const ConfigDbInfo& EMPTY_DB();
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool equals(const ConfigControlInfo& other) const;
+
+private:
+
+    /// @brief Configured value of the config-fetch-wait-time.
+    util::Optional<uint16_t> config_fetch_wait_time_;
+
+    /// @brief List of configuration databases.
+    ConfigDbInfoList db_infos_;
+};
+
+/// @brief Defines a pointer to a ConfigControlInfo.
+typedef boost::shared_ptr<ConfigControlInfo> ConfigControlInfoPtr;
+
+/// @brief Defines a pointer to a const ConfigControlInfo.
+typedef boost::shared_ptr<const ConfigControlInfo> ConstConfigControlInfoPtr;
+
+} // namespace process
+} // end namespace isc
+
+#endif // PROCESS_CONFIG_CTL_INFO_H
diff --git a/src/lib/process/config_ctl_parser.cc b/src/lib/process/config_ctl_parser.cc
new file mode 100644
index 0000000..38f7ac0
--- /dev/null
+++ b/src/lib/process/config_ctl_parser.cc
@@ -0,0 +1,66 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/dhcp_config_error.h>
+#include <process/config_ctl_parser.h>
+#include <database/dbaccess_parser.h>
+#include <cstdint>
+#include <string>
+
+using namespace isc;
+using namespace isc::data;
+
+namespace isc {
+namespace process {
+
+ConfigControlInfoPtr
+ConfigControlParser::parse(const data::ConstElementPtr& config_control) {
+    ConfigControlInfoPtr ctl_info(new ConfigControlInfo());
+
+    try {
+        if (config_control->contains("config-databases")) {
+
+            auto elem = config_control->get("config-databases");
+            if (elem->getType() != Element::list) {
+                isc_throw (ConfigError, "config-databases must be a list ("
+                           << elem->getPosition() << ")");
+            }
+
+            const std::vector<data::ElementPtr>& db_list = elem->listValue();
+            for (auto db = db_list.cbegin(); db != db_list.end(); ++db) {
+                db::DbAccessParser parser;
+                std::string access_string;
+                parser.parse(access_string, *db);
+                /// @todo do we still need access_string for this at all?
+                /// can't we just use params directly and get rid of the
+                /// string now that DatabaseConnection::toElement(map) exists?
+                ctl_info->addConfigDatabase(access_string);
+            }
+        }
+
+        if (config_control->contains("config-fetch-wait-time")) {
+            auto config_fetch_wait_time = getInteger(config_control,
+                                                     "config-fetch-wait-time",
+                                                     0, 65535);
+            ctl_info->setConfigFetchWaitTime(static_cast<uint16_t>(config_fetch_wait_time));
+        }
+
+    } catch (const isc::ConfigError&) {
+        // Position was already added
+        throw;
+    } catch (const std::exception& ex) {
+        isc_throw(ConfigError, ex.what() << " ("
+                  << config_control->getPosition() << ")");
+    }
+
+    return (ctl_info);
+}
+
+} // end of namespace isc::process
+} // end of namespace isc
+
diff --git a/src/lib/process/config_ctl_parser.h b/src/lib/process/config_ctl_parser.h
new file mode 100644
index 0000000..4182a19
--- /dev/null
+++ b/src/lib/process/config_ctl_parser.h
@@ -0,0 +1,35 @@
+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef PROCESS_CONFIG_CONTROL_PARSER_H
+#define PROCESS_CONFIG_CONTROL_PARSER_H
+
+#include <cc/data.h>
+#include <cc/simple_parser.h>
+#include <process/config_ctl_info.h>
+
+namespace isc {
+namespace process {
+
+/// @brief Implements parser for config control information, "config-control"
+class ConfigControlParser : isc::data::SimpleParser {
+public:
+
+    /// @brief Parses a configuration control Element
+    ///
+    /// @param config_control Element holding the config control content
+    /// to be parsed.
+    ///
+    /// @return Pointer to newly created ConfigControlInfo instance
+    /// @throw DhcpConfigError when config control content is invalid.
+    ConfigControlInfoPtr
+    parse(const data::ConstElementPtr& config_control);
+};
+
+} // enf of namespace isc::process
+} // end of namespace isc
+
+#endif // PROCESS_CONFIG_CONTROL_PARSER_H
diff --git a/src/lib/process/d_cfg_mgr.cc b/src/lib/process/d_cfg_mgr.cc
new file mode 100644
index 0000000..a08a903
--- /dev/null
+++ b/src/lib/process/d_cfg_mgr.cc
@@ -0,0 +1,164 @@
+// Copyright (C) 2013-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/command_interpreter.h>
+#include <dhcp/libdhcp++.h>
+#include <process/d_log.h>
+#include <process/d_cfg_mgr.h>
+#include <process/daemon.h>
+#include <process/redact_config.h>
+#include <util/encode/hex.h>
+#include <util/strutil.h>
+
+#include <boost/foreach.hpp>
+#include <boost/lexical_cast.hpp>
+#include <boost/algorithm/string.hpp>
+
+#include <limits>
+#include <iostream>
+#include <vector>
+#include <map>
+
+using namespace std;
+using namespace isc;
+using namespace isc::config;
+using namespace isc::dhcp;
+using namespace isc::data;
+using namespace isc::asiolink;
+
+namespace isc {
+namespace process {
+
+// *********************** DCfgMgrBase  *************************
+
+DCfgMgrBase::DCfgMgrBase(ConfigPtr context) {
+    setContext(context);
+}
+
+DCfgMgrBase::~DCfgMgrBase() {
+}
+
+void
+DCfgMgrBase::resetContext() {
+    ConfigPtr context = createNewContext();
+    setContext(context);
+}
+
+void
+DCfgMgrBase::setContext(ConfigPtr& context) {
+    if (!context) {
+        isc_throw(DCfgMgrBaseError, "DCfgMgrBase: context cannot be NULL");
+    }
+
+    context_ = context;
+}
+
+ConstElementPtr
+DCfgMgrBase::redactConfig(ConstElementPtr const& config) const {
+    ConstElementPtr result(config);
+    for (std::list<std::string>& json_path : jsonPathsToRedact()) {
+        result = isc::process::redactConfig(result, json_path);
+    }
+    return result;
+}
+
+list<list<string>> DCfgMgrBase::jsonPathsToRedact() const {
+    static list<list<string>> const list;
+    return list;
+}
+
+isc::data::ConstElementPtr
+DCfgMgrBase::simpleParseConfig(isc::data::ConstElementPtr config_set,
+                               bool check_only,
+                               const std::function<void()>& post_config_cb) {
+    if (!config_set) {
+        return (isc::config::createAnswer(CONTROL_RESULT_ERROR,
+                                          std::string("Can't parse NULL config")));
+    }
+    LOG_DEBUG(dctl_logger, isc::log::DBGLVL_COMMAND, DCTL_CONFIG_START)
+        .arg(redactConfig(config_set)->str());
+
+    // The parsers implement data inheritance by directly accessing
+    // configuration context. For this reason the data parsers must store
+    // the parsed data into context immediately. This may cause data
+    // inconsistency if the parsing operation fails after the context has been
+    // modified. We need to preserve the original context here
+    // so as we can rollback changes when an error occurs.
+    ConfigPtr original_context = context_;
+    resetContext();
+    bool rollback = false;
+
+    // Answer will hold the result returned to the caller.
+    ConstElementPtr answer;
+
+    try {
+        // Logging is common so factor it.
+        Daemon::configureLogger(config_set, context_);
+
+        // Let's call the actual implementation
+        answer = parse(config_set, check_only);
+
+        // and check the response returned.
+        int code = 0;
+        isc::config::parseAnswer(code, answer);
+
+        // Everything was fine. Configuration set processed successfully.
+        if (!check_only) {
+            if (code == 0) {
+                // Call the callback only when parsing was successful.
+                if (post_config_cb) {
+                    post_config_cb();
+                }
+                LOG_INFO(dctl_logger, DCTL_CONFIG_COMPLETE).arg(getConfigSummary(0));
+                // Set the last commit timestamp.
+                auto now = boost::posix_time::second_clock::universal_time();
+                context_->setLastCommitTime(now);
+            } else {
+                rollback = true;
+            }
+
+            // Use the answer provided.
+            //answer = isc::config::createAnswer(CONTROL_RESULT_SUCCESS, "Configuration committed.");
+        } else {
+            LOG_INFO(dctl_logger, DCTL_CONFIG_CHECK_COMPLETE)
+                .arg(getConfigSummary(0))
+                .arg(config::answerToText(answer));
+        }
+
+    } catch (const std::exception& ex) {
+        LOG_ERROR(dctl_logger, DCTL_PARSER_FAIL).arg(ex.what());
+        answer = isc::config::createAnswer(CONTROL_RESULT_ERROR, ex.what());
+        rollback = true;
+    }
+
+    if (check_only) {
+        // If this is a configuration check only, then don't actually apply
+        // the configuration and reverse to the previous one.
+        context_ = original_context;
+    }
+
+    if (rollback) {
+        // An error occurred, so make sure that we restore original context.
+        context_ = original_context;
+    }
+
+    return (answer);
+}
+
+
+void
+DCfgMgrBase::setCfgDefaults(isc::data::ElementPtr) {
+}
+
+isc::data::ConstElementPtr
+DCfgMgrBase::parse(isc::data::ConstElementPtr, bool) {
+    isc_throw(DCfgMgrBaseError, "This class does not implement simple parser paradigm yet");
+}
+
+} // end of isc::dhcp namespace
+} // end of isc namespace
diff --git a/src/lib/process/d_cfg_mgr.h b/src/lib/process/d_cfg_mgr.h
new file mode 100644
index 0000000..204f7b2
--- /dev/null
+++ b/src/lib/process/d_cfg_mgr.h
@@ -0,0 +1,252 @@
+// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D_CFG_MGR_H
+#define D_CFG_MGR_H
+
+#include <cc/data.h>
+#include <cc/cfg_to_element.h>
+#include <cc/user_context.h>
+#include <process/config_base.h>
+#include <exceptions/exceptions.h>
+
+#include <stdint.h>
+
+#include <functional>
+#include <list>
+#include <string>
+
+namespace isc {
+namespace process {
+
+/// @brief Defines a map of ConstElementPtrs keyed by name
+typedef std::map<std::string, isc::data::ConstElementPtr> ElementMap;
+
+/// @brief Exception thrown if the configuration manager encounters an error.
+class DCfgMgrBaseError : public isc::Exception {
+public:
+    DCfgMgrBaseError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Configuration Manager
+///
+/// DCfgMgrBase is an abstract class that provides the mechanisms for managing
+/// an application's configuration.  This includes services for parsing sets of
+/// configuration values, storing the parsed information in its converted form,
+/// and retrieving the information on demand.  It is intended to be the worker
+/// class which is handed a set of configuration values to process by upper
+/// application management layers.
+///
+/// This class allows two configuration methods:
+///
+/// 1. classic method
+///
+/// The class presents a public method for receiving new configurations,
+/// parseConfig.  This method coordinates the parsing effort as follows:
+///
+/// @code
+///    make backup copy of configuration context
+///    Split top-level configuration elements into to sets:
+///      1. Set of scalar elements (strings, booleans, ints, etc..)
+///      2. Set of object elements (maps, lists, etc...)
+///    For each entry in the scalar set:
+///        get derivation-specific parser for element
+///        run parser
+///        update context with parsed results
+///        break on error
+///
+///    For each entry in the object set;
+///        get derivation-specific parser for element
+///        run parser
+///        update context with parsed results
+///        break on error
+///
+///    if an error occurred or this is only a check
+///        restore configuration context from backup
+/// @endcode
+///
+/// The above structuring ensures that global parameters are parsed first
+/// making them available during subsequent object element parsing. The order
+/// in which the object elements are processed is either:
+///
+///    1. Natural order presented by the configuration set
+///    2. Specific order determined by a list of element ids
+///
+/// This allows a derivation to specify the order in which its elements are
+/// parsed if there are dependencies between elements.
+///
+/// To parse a given element, its id along with the element itself,
+/// is passed into the virtual method, @c parseElement. Derivations are
+/// expected to converts the element into application specific object(s),
+/// thereby isolating the CPL from application details.
+///
+/// In the event that an error occurs, parsing is halted and the
+/// configuration context is restored from backup.
+///
+/// See @ref isc::d2::D2CfgMgr and @ref isc::d2::D2Process for example use of
+/// this approach.
+///
+/// 2. simple configuration method
+///
+/// This approach assumes usage of @ref isc::data::SimpleParser paradigm. It
+/// does not use any intermediate storage, does not use parser pointers, does
+/// not enforce parsing order.
+///
+/// Here's the expected control flow order:
+/// 1. implementation calls simpleParseConfig from its configure method.
+/// 2. simpleParseConfig makes a configuration context
+/// 3. parse method from the derived class is called
+/// 4. if the configuration was unsuccessful or this is only a check, the
+///    old context is reinstantiated. If not, the configuration is kept.
+///
+/// See @ref isc::agent::CtrlAgentCfgMgr and @ref isc::agent::CtrlAgentProcess
+/// for example use of this approach.
+class DCfgMgrBase {
+public:
+    /// @brief Constructor
+    ///
+    /// @param context is a pointer to the configuration context the manager
+    /// will use for storing parsed results.
+    ///
+    /// @throw throws DCfgMgrBaseError if context is null
+    DCfgMgrBase(ConfigPtr context);
+
+    /// @brief Destructor
+    virtual ~DCfgMgrBase();
+
+    /// @brief Acts as the receiver of new configurations.
+    ///
+    /// This method is similar to what parseConfig did, execept it employs
+    /// the simple parser paradigm: no intermediate storage, no parser pointers
+    /// no distinction between params_map and objects_map, parse order (if needed)
+    /// can be enforced in the actual implementation by calling specific
+    /// parsers first. See @ref isc::agent::CtrlAgentCfgMgr::parse for example.
+    ///
+    /// If check_only is true, the actual parsing is done to check if the configuration
+    /// is sane, but is then reverted.
+    ///
+    /// @param config set of configuration elements to be parsed
+    /// @param check_only true if the config is to be checked only, but not applied
+    /// @param post_config_cb Callback to be executed after the usual parsing stage.
+    /// This can be specified as a C++ lambda which configures other parts of the
+    /// system based on the parsed configuration information. The callback should
+    /// throw an exception to signal an error. This method will catch this
+    /// exception and place an exception string within the result returned.
+    ///
+    /// @return an Element that contains the results of configuration composed
+    /// of an integer status value (0 means successful, non-zero means failure),
+    /// and a string explanation of the outcome.
+    isc::data::ConstElementPtr
+    simpleParseConfig(isc::data::ConstElementPtr config,
+                      bool check_only = false,
+                      const std::function<void()>& post_config_cb = nullptr);
+
+    /// @brief Fetches the configuration context.
+    ///
+    /// @return returns a pointer reference to the configuration context.
+    ConfigPtr& getContext() {
+        return (context_);
+    }
+
+    /// @brief Returns configuration summary in the textual format.
+    ///
+    /// This method returns the brief text describing the current configuration.
+    /// It may be used for logging purposes, e.g. whn the new configuration is
+    /// committed to notify a user about the changes in configuration.
+    ///
+    /// @param selection Bitfield which describes the parts of the configuration
+    /// to be returned.
+    ///
+    /// @return Summary of the configuration in the textual format.
+    virtual std::string getConfigSummary(const uint32_t selection) = 0;
+
+    /// @brief Redact the configuration.
+    ///
+    /// This method replaces passwords and secrets by asterisks. By
+    /// default it follows all subtrees at the exception of user
+    /// contexts. Please derive the method to allow a reasonable
+    /// performance by following only subtrees where the syntax allows
+    /// the presence of passwords and secrets.
+    ///
+    /// @param config the Element tree structure that describes the configuration.
+    /// @return unmodified config or a copy of the config where passwords were
+    /// replaced by asterisks so can be safely logged to an unprivileged place.
+    isc::data::ConstElementPtr
+    redactConfig(isc::data::ConstElementPtr const& config) const;
+
+protected:
+    /// @brief Adds default values to the given config
+    ///
+    /// Provides derivations a means to add defaults to a configuration
+    /// Element map prior to parsing it.
+    ///
+    /// @param mutable_config - configuration to which defaults should be added
+    virtual void setCfgDefaults(isc::data::ElementPtr mutable_config);
+
+    /// @brief Abstract factory which creates a context instance.
+    ///
+    /// This method is used at the beginning of configuration process to
+    /// create a fresh, empty copy of the derivation-specific context. This
+    /// new context will be populated during the configuration process
+    /// and will replace the existing context provided the configuration
+    /// process completes without error.
+    ///
+    /// @return Returns a ConfigPtr to the new context instance.
+    virtual ConfigPtr createNewContext() = 0;
+
+    /// @brief Replaces existing context with a new, empty context.
+    void resetContext();
+
+    /// @brief Update the current context.
+    ///
+    /// Replaces the existing context with the given context.
+    /// @param context Pointer to the new context.
+    /// @throw DCfgMgrBaseError if context is NULL.
+    void setContext(ConfigPtr& context);
+
+    /// @brief Parses actual configuration.
+    ///
+    /// This method is expected to be implemented in derived classes that employ
+    /// SimpleParser paradigm (i.e. they call simpleParseConfig rather than
+    /// parseConfig from their configure method).
+    ///
+    /// Implementations that do not employ this method may provide dummy
+    /// implementation.
+    ///
+    /// @param config the Element tree structure that describes the configuration.
+    /// @param check_only false for normal configuration, true when verifying only
+    ///
+    /// @return an Element that contains the results of configuration composed
+    /// of an integer status value (0 means successful, non-zero means failure),
+    /// and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr parse(isc::data::ConstElementPtr config,
+                                             bool check_only);
+
+    /// @brief Return a list of all paths that contain passwords or secrets.
+    ///
+    /// Used in @ref isc::process::Daemon::redactConfig to only make copies and
+    /// only redact configuration subtrees that contain passwords or secrets.
+    ///
+    /// This method needs to be overridden in each process that has a distinct
+    /// configuration structure.
+    ///
+    /// @return the list of lists of sequential JSON map keys needed to reach
+    /// the passwords and secrets.
+    virtual std::list<std::list<std::string>> jsonPathsToRedact() const;
+
+private:
+    /// @brief Pointer to the configuration context instance.
+    ConfigPtr context_;
+};
+
+/// @brief Defines a shared pointer to DCfgMgrBase.
+typedef boost::shared_ptr<DCfgMgrBase> DCfgMgrBasePtr;
+
+} // end of isc::process namespace
+} // end of isc namespace
+
+#endif // D_CFG_MGR_H
diff --git a/src/lib/process/d_controller.cc b/src/lib/process/d_controller.cc
new file mode 100644
index 0000000..420442c
--- /dev/null
+++ b/src/lib/process/d_controller.cc
@@ -0,0 +1,860 @@
+// Copyright (C) 2013-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/command_interpreter.h>
+#include <process/cfgrpt/config_report.h>
+#include <cryptolink/crypto_hash.h>
+#include <exceptions/exceptions.h>
+#include <config/command_mgr.h>
+#include <hooks/hooks_manager.h>
+#include <log/logger.h>
+#include <log/logger_support.h>
+#include <util/encode/hex.h>
+#include <process/daemon.h>
+#include <process/d_log.h>
+#include <process/d_controller.h>
+#include <process/config_base.h>
+#include <kea_version.h>
+#include <functional>
+#include <sstream>
+#include <string>
+#include <unistd.h>
+#include <signal.h>
+
+using namespace isc::asiolink;
+using namespace isc::config;
+using namespace isc::data;
+using namespace isc::hooks;
+using namespace isc::util;
+namespace ph = std::placeholders;
+
+namespace isc {
+namespace process {
+
+DControllerBasePtr DControllerBase::controller_;
+
+// Note that the constructor instantiates the controller's primary IOService.
+DControllerBase::DControllerBase(const char* app_name, const char* bin_name)
+    : app_name_(app_name), bin_name_(bin_name),
+      verbose_(false), check_only_(false),
+      io_service_(new isc::asiolink::IOService()),
+      io_signal_set_() {
+}
+
+void
+DControllerBase::setController(const DControllerBasePtr& controller) {
+    if (controller_) {
+        // This shouldn't happen, but let's make sure it can't be done.
+        // It represents a programmatic error.
+        isc_throw (DControllerBaseError,
+                "Multiple controller instances attempted.");
+    }
+
+    controller_ = controller;
+}
+
+ConstElementPtr
+DControllerBase::parseFile(const std::string&) {
+    ConstElementPtr elements;
+    return (elements);
+}
+
+int
+DControllerBase::launch(int argc, char* argv[], const bool test_mode) {
+
+    // Step 1 is to parse the command line arguments.
+    try {
+        parseArgs(argc, argv);
+    } catch (const InvalidUsage& ex) {
+        usage(ex.what());
+        // rethrow it with an empty message
+        isc_throw(InvalidUsage, "");
+    }
+
+    setProcName(bin_name_);
+
+    if (isCheckOnly()) {
+        checkConfigOnly();
+        return (EXIT_SUCCESS);
+    }
+
+    // It is important that we set a default logger name because this name
+    // will be used when the user doesn't provide the logging configuration
+    // in the Kea configuration file.
+    Daemon::setDefaultLoggerName(bin_name_);
+
+    // Logger's default configuration depends on whether we are in the
+    // verbose mode or not. CfgMgr manages the logger configuration so
+    // the verbose mode is set for CfgMgr.
+    Daemon::setVerbose(verbose_);
+
+    // Do not initialize logger here if we are running unit tests. It would
+    // replace an instance of unit test specific logger.
+    if (!test_mode) {
+        // Now that we know what the mode flags are, we can init logging.
+        Daemon::loggerInit(bin_name_.c_str(), verbose_);
+    }
+
+    try {
+        checkConfigFile();
+    } catch (const std::exception& ex) {
+        LOG_FATAL(dctl_logger, DCTL_CONFIG_FILE_LOAD_FAIL)
+            .arg(app_name_).arg(ex.what());
+        isc_throw (LaunchError, "Launch Failed: " << ex.what());
+    }
+
+    try {
+        createPIDFile();
+    } catch (const DaemonPIDExists& ex) {
+        LOG_FATAL(dctl_logger, DCTL_ALREADY_RUNNING)
+                  .arg(bin_name_).arg(ex.what());
+        isc_throw (LaunchError, "Launch Failed: " << ex.what());
+    } catch (const std::exception& ex) {
+        LOG_FATAL(dctl_logger, DCTL_PID_FILE_ERROR)
+                  .arg(app_name_).arg(ex.what());
+        isc_throw (LaunchError, "Launch failed: " << ex.what());
+    }
+
+    // Log the starting of the service.
+    LOG_INFO(dctl_logger, DCTL_STARTING)
+        .arg(app_name_)
+        .arg(getpid())
+        .arg(VERSION)
+        .arg(PACKAGE_VERSION_TYPE);
+    // When it is not a stable version dissuade use in production.
+    if (std::string(PACKAGE_VERSION_TYPE) == "development") {
+        LOG_WARN(dctl_logger, DCTL_DEVELOPMENT_VERSION);
+    }
+    try {
+        // Step 2 is to create and initialize the application process object.
+        initProcess();
+    } catch (const std::exception& ex) {
+        LOG_FATAL(dctl_logger, DCTL_INIT_PROCESS_FAIL)
+                  .arg(app_name_).arg(ex.what());
+        isc_throw (ProcessInitError,
+                   "Application Process initialization failed: " << ex.what());
+    }
+
+    LOG_DEBUG(dctl_logger, isc::log::DBGLVL_START_SHUT, DCTL_STANDALONE)
+        .arg(app_name_);
+
+    // Step 3 is to load configuration from file.
+    int rcode;
+    ConstElementPtr comment = parseAnswer(rcode, configFromFile());
+    if (rcode != 0) {
+        LOG_FATAL(dctl_logger, DCTL_CONFIG_FILE_LOAD_FAIL)
+                  .arg(app_name_).arg(comment->stringValue());
+        isc_throw (ProcessInitError, "Could Not load configuration file: "
+                   << comment->stringValue());
+    }
+
+    // Note that the controller was started.
+    start_ = boost::posix_time::second_clock::universal_time();
+
+    // Everything is clear for launch, so start the application's
+    // event loop.
+    try {
+        // Now that we have a process, we can set up signal handling.
+        initSignalHandling();
+        runProcess();
+    } catch (const std::exception& ex) {
+        LOG_FATAL(dctl_logger, DCTL_PROCESS_FAILED)
+                  .arg(app_name_).arg(ex.what());
+        isc_throw (ProcessRunError,
+                   "Application process event loop failed: " << ex.what());
+    }
+
+    // All done, so bail out.
+    LOG_INFO(dctl_logger, DCTL_SHUTDOWN)
+        .arg(app_name_).arg(getpid()).arg(VERSION);
+
+    return (getExitValue());
+}
+
+void
+DControllerBase::checkConfigOnly() {
+    try {
+        // We need to initialize logging, in case any error
+        // messages are to be printed.
+        // This is just a test, so we don't care about lockfile.
+        setenv("KEA_LOCKFILE_DIR", "none", 0);
+        Daemon::setDefaultLoggerName(bin_name_);
+        Daemon::setVerbose(verbose_);
+        Daemon::loggerInit(bin_name_.c_str(), verbose_);
+
+        // Check the syntax first.
+        std::string config_file = getConfigFile();
+        if (config_file.empty()) {
+            // Basic sanity check: file name must not be empty.
+            isc_throw(InvalidUsage, "JSON configuration file not specified");
+        }
+        ConstElementPtr whole_config = parseFile(config_file);
+        if (!whole_config) {
+            // No fallback to fromJSONFile
+            isc_throw(InvalidUsage, "No configuration found");
+        }
+        if (verbose_) {
+            std::cerr << "Syntax check OK" << std::endl;
+        }
+
+        // Check the logic next.
+        ConstElementPtr module_config;
+        module_config = whole_config->get(getAppName());
+        if (!module_config) {
+            isc_throw(InvalidUsage, "Config file " << config_file <<
+                      " does not include '" << getAppName() << "' entry");
+        }
+        if (module_config->getType() != Element::map) {
+            isc_throw(InvalidUsage, "Config file " << config_file <<
+                      " includes not map '" << getAppName() << "' entry");
+        }
+
+        // Handle other (i.e. not application name) objects.
+        std::string errmsg = handleOtherObjects(whole_config);
+        if (!errmsg.empty()) {
+            isc_throw(InvalidUsage, "Config file " << config_file << errmsg);
+        }
+
+        // Get an application process object.
+        initProcess();
+
+        ConstElementPtr answer = checkConfig(module_config);
+        int rcode = 0;
+        answer = parseAnswer(rcode, answer);
+        if (rcode != 0) {
+            isc_throw(InvalidUsage, "Error encountered: "
+                      << answer->stringValue());
+        }
+    } catch (const VersionMessage&) {
+        throw;
+    } catch (const InvalidUsage&) {
+        throw;
+    } catch (const std::exception& ex) {
+        isc_throw(InvalidUsage, "Syntax check failed with: " << ex.what());
+    }
+    return;
+}
+
+void
+DControllerBase::parseArgs(int argc, char* argv[]) {
+
+    if (argc == 1) {
+        isc_throw(InvalidUsage, "");
+    }
+
+    // Iterate over the given command line options. If its a stock option
+    // ("c" or "d") handle it here.  If its a valid custom option, then
+    // invoke customOption.
+    int ch;
+    opterr = 0;
+    optind = 1;
+    std::string opts("dvVWc:t:" + getCustomOpts());
+    while ((ch = getopt(argc, argv, opts.c_str())) != -1) {
+        switch (ch) {
+        case 'd':
+            // Enables verbose logging.
+            verbose_ = true;
+            break;
+
+        case 'v':
+            // gather Kea version and throw so main() can catch and return
+            // rather than calling exit() here which disrupts gtest.
+            isc_throw(VersionMessage, getVersion(false));
+            break;
+
+        case 'V':
+            // gather Kea version and throw so main() can catch and return
+            // rather than calling exit() here which disrupts gtest.
+            isc_throw(VersionMessage, getVersion(true));
+            break;
+
+        case 'W':
+            // gather Kea config report and throw so main() can catch and
+            // return rather than calling exit() here which disrupts gtest.
+            isc_throw(VersionMessage, isc::detail::getConfigReport());
+            break;
+
+        case 'c':
+        case 't':
+            // config file name
+            if (optarg == NULL) {
+                isc_throw(InvalidUsage, "configuration file name missing");
+            }
+
+            setConfigFile(optarg);
+
+            if (ch == 't') {
+                check_only_ = true;
+            }
+            break;
+
+        case '?': {
+            // We hit an invalid option.
+            isc_throw(InvalidUsage, "unsupported option: ["
+                      << static_cast<char>(optopt) << "] "
+                      << (!optarg ? "" : optarg));
+
+            break;
+            }
+
+        default:
+            // We hit a valid custom option
+            if (!customOption(ch, optarg)) {
+                // This would be a programmatic error.
+                isc_throw(InvalidUsage, " Option listed but implemented?: ["
+                          << static_cast<char>(ch) << "] "
+                          << (!optarg ? "" : optarg));
+            }
+            break;
+        }
+    }
+
+    // There was too much information on the command line.
+    if (argc > optind) {
+        isc_throw(InvalidUsage, "extraneous command line information");
+    }
+}
+
+bool
+DControllerBase::customOption(int /* option */, char* /*optarg*/) {
+    // Default implementation returns false.
+    return (false);
+}
+
+void
+DControllerBase::initProcess() {
+    LOG_DEBUG(dctl_logger, isc::log::DBGLVL_START_SHUT, DCTL_INIT_PROCESS)
+        .arg(app_name_);
+
+    // Invoke virtual method to instantiate the application process.
+    try {
+        process_.reset(createProcess());
+    } catch (const std::exception& ex) {
+        isc_throw(DControllerBaseError, std::string("createProcess failed: ")
+                  + ex.what());
+    }
+
+    // This is pretty unlikely, but will test for it just to be safe..
+    if (!process_) {
+        isc_throw(DControllerBaseError, "createProcess returned NULL");
+    }
+
+    // Invoke application's init method (Note this call should throw
+    // DProcessBaseError if it fails).
+    process_->init();
+}
+
+ConstElementPtr
+DControllerBase::configFromFile() {
+    // Rollback any previous staging configuration. For D2, only a
+    // logger configuration is used here.
+    // We're not using cfgmgr to store logging configuration anymore.
+    // isc::dhcp::CfgMgr::instance().rollback();
+
+    // Will hold configuration.
+    ConstElementPtr module_config;
+    // Will receive configuration result.
+    ConstElementPtr answer;
+    try {
+        std::string config_file = getConfigFile();
+        if (config_file.empty()) {
+            // Basic sanity check: file name must not be empty.
+            isc_throw(BadValue, "JSON configuration file not specified. Please "
+                                "use -c command line option.");
+        }
+
+        // If parseFile returns an empty pointer, then pass the file onto the
+        // original JSON parser.
+        ConstElementPtr whole_config = parseFile(config_file);
+        if (!whole_config) {
+            // Read contents of the file and parse it as JSON
+            whole_config = Element::fromJSONFile(config_file, true);
+        }
+
+        // Extract derivation-specific portion of the configuration.
+        module_config = whole_config->get(getAppName());
+        if (!module_config) {
+            isc_throw(BadValue, "Config file " << config_file <<
+                                " does not include '" <<
+                                 getAppName() << "' entry.");
+        }
+        if (module_config->getType() != Element::map) {
+            isc_throw(InvalidUsage, "Config file " << config_file <<
+                      " includes not map '" << getAppName() << "' entry");
+        }
+
+        // Handle other (i.e. not application name) objects.
+        std::string errmsg = handleOtherObjects(whole_config);
+        if (!errmsg.empty()) {
+            isc_throw(InvalidUsage, "Config file " << config_file << errmsg);
+        }
+
+        // Let's configure logging before applying the configuration,
+        // so we can log things during configuration process.
+
+        // Temporary storage for logging configuration
+        ConfigPtr storage(new ConfigBase());
+
+        // Configure logging to the temporary storage.
+        Daemon::configureLogger(module_config, storage);
+
+        // Let's apply the new logging. We do it early, so we'll be able
+        // to print out what exactly is wrong with the new config in
+        // case of problems.
+        storage->applyLoggingCfg();
+
+        answer = updateConfig(module_config);
+        // In all cases the right logging configuration is in the context.
+        process_->getCfgMgr()->getContext()->applyLoggingCfg();
+    } catch (const std::exception& ex) {
+        // Rollback logging configuration.
+        process_->getCfgMgr()->getContext()->applyLoggingCfg();
+
+        // build an error result
+        ConstElementPtr error = createAnswer(CONTROL_RESULT_ERROR,
+                 std::string("Configuration parsing failed: ") + ex.what());
+        return (error);
+    }
+
+    return (answer);
+}
+
+void
+DControllerBase::runProcess() {
+    LOG_DEBUG(dctl_logger, isc::log::DBGLVL_START_SHUT, DCTL_RUN_PROCESS)
+        .arg(app_name_);
+    if (!process_) {
+        // This should not be possible.
+        isc_throw(DControllerBaseError, "Process not initialized");
+    }
+
+    // Invoke the application process's run method. This may throw
+    // DProcessBaseError
+    process_->run();
+}
+
+// Instance method for handling new config
+ConstElementPtr
+DControllerBase::updateConfig(ConstElementPtr new_config) {
+    return (process_->configure(new_config, false));
+}
+
+// Instance method for checking new config
+ConstElementPtr
+DControllerBase::checkConfig(ConstElementPtr new_config) {
+    return (process_->configure(new_config, true));
+}
+
+ConstElementPtr
+DControllerBase::configGetHandler(const std::string&,
+                                  ConstElementPtr /*args*/) {
+    ElementPtr config = process_->getCfgMgr()->getContext()->toElement();
+    std::string hash = BaseCommandMgr::getHash(config);
+    config->set("hash", Element::create(hash));
+
+    return (createAnswer(CONTROL_RESULT_SUCCESS, config));
+}
+
+ConstElementPtr
+DControllerBase::configHashGetHandler(const std::string&,
+                                      ConstElementPtr /*args*/) {
+    ConstElementPtr config = process_->getCfgMgr()->getContext()->toElement();
+    std::string hash = BaseCommandMgr::getHash(config);
+    ElementPtr params = Element::createMap();
+    params->set("hash", Element::create(hash));
+    return (createAnswer(CONTROL_RESULT_SUCCESS, params));
+}
+
+ConstElementPtr
+DControllerBase::configWriteHandler(const std::string&,
+                                    ConstElementPtr args) {
+    std::string filename;
+
+    if (args) {
+        if (args->getType() != Element::map) {
+            return (createAnswer(CONTROL_RESULT_ERROR, "Argument must be a map"));
+        }
+        ConstElementPtr filename_param = args->get("filename");
+        if (filename_param) {
+            if (filename_param->getType() != Element::string) {
+                return (createAnswer(CONTROL_RESULT_ERROR,
+                                     "passed parameter 'filename' "
+                                     "is not a string"));
+            }
+            filename = filename_param->stringValue();
+        }
+    }
+
+    if (filename.empty()) {
+        // filename parameter was not specified, so let's use
+        // whatever we remember
+        filename = getConfigFile();
+        if (filename.empty()) {
+            return (createAnswer(CONTROL_RESULT_ERROR,
+                                 "Unable to determine filename."
+                                 "Please specify filename explicitly."));
+        }
+    }
+
+    // Ok, it's time to write the file.
+    size_t size = 0;
+    ElementPtr cfg = process_->getCfgMgr()->getContext()->toElement();
+
+    try {
+        size = writeConfigFile(filename, cfg);
+    } catch (const isc::Exception& ex) {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                             std::string("Error during write-config:")
+                             + ex.what()));
+    }
+    if (size == 0) {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                             "Error writing configuration to " + filename));
+    }
+
+    // Ok, it's time to return the successful response.
+    ElementPtr params = Element::createMap();
+    params->set("size", Element::create(static_cast<long long>(size)));
+    params->set("filename", Element::create(filename));
+
+    return (createAnswer(CONTROL_RESULT_SUCCESS, "Configuration written to "
+                         + filename + " successful", params));
+}
+
+std::string
+DControllerBase::handleOtherObjects(ConstElementPtr args) {
+    // Check obsolete or unknown (aka unsupported) objects.
+    const std::string& app_name = getAppName();
+    std::string errmsg;
+    for (auto obj : args->mapValue()) {
+        const std::string& obj_name = obj.first;
+        if (obj_name == app_name) {
+            continue;
+        }
+        LOG_ERROR(dctl_logger, DCTL_CONFIG_DEPRECATED)
+            .arg("'" + obj_name + "', defining anything in global level besides '"
+                 + app_name + "' is no longer supported.");
+        if (errmsg.empty()) {
+            errmsg = " contains unsupported '" + obj_name + "' parameter";
+        } else {
+            errmsg += " (and '" + obj_name + "')";
+        }
+    }
+    return (errmsg);
+}
+
+ConstElementPtr
+DControllerBase::configTestHandler(const std::string&, ConstElementPtr args) {
+    const int status_code = CONTROL_RESULT_ERROR; // 1 indicates an error
+    ConstElementPtr module_config;
+    std::string app_name = getAppName();
+    std::string message;
+
+    // Command arguments are expected to be:
+    // { "Module": { ... } }
+    if (!args) {
+        message = "Missing mandatory 'arguments' parameter.";
+    } else {
+        module_config = args->get(app_name);
+        if (!module_config) {
+            message = "Missing mandatory '" + app_name + "' parameter.";
+        } else if (module_config->getType() != Element::map) {
+            message = "'" + app_name + "' parameter expected to be a map.";
+        }
+    }
+
+    if (message.empty()) {
+        // Handle other (i.e. not application name) objects.
+        std::string errmsg = handleOtherObjects(args);
+        if (!errmsg.empty()) {
+            message = "'arguments' parameter" + errmsg;
+        }
+    }
+
+    if (!message.empty()) {
+        // Something is amiss with arguments, return a failure response.
+        ConstElementPtr result = isc::config::createAnswer(status_code,
+                                                           message);
+        return (result);
+    }
+
+    // We are starting the configuration process so we should remove any
+    // staging configuration that has been created during previous
+    // configuration attempts.
+    // We're not using cfgmgr to store logging information anymore.
+    // isc::dhcp::CfgMgr::instance().rollback();
+
+    // Now we check the server proper.
+    return (checkConfig(module_config));
+}
+
+ConstElementPtr
+DControllerBase::configReloadHandler(const std::string&, ConstElementPtr) {
+    // Add reload in message?
+    return (configFromFile());
+}
+
+ConstElementPtr
+DControllerBase::configSetHandler(const std::string&, ConstElementPtr args) {
+    const int status_code = CONTROL_RESULT_ERROR; // 1 indicates an error
+    ConstElementPtr module_config;
+    std::string app_name = getAppName();
+    std::string message;
+
+    // Command arguments are expected to be:
+    // { "Module": { ... } }
+    if (!args) {
+        message = "Missing mandatory 'arguments' parameter.";
+    } else {
+        module_config = args->get(app_name);
+        if (!module_config) {
+            message = "Missing mandatory '" + app_name + "' parameter.";
+        } else if (module_config->getType() != Element::map) {
+            message = "'" + app_name + "' parameter expected to be a map.";
+        }
+    }
+
+    if (!message.empty()) {
+        // Something is amiss with arguments, return a failure response.
+        ConstElementPtr result = isc::config::createAnswer(status_code,
+                                                           message);
+        return (result);
+    }
+
+    try {
+
+        // Handle other (i.e. not application name) objects.
+        handleOtherObjects(args);
+
+        // We are starting the configuration process so we should remove any
+        // staging configuration that has been created during previous
+        // configuration attempts.
+        // We're not using cfgmgr to store logging information anymore.
+        // isc::dhcp::CfgMgr::instance().rollback();
+
+        // Temporary storage for logging configuration
+        ConfigPtr storage(new ConfigBase());
+
+        // Configure logging to the temporary storage.
+        Daemon::configureLogger(module_config, storage);
+
+        // Let's apply the new logging. We do it early, so we'll be able
+        // to print out what exactly is wrong with the new config in
+        // case of problems.
+        storage->applyLoggingCfg();
+
+        ConstElementPtr answer = updateConfig(module_config);
+        int rcode = 0;
+        parseAnswer(rcode, answer);
+        // In all cases the right logging configuration is in the context.
+        process_->getCfgMgr()->getContext()->applyLoggingCfg();
+        return (answer);
+    } catch (const std::exception& ex) {
+        // Rollback logging configuration.
+        process_->getCfgMgr()->getContext()->applyLoggingCfg();
+
+        // build an error result
+        ConstElementPtr error = createAnswer(CONTROL_RESULT_ERROR,
+                 std::string("Configuration parsing failed: ") + ex.what());
+        return (error);
+    }
+}
+
+ConstElementPtr
+DControllerBase::serverTagGetHandler(const std::string&, ConstElementPtr) {
+    const std::string& tag = process_->getCfgMgr()->getContext()->getServerTag();
+    ElementPtr response = Element::createMap();
+    response->set("server-tag", Element::create(tag));
+
+    return (createAnswer(CONTROL_RESULT_SUCCESS, response));
+}
+
+ConstElementPtr
+DControllerBase::statusGetHandler(const std::string&, ConstElementPtr) {
+    ElementPtr status = Element::createMap();
+    status->set("pid", Element::create(static_cast<int>(getpid())));
+
+    auto now = boost::posix_time::second_clock::universal_time();
+    if (!start_.is_not_a_date_time()) {
+        auto uptime = now - start_;
+        status->set("uptime", Element::create(uptime.total_seconds()));
+    }
+
+    auto last_commit = process_->getCfgMgr()->getContext()->getLastCommitTime();
+    if (!last_commit.is_not_a_date_time()) {
+        auto reload = now - last_commit;
+        status->set("reload", Element::create(reload.total_seconds()));
+    }
+
+    return (createAnswer(CONTROL_RESULT_SUCCESS, status));
+}
+
+ConstElementPtr
+DControllerBase::versionGetHandler(const std::string&, ConstElementPtr) {
+    ConstElementPtr answer;
+
+    // For version-get put the extended version in arguments
+    ElementPtr extended = Element::create(getVersion(true));
+    ElementPtr arguments = Element::createMap();
+    arguments->set("extended", extended);
+    answer = createAnswer(CONTROL_RESULT_SUCCESS, getVersion(false), arguments);
+    return (answer);
+}
+
+ConstElementPtr
+DControllerBase::buildReportHandler(const std::string&, ConstElementPtr) {
+    return (createAnswer(CONTROL_RESULT_SUCCESS, isc::detail::getConfigReport()));
+}
+
+ConstElementPtr
+DControllerBase::shutdownHandler(const std::string&, ConstElementPtr args) {
+    // Shutdown is universal.  If its not that, then try it as
+    // a custom command supported by the derivation.  If that
+    // doesn't pan out either, than send to it the application
+    // as it may be supported there.
+
+    int exit_value = EXIT_SUCCESS;
+    if (args) {
+        // @todo Should we go ahead and shutdown even if the args are invalid?
+        if (args->getType() != Element::map) {
+            return (createAnswer(CONTROL_RESULT_ERROR, "Argument must be a map"));
+        }
+
+        ConstElementPtr param = args->get("exit-value");
+        if (param)  {
+            if (param->getType() != Element::integer) {
+                return (createAnswer(CONTROL_RESULT_ERROR,
+                                     "parameter 'exit-value' is not an integer"));
+            }
+
+            exit_value = param->intValue();
+        }
+    }
+
+    setExitValue(exit_value);
+    return (shutdownProcess(args));
+}
+
+ConstElementPtr
+DControllerBase::shutdownProcess(ConstElementPtr args) {
+    if (process_) {
+        return (process_->shutdown(args));
+    }
+
+    // Not really a failure, but this condition is worth noting. In reality
+    // it should be pretty hard to cause this.
+    LOG_WARN(dctl_logger, DCTL_NOT_RUNNING).arg(app_name_);
+    return (createAnswer(CONTROL_RESULT_SUCCESS, "Process has not been initialized"));
+}
+
+void
+DControllerBase::initSignalHandling() {
+    /// @todo block everything we don't handle
+
+    // Create our signal set.
+    io_signal_set_.reset(new IOSignalSet(io_service_,
+                                         std::bind(&DControllerBase::
+                                                   processSignal,
+                                                   this, ph::_1)));
+    // Register for the signals we wish to handle.
+    io_signal_set_->add(SIGHUP);
+    io_signal_set_->add(SIGINT);
+    io_signal_set_->add(SIGTERM);
+}
+
+void
+DControllerBase::processSignal(int signum) {
+    switch (signum) {
+        case SIGHUP:
+        {
+            LOG_INFO(dctl_logger, DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD)
+                     .arg(signum).arg(getConfigFile());
+            int rcode;
+            ConstElementPtr comment = parseAnswer(rcode, configFromFile());
+            if (rcode != 0) {
+                LOG_ERROR(dctl_logger, DCTL_CFG_FILE_RELOAD_ERROR)
+                          .arg(comment->stringValue());
+            }
+
+            break;
+        }
+
+        case SIGINT:
+        case SIGTERM:
+        {
+            LOG_DEBUG(dctl_logger, isc::log::DBGLVL_START_SHUT,
+                      DCTL_SHUTDOWN_SIGNAL_RECVD).arg(signum);
+            ElementPtr arg_set;
+            shutdownHandler(SHUT_DOWN_COMMAND, arg_set);
+            break;
+        }
+
+        default:
+            LOG_WARN(dctl_logger, DCTL_UNSUPPORTED_SIGNAL).arg(signum);
+            break;
+    }
+}
+
+void
+DControllerBase::usage(const std::string & text) {
+    if (text != "") {
+        std::cerr << "Usage error: " << text << std::endl;
+    }
+
+    std::cerr << "Usage: " << bin_name_ <<  std::endl
+              << "  -v: print version number and exit" << std::endl
+              << "  -V: print extended version information and exit"
+              << std::endl
+              << "  -W: display the configuration report and exit"
+              << std::endl
+              << "  -d: optional, verbose output " << std::endl
+              << "  -c <config file name> : mandatory,"
+              << " specify name of configuration file" << std::endl
+              << "  -t <config file name> : check the"
+              << " configuration file and exit" << std::endl;
+
+    // add any derivation specific usage
+    std::cerr << getUsageText() << std::endl;
+}
+
+DControllerBase::~DControllerBase() {
+    // Explicitly unload hooks
+    HooksManager::prepareUnloadLibraries();
+    if (!HooksManager::unloadLibraries()) {
+        auto names = HooksManager::getLibraryNames();
+        std::string msg;
+        if (!names.empty()) {
+            msg = names[0];
+            for (size_t i = 1; i < names.size(); ++i) {
+                msg += std::string(", ") + names[i];
+            }
+        }
+        LOG_ERROR(dctl_logger, DCTL_UNLOAD_LIBRARIES_ERROR).arg(msg);
+    }
+
+    io_signal_set_.reset();
+    getIOService()->poll();
+}
+
+std::string
+DControllerBase::getVersion(bool extended) {
+    std::stringstream tmp;
+
+    tmp << VERSION;
+    if (extended) {
+        tmp << std::endl << EXTENDED_VERSION << std::endl;
+        tmp << "linked with:" << std::endl;
+        tmp << isc::log::Logger::getVersion() << std::endl;
+        tmp << getVersionAddendum();
+    }
+
+    return (tmp.str());
+}
+
+} // end of namespace isc::process
+
+} // end of namespace isc
diff --git a/src/lib/process/d_controller.h b/src/lib/process/d_controller.h
new file mode 100644
index 0000000..e16253e
--- /dev/null
+++ b/src/lib/process/d_controller.h
@@ -0,0 +1,663 @@
+// Copyright (C) 2013-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D_CONTROLLER_H
+#define D_CONTROLLER_H
+
+#include <asiolink/io_service.h>
+#include <asiolink/io_service_signal.h>
+#include <cc/data.h>
+#include <exceptions/exceptions.h>
+#include <log/logger_support.h>
+#include <process/daemon.h>
+#include <process/d_log.h>
+#include <process/d_process.h>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/noncopyable.hpp>
+
+#include <string>
+#include <set>
+
+namespace isc {
+namespace process {
+
+/// @brief Exception thrown when the command line is invalid.
+/// Can be used to transmit negative messages too.
+class InvalidUsage : public isc::Exception {
+public:
+    InvalidUsage(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Exception used to convey version info upwards.
+/// Since command line argument parsing is done as part of
+/// DControllerBase::launch(), it uses this exception to propagate
+/// version information up to main(), when command line argument
+/// -v, -V or -W is given. Can be used to transmit positive messages too.
+class VersionMessage : public isc::Exception {
+public:
+    VersionMessage(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Exception thrown when the controller launch fails.
+class LaunchError: public isc::Exception {
+public:
+    LaunchError (const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Exception thrown when the application process fails.
+class ProcessInitError: public isc::Exception {
+public:
+    ProcessInitError (const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Exception thrown when the application process encounters an
+/// operation in its event loop (i.e. run method).
+class ProcessRunError: public isc::Exception {
+public:
+    ProcessRunError (const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Exception thrown when the controller encounters an operational error.
+class DControllerBaseError : public isc::Exception {
+public:
+    DControllerBaseError (const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Defines a shared pointer to DControllerBase.
+class DControllerBase;
+typedef boost::shared_ptr<DControllerBase> DControllerBasePtr;
+
+/// @brief Application Controller
+///
+/// DControllerBase is an abstract singleton which provides the framework and
+/// services for managing an application process that implements the
+/// DProcessBase interface.  It runs the process like a stand-alone, command
+/// line driven executable, which must be supplied a configuration file at
+/// startup. It coordinates command line argument parsing, process
+/// instantiation and initialization, and runtime control through external
+/// command and configuration event handling.
+/// It creates the IOService instance which is used for runtime control
+/// events and passes the IOService into the application process at process
+/// creation.
+/// It provides the callback handlers for command and configuration events
+/// which could be triggered by an external source.  Such sources are intended
+/// to be registered with and monitored by the controller's IOService such that
+/// the appropriate handler can be invoked.
+///
+/// DControllerBase provides dynamic configuration file reloading upon receipt
+/// of SIGHUP, and graceful shutdown upon receipt of either SIGINT or SIGTERM.
+///
+/// NOTE: Derivations must supply their own static singleton instance method(s)
+/// for creating and fetching the instance. The base class declares the instance
+/// member in order for it to be available for static callback functions.
+class DControllerBase : public Daemon {
+public:
+    /// @brief Constructor
+    ///
+    /// @param app_name is display name of the application under control. This
+    /// name appears in log statements.
+    /// @param bin_name is the name of the application executable.
+    DControllerBase(const char* app_name, const char* bin_name);
+
+    /// @brief Destructor
+    virtual ~DControllerBase();
+
+    /// @brief returns Kea version on stdout and exit.
+    /// redeclaration/redefinition. @ref isc::process::Daemon::getVersion()
+    std::string getVersion(bool extended);
+
+    /// @brief Acts as the primary entry point into the controller execution
+    /// and provides the outermost application control logic:
+    ///
+    /// 1. parse command line arguments
+    /// 2. instantiate and initialize the application process
+    /// 3. load the configuration file
+    /// 4. record the start timestamp
+    /// 5. initialize signal handling
+    /// 6. start and wait on the application process event loop
+    /// 7. exit to the caller
+    ///
+    /// It is intended to be called from main() and be given the command line
+    /// arguments.
+    ///
+    /// This function can be run in "test mode". It prevents initialization
+    /// of module logger. This is used in unit tests which initialize logger
+    /// in their main function. Such a logger uses environmental variables to
+    /// control severity, verbosity etc.
+    ///
+    /// @param argc  is the number of command line arguments supplied
+    /// @param argv  is the array of string (char *) command line arguments
+    /// @param test_mode is a bool value which indicates if
+    /// @c DControllerBase::launch should be run in the test mode (if true).
+    /// This parameter doesn't have default value to force test implementers to
+    /// enable test mode explicitly.
+    ///
+    /// @throw throws one of the following exceptions:
+    /// InvalidUsage - Indicates invalid command line.
+    /// ProcessInitError  - Failed to create and initialize application
+    /// process object.
+    /// ProcessRunError - A fatal error occurred while in the application
+    /// process event loop.
+    /// @return The value from @c Daemon::getExitValue().
+    virtual int launch(int argc, char* argv[], const bool test_mode);
+
+    /// @brief Instance method invoked by the configuration event handler and
+    /// which processes the actual configuration update.  Provides behavioral
+    /// path for both integrated and stand-alone modes. The current
+    /// implementation will merge the configuration update into the existing
+    /// configuration and then invoke the application process' configure method.
+    ///
+    /// @param  new_config is the new configuration
+    ///
+    /// @return returns an Element that contains the results of configuration
+    /// update composed of an integer status value (0 means successful,
+    /// non-zero means failure), and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr updateConfig(isc::data::ConstElementPtr
+                                                    new_config);
+
+    /// @brief Instance method invoked by the configuration event handler and
+    /// which processes the actual configuration check.  Provides behavioral
+    /// path for both integrated and stand-alone modes. The current
+    /// implementation will merge the configuration update into the existing
+    /// configuration and then invoke the application process' configure method
+    /// with a final rollback.
+    ///
+    /// @param  new_config is the new configuration
+    ///
+    /// @return returns an Element that contains the results of configuration
+    /// update composed of an integer status value (0 means successful,
+    /// non-zero means failure), and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr checkConfig(isc::data::ConstElementPtr
+                                                   new_config);
+
+    /// @brief Reconfigures the process from a configuration file
+    ///
+    /// By default the file is assumed to be a JSON text file whose contents
+    /// include at least:
+    ///
+    /// @code
+    ///  { "<module-name>": {<module-config>}
+    ///  }
+    ///
+    ///  where:
+    ///     module-name : is a label which uniquely identifies the
+    ///                   configuration data for this controller's application
+    ///
+    ///     module-config: a set of zero or more JSON elements which comprise
+    ///                    the application's configuration values
+    /// @endcode
+    ///
+    /// To translate the JSON content into Elements, @c parseFile() is called
+    /// first.  This virtual method provides derivations a means to parse the
+    /// file content using an alternate parser.  If it returns an empty pointer
+    /// than the JSON parsing providing by Element::fromJSONFile() is called.
+    ///
+    /// Once parsed, the method extracts the set of configuration
+    /// elements for the module-name that matches the controller's app_name_,
+    /// looks for the loggers entry and, if present uses it to configure
+    /// logging. It then passes that set into @c updateConfig() (or
+    /// @c checkConfig()).
+    ///
+    /// The file may contain an arbitrary number of other modules.
+    ///
+    /// @return returns an Element that contains the results of configuration
+    /// update composed of an integer status value (0 means successful,
+    /// non-zero means failure), and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr configFromFile();
+
+    /// @brief Fetches the name of the application under control.
+    ///
+    /// @return returns the controller service name string
+    std::string getAppName() const {
+        return (app_name_);
+    }
+
+    /// @brief Fetches the name of the application executable.
+    ///
+    /// @return returns the controller logger name string
+    std::string getBinName() const {
+        return (bin_name_);
+    }
+
+    /// @brief handler for version-get command
+    ///
+    /// This method handles the version-get command. It returns the basic and
+    /// extended version.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return answer with version details.
+    isc::data::ConstElementPtr
+    versionGetHandler(const std::string& command,
+                      isc::data::ConstElementPtr args);
+
+    /// @brief handler for 'build-report' command
+    ///
+    /// This method handles build-report command. It returns the output printed
+    /// by configure script which contains most compilation parameters.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return answer with build report
+    isc::data::ConstElementPtr
+    buildReportHandler(const std::string& command,
+                       isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-get command
+    ///
+    /// This method handles the config-get command, which retrieves
+    /// the current configuration and returns it in response.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return current configuration wrapped in a response
+    isc::data::ConstElementPtr
+    configGetHandler(const std::string& command,
+                     isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-hash-get command
+    ///
+    /// This method handles the config-hash-get command, which retrieves
+    /// the current configuration and returns it in response.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return hash of current configuration wrapped in a response
+    isc::data::ConstElementPtr
+    configHashGetHandler(const std::string& command,
+                         isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-write command
+    ///
+    /// This handle processes write-config command, which writes the
+    /// current configuration to disk. This command takes one optional
+    /// parameter called filename. If specified, the current configuration
+    /// will be written to that file. If not specified, the file used during
+    /// Kea start-up will be used. To avoid any exploits, the path is
+    /// always relative and .. is not allowed in the filename. This is
+    /// a security measure against exploiting file writes remotely.
+    ///
+    /// @param command (ignored)
+    /// @param args may contain optional string argument filename
+    /// @return status of the configuration file write
+    isc::data::ConstElementPtr
+    configWriteHandler(const std::string& command,
+                       isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-test command
+    ///
+    /// This method handles the config-test command, which checks
+    /// configuration specified in args parameter.
+    ///
+    /// @param command (ignored)
+    /// @param args configuration to be checked.
+    /// @return status of the command
+    isc::data::ConstElementPtr
+    configTestHandler(const std::string& command,
+                      isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-reload command
+    ///
+    /// This method handles the config-reload command, which reloads
+    /// the configuration file.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return status of the command
+    isc::data::ConstElementPtr
+    configReloadHandler(const std::string& command,
+                        isc::data::ConstElementPtr args);
+
+    /// @brief handler for config-set command
+    ///
+    /// This method handles the config-set command, which loads
+    /// configuration specified in args parameter.
+    ///
+    /// @param command (ignored)
+    /// @param args configuration to be checked.
+    /// @return status of the command
+    isc::data::ConstElementPtr
+    configSetHandler(const std::string& command,
+                     isc::data::ConstElementPtr args);
+
+    /// @brief handler for 'shutdown' command
+    ///
+    /// This method handles shutdown command. It initiates the shutdown procedure
+    /// using CPL methods.
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return answer confirming that the shutdown procedure is started
+    isc::data::ConstElementPtr
+    shutdownHandler(const std::string& command,
+                    isc::data::ConstElementPtr args);
+
+    /// @brief handler for server-tag-get command
+    ///
+    /// This method handles the server-tag-get command, which retrieves
+    /// the current server tag and returns it in response.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return current configuration wrapped in a response
+    isc::data::ConstElementPtr
+    serverTagGetHandler(const std::string& command,
+                        isc::data::ConstElementPtr args);
+
+    /// @brief handler for status-get command
+    ///
+    /// This method handles the status-get command, which retrieves
+    /// the server process information i.e. the pid and returns it in
+    /// response.
+    ///
+    /// @param command (ignored)
+    /// @param args (ignored)
+    /// @return process information wrapped in a response
+    isc::data::ConstElementPtr
+    statusGetHandler(const std::string& command,
+                     isc::data::ConstElementPtr args);
+
+protected:
+    /// @brief Virtual method that provides derivations the opportunity to
+    /// support additional command line options.  It is invoked during command
+    /// line argument parsing (see parseArgs method) if the option is not
+    /// recognized as a stock DControllerBase option.
+    ///
+    /// @param option is the option "character" from the command line, without
+    /// any prefixing hyphen(s)
+    /// @param optarg is the argument value (if one) associated with the option
+    ///
+    /// @return must return true if the option was valid, false if it is
+    /// invalid. (Note the default implementation always returns false.)
+    virtual bool customOption(int option, char *optarg);
+
+    /// @brief Abstract method that is responsible for instantiating the
+    /// application process object. It is invoked by the controller after
+    /// command line argument parsing as part of the process initialization
+    /// (see initProcess method).
+    ///
+    /// @return returns a pointer to the new process object (DProcessBase*)
+    /// or NULL if the create fails.
+    /// Note this value is subsequently wrapped in a smart pointer.
+    virtual DProcessBase* createProcess() = 0;
+
+    /// @brief Virtual method which can be used to contribute derivation
+    /// specific usage text.  It is invoked by the usage() method under
+    /// invalid usage conditions.
+    ///
+    /// @return returns the desired text.
+    virtual const std::string getUsageText() const {
+        return ("");
+    }
+
+    /// @brief Virtual method which returns a string containing the option
+    /// letters for any custom command line options supported by the derivation.
+    /// These are added to the stock options of "c", "d", ..., during command
+    /// line interpretation.
+    ///
+    /// @return returns a string containing the custom option letters.
+    virtual const std::string getCustomOpts() const {
+        return ("");
+    }
+
+    /// @brief Check the configuration
+    ///
+    /// Called by @c launch() when @c check_only_ mode is enabled
+    /// @throw VersionMessage when successful but a message should be displayed
+    /// @throw InvalidUsage when an error was detected
+    void checkConfigOnly();
+
+    /// @brief Application-level signal processing method.
+    ///
+    /// This method is the last step in processing a OS signal occurrence.
+    /// It currently supports the following signals as follows:
+    /// -# SIGHUP - instigates reloading the configuration file
+    /// -# SIGINT - instigates a graceful shutdown
+    /// -# SIGTERM - instigates a graceful shutdown
+    /// If it receives any other signal, it will issue a debug statement and
+    /// discard it.
+    /// Derivations wishing to support additional signals could override this
+    /// method with one that: processes the signal if it is one of additional
+    /// signals, otherwise invoke this method (DControllerBase::processSignal())
+    /// with the signal value.
+    /// @todo Provide a convenient way for derivations to register additional
+    /// signals.
+    virtual void processSignal(int signum);
+
+    /// @brief Supplies whether or not verbose logging is enabled.
+    ///
+    /// @return returns true if verbose logging is enabled.
+    bool isVerbose() const {
+        return (verbose_);
+    }
+
+    /// @brief Method for enabling or disabling verbose logging.
+    ///
+    /// @param value is the new value to assign the flag.
+    void setVerbose(bool value) {
+        verbose_ = value;
+    }
+
+    /// @brief Supplies whether or not check only mode is enabled.
+    ///
+    /// @return returns true if check only is enabled.
+    bool isCheckOnly() const {
+        return (check_only_);
+    }
+
+    /// @brief Method for enabling or disabling check only mode.
+    ///
+    /// @todo this method and @c setVerbose are currently not used.
+    ///
+    /// @param value is the new value to assign the flag.
+    void setCheckOnly(bool value) {
+        check_only_ = value;
+    }
+
+    /// @brief Getter for fetching the controller's IOService
+    ///
+    /// @return returns a pointer reference to the IOService.
+    asiolink::IOServicePtr& getIOService() {
+        return (io_service_);
+    }
+
+    /// @brief Static getter which returns the singleton instance.
+    ///
+    /// @return returns a pointer reference to the private singleton instance
+    /// member.
+    static DControllerBasePtr& getController() {
+        return (controller_);
+    }
+
+    /// @brief Static setter which sets the singleton instance.
+    ///
+    /// @param controller is a pointer to the singleton instance.
+    ///
+    /// @throw throws DControllerBase error if an attempt is made to set the
+    /// instance a second time.
+    static void setController(const DControllerBasePtr& controller);
+
+    /// @brief Processes the command line arguments. It is the first step
+    /// taken after the controller has been launched.  It combines the stock
+    /// list of options with those returned by getCustomOpts(), and uses
+    /// cstdlib's getopt to loop through the command line.
+    /// It handles stock options directly, and passes any custom options into
+    /// the customOption method.  Currently there are only some stock options
+    /// -c/t for specifying the configuration file, -d for verbose logging,
+    /// and -v/V/W for version reports.
+    ///
+    /// @param argc  is the number of command line arguments supplied
+    /// @param argv  is the array of string (char *) command line arguments
+    ///
+    /// @throw InvalidUsage when there are usage errors.
+    /// @throw VersionMessage if the -v, -V or -W arguments is given.
+    void parseArgs(int argc, char* argv[]);
+
+    ///@brief Parse a given file into Elements
+    ///
+    /// This method provides a means for deriving classes to use alternate
+    /// parsing mechanisms to parse configuration files into the corresponding
+    /// isc::data::Elements. The elements produced must be equivalent to those
+    /// which would be produced by the original JSON parsing.  Implementations
+    /// should throw when encountering errors.
+    ///
+    /// The default implementation returns an empty pointer, signifying to
+    /// callers that they should submit the file to the original parser.
+    ///
+    /// @param file_name pathname of the file to parse
+    ///
+    /// @return pointer to the elements created
+    ///
+    virtual isc::data::ConstElementPtr parseFile(const std::string& file_name);
+
+    ///@brief Parse text into Elements
+    ///
+    /// This method provides a means for deriving classes to use alternate
+    /// parsing mechanisms to parse configuration text into the corresponding
+    /// isc::data::Elements. The elements produced must be equivalent to those
+    /// which would be produced by the original JSON parsing.  Implementations
+    /// should throw when encountering errors.
+    ///
+    /// The default implementation returns an empty pointer, signifying to
+    /// callers that they should submit the text to the original parser.
+    ///
+    /// @param input text to parse
+    ///
+    /// @return pointer to the elements created
+    ///
+    virtual isc::data::ConstElementPtr parseText(const std::string& input) {
+        static_cast<void>(input); // just tu shut up the unused parameter warning
+        isc::data::ConstElementPtr elements;
+        return (elements);
+    }
+
+    /// @brief Instantiates the application process and then initializes it.
+    /// This is the second step taken during launch, following successful
+    /// command line parsing. It is used to invoke the derivation-specific
+    /// implementation of createProcess, following by an invoking of the
+    /// newly instantiated process's init method.
+    ///
+    /// @throw throws DControllerBaseError or indirectly DProcessBaseError
+    /// if there is a failure creating or initializing the application process.
+    void initProcess();
+
+    /// @brief Invokes the application process's event loop,(DBaseProcess::run).
+    /// It is called during launch only after successfully completing the
+    /// requested setup: command line parsing, application initialization,
+    /// and session establishment (if not stand-alone).
+    /// The process event loop is expected to only return upon application
+    /// shutdown either in response to the shutdown command or due to an
+    /// unrecoverable error.
+    ///
+    // @throw throws DControllerBaseError or indirectly DProcessBaseError
+    void runProcess();
+
+    /// @brief Initiates shutdown procedure.  This method is invoked
+    /// by executeCommand in response to the shutdown command. It will invoke
+    /// the application process's shutdown method which causes the process to
+    /// to begin its shutdown process.
+    ///
+    /// Note, it is assumed that the process of shutting down is neither
+    /// instantaneous nor synchronous.  This method does not "block" waiting
+    /// until the process has halted.  Rather it is used to convey the
+    /// need to shutdown.  A successful return indicates that the shutdown
+    /// has successfully commenced, but does not indicate that the process
+    /// has actually exited.
+    ///
+    /// @return returns an Element that contains the results of shutdown
+    /// command composed of an integer status value (0 means successful,
+    /// non-zero means failure), and a string explanation of the outcome.
+    ///
+    /// @param args is a set of derivation-specific arguments (if any)
+    /// for the shutdown command.
+    isc::data::ConstElementPtr shutdownProcess(isc::data::ConstElementPtr args);
+
+    /// @brief Initializes signal handling
+    ///
+    /// This method configures the controller to catch and handle signals.
+    /// It instantiates a IOSignalSet which listens for SIGHUP, SIGINT, and
+    /// SIGTERM.
+    void initSignalHandling();
+
+    /// @brief Fetches the current process
+    ///
+    /// @return a pointer to the current process instance.
+    DProcessBasePtr getProcess() {
+        return (process_);
+    }
+
+    /// @brief Prints the program usage text to std error.
+    ///
+    /// @param text is a string message which will preceded the usage text.
+    /// This is intended to be used for specific usage violation messages.
+    void usage(const std::string& text);
+
+    /// @brief Fetches text containing additional version specifics
+    ///
+    /// This method is provided so derivations can append any additional
+    /// desired information such as library dependencies to the extended
+    /// version text returned when DControllerBase::getVersion(true) is
+    /// invoked.
+    /// @return a string containing additional version info
+    virtual std::string getVersionAddendum() { return (""); }
+
+    /// @brief Deals with other (i.e. not application name) global objects.
+    ///
+    /// Code shared between configuration handlers:
+    ///  - check obsolete or unknown (aka unsupported) objects.
+    ///
+    /// @param args Command arguments.
+    /// @return Error message or empty string.
+    std::string handleOtherObjects(isc::data::ConstElementPtr args);
+
+private:
+    /// @brief Name of the service under control.
+    /// This name is used as the configuration module name and appears in log
+    /// statements.
+    std::string app_name_;
+
+    /// @brief Name of the service executable.
+    /// By convention this matches the executable name. It is also used to
+    /// establish the logger name.
+    std::string bin_name_;
+
+    /// @brief Indicates if the verbose logging mode is enabled.
+    bool verbose_;
+
+    /// @brief Indicates if the check only mode for the configuration
+    /// is enabled (usually specified by the command line -t argument).
+    bool check_only_;
+
+    /// @brief Pointer to the instance of the process.
+    ///
+    /// This is required for config and command handlers to gain access to
+    /// the process
+    DProcessBasePtr process_;
+
+    /// @brief Shared pointer to an IOService object, used for ASIO operations.
+    isc::asiolink::IOServicePtr io_service_;
+
+    /// @brief ASIO signal set.
+    isc::asiolink::IOSignalSetPtr io_signal_set_;
+
+    /// @brief Singleton instance value.
+    static DControllerBasePtr controller_;
+
+// DControllerTest is named a friend class to facilitate unit testing while
+// leaving the intended member scopes intact.
+friend class DControllerTest;
+};
+
+}  // namespace process
+}  // namespace isc
+
+#endif
diff --git a/src/lib/process/d_log.cc b/src/lib/process/d_log.cc
new file mode 100644
index 0000000..a449996
--- /dev/null
+++ b/src/lib/process/d_log.cc
@@ -0,0 +1,21 @@
+// Copyright (C) 2013-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/// Defines the logger used by the top-level component of kea-dhcp-ddns.
+
+#include <config.h>
+
+#include <process/d_log.h>
+
+namespace isc {
+namespace process {
+
+/// @brief Defines the logger used within libkea-process library.
+isc::log::Logger dctl_logger("dctl");
+
+} // namespace process
+} // namespace isc
+
diff --git a/src/lib/process/d_log.h b/src/lib/process/d_log.h
new file mode 100644
index 0000000..5a20cf4
--- /dev/null
+++ b/src/lib/process/d_log.h
@@ -0,0 +1,23 @@
+// Copyright (C) 2013-2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D_LOG_H
+#define D_LOG_H
+
+#include <log/logger_support.h>
+#include <log/macros.h>
+#include <process/process_messages.h>
+
+namespace isc {
+namespace process {
+
+/// Define the loggers used within libkea-process library.
+extern isc::log::Logger dctl_logger;
+
+} // namespace process
+} // namespace isc
+
+#endif // D_LOG_H
diff --git a/src/lib/process/d_process.h b/src/lib/process/d_process.h
new file mode 100644
index 0000000..e2b9309
--- /dev/null
+++ b/src/lib/process/d_process.h
@@ -0,0 +1,214 @@
+// Copyright (C) 2013-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D_PROCESS_H
+#define D_PROCESS_H
+
+#include <asiolink/io_service.h>
+#include <cc/data.h>
+#include <process/d_cfg_mgr.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <exceptions/exceptions.h>
+
+#include <atomic>
+
+namespace isc {
+namespace process {
+
+/// @brief Exception thrown if the process encountered an operational error.
+class DProcessBaseError : public isc::Exception {
+public:
+    DProcessBaseError(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief String value for the version-get command.
+static const std::string VERSION_GET_COMMAND("version-get");
+
+/// @brief String value for the build-report command.
+static const std::string BUILD_REPORT_COMMAND("build-report");
+
+/// @brief String value for the config-get command.
+static const std::string CONFIG_GET_COMMAND("config-get");
+
+/// @brief String value for the config-hash-get command.
+static const std::string CONFIG_HASH_GET_COMMAND("config-hash-get");
+
+/// @brief String value for the config-write command.
+static const std::string CONFIG_WRITE_COMMAND("config-write");
+
+/// @brief String value for the config-test command.
+static const std::string CONFIG_TEST_COMMAND("config-test");
+
+/// @brief String value for the config-reload command.
+static const std::string CONFIG_RELOAD_COMMAND("config-reload");
+
+/// @brief String value for the config-set command.
+static const std::string CONFIG_SET_COMMAND("config-set");
+
+/// @brief String value for the server-tag-get command.
+static const std::string SERVER_TAG_GET_COMMAND("server-tag-get");
+
+/// @brief String value for the shutdown command.
+static const std::string SHUT_DOWN_COMMAND("shutdown");
+
+/// @brief String value for the status-get command.
+static const std::string STATUS_GET_COMMAND("status-get");
+
+/// @brief Application Process Interface
+///
+/// DProcessBase is an abstract class represents the primary "application"
+/// level object in a "managed" asynchronous application. It provides a uniform
+/// interface such that a managing layer can construct, initialize, and start
+/// the application's event loop.  The event processing is centered around the
+/// use of isc::asiolink::io_service. The io_service is shared between the
+/// managing layer and the DProcessBase.  This allows management layer IO such
+/// as directives to be sensed and handled, as well as processing IO activity
+/// specific to the application.  In terms of management layer IO, there are
+/// methods shutdown, configuration updates, and commands unique to the
+/// application.
+class DProcessBase {
+public:
+    /// @brief Constructor
+    ///
+    /// @param app_name is a text label for the process. Generally used
+    /// in log statements, but otherwise arbitrary.
+    /// @param io_service is the io_service used by the caller for
+    /// asynchronous event handling.
+    /// @param cfg_mgr the configuration manager instance that handles
+    /// configuration parsing.
+    ///
+    /// @throw DProcessBaseError is io_service is NULL.
+    DProcessBase(const char* app_name, asiolink::IOServicePtr io_service,
+                 DCfgMgrBasePtr cfg_mgr)
+        : app_name_(app_name), io_service_(io_service), shut_down_flag_(false),
+        cfg_mgr_(cfg_mgr) {
+        if (!io_service_) {
+            isc_throw (DProcessBaseError, "IO Service cannot be null");
+        }
+
+        if (!cfg_mgr_) {
+            isc_throw (DProcessBaseError, "CfgMgr cannot be null");
+        }
+    };
+
+    /// @brief May be used after instantiation to perform initialization unique
+    /// to application. It must be invoked prior to invoking run. This would
+    /// likely include the creation of additional IO sources and their
+    /// integration into the io_service.
+    /// @throw DProcessBaseError if the initialization fails.
+    virtual void init() = 0;
+
+    /// @brief Implements the process's event loop. In its simplest form it
+    /// would an invocation io_service_->run().  This method should not exit
+    /// until the process itself is exiting due to a request to shutdown or
+    /// some anomaly is forcing an exit.
+    /// @throw DProcessBaseError if an operational error is encountered.
+    virtual void run() = 0;
+
+    /// @brief Initiates the process's shutdown process.
+    ///
+    /// This is last step in the shutdown event callback chain, that is
+    /// intended to notify the process it is to begin its shutdown process.
+    ///
+    /// @param args an Element set of shutdown arguments (if any) that are
+    /// supported by the process derivation.
+    ///
+    /// @return an Element that contains the results of argument processing,
+    /// consisting of an integer status value (0 means successful,
+    /// non-zero means failure), and a string explanation of the outcome.
+    ///
+    /// @throw DProcessBaseError if an operational error is encountered.
+    virtual isc::data::ConstElementPtr
+    shutdown(isc::data::ConstElementPtr args) = 0;
+
+    /// @brief Processes the given configuration.
+    ///
+    /// This method may be called multiple times during the process lifetime.
+    /// Certainly once during process startup, and possibly later if the user
+    /// alters configuration. This method must not throw, it should catch any
+    /// processing errors and return a success or failure answer as described
+    /// below. On success the last commit timestamp must be updated.
+    ///
+    /// @param config_set a new configuration (JSON) for the process
+    /// @param check_only true if configuration is to be verified only, not applied
+    /// @return an Element that contains the results of configuration composed
+    /// of an integer status value (0 means successful, non-zero means failure),
+    /// and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr
+    configure(isc::data::ConstElementPtr config_set,
+              bool check_only = false) = 0;
+
+    /// @brief Destructor
+    virtual ~DProcessBase(){};
+
+    /// @brief Checks if the process has been instructed to shut down.
+    ///
+    /// @return true if process shutdown flag is true.
+    bool shouldShutdown() const {
+        return (shut_down_flag_);
+    }
+
+    /// @brief Sets the process shut down flag to the given value.
+    ///
+    /// @param value is the new value to assign the flag.
+    void setShutdownFlag(bool value) {
+        shut_down_flag_ = value;
+    }
+
+    /// @brief Fetches the application name.
+    ///
+    /// @return application name string.
+    const std::string getAppName() const {
+        return (app_name_);
+    }
+
+    /// @brief Fetches the controller's IOService.
+    ///
+    /// @return a reference to the controller's IOService.
+    asiolink::IOServicePtr& getIoService() {
+        return (io_service_);
+    }
+
+    /// @brief Convenience method for stopping IOservice processing.
+    /// Invoking this will cause the process to exit any blocking
+    /// IOService method such as run().  No further IO events will be
+    /// processed.
+    void stopIOService() {
+        io_service_->stop();
+    }
+
+    /// @brief Fetches the process's configuration manager.
+    ///
+    /// @return a reference to the configuration manager.
+    DCfgMgrBasePtr& getCfgMgr() {
+        return (cfg_mgr_);
+    }
+
+private:
+    /// @brief Text label for the process. Generally used in log statements,
+    /// but otherwise can be arbitrary.
+    std::string app_name_;
+
+    /// @brief The IOService to be used for asynchronous event handling.
+    asiolink::IOServicePtr io_service_;
+
+    /// @brief Boolean flag set when shutdown has been requested.
+    std::atomic<bool> shut_down_flag_;
+
+    /// @brief  Pointer to the configuration manager.
+    DCfgMgrBasePtr cfg_mgr_;
+};
+
+/// @brief Defines a shared pointer to DProcessBase.
+typedef boost::shared_ptr<DProcessBase> DProcessBasePtr;
+
+}  // namespace process
+}  // namespace isc
+
+#endif
diff --git a/src/lib/process/daemon.cc b/src/lib/process/daemon.cc
new file mode 100644
index 0000000..3ca8579
--- /dev/null
+++ b/src/lib/process/daemon.cc
@@ -0,0 +1,265 @@
+// Copyright (C) 2014-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <process/daemon.h>
+#include <process/log_parser.h>
+#include <exceptions/exceptions.h>
+#include <log/logger_name.h>
+#include <log/logger_support.h>
+#include <process/config_base.h>
+#include <process/redact_config.h>
+#include <util/filename.h>
+
+#include <functional>
+#include <sstream>
+#include <fstream>
+
+#include <errno.h>
+
+using namespace isc::data;
+namespace ph = std::placeholders;
+
+/// @brief provides default implementation for basic daemon operations
+///
+/// This file provides stub implementations that are expected to be redefined
+/// in derived classes (e.g. ControlledDhcpv6Srv)
+namespace isc {
+namespace process {
+
+bool Daemon::verbose_ = false;
+
+std::string Daemon::proc_name_("");
+
+std::string Daemon::default_logger_name_("kea");
+
+Daemon::Daemon()
+    : signal_set_(), config_file_(""),
+      pid_file_dir_(DATA_DIR), pid_file_(), am_file_author_(false),
+      exit_value_(EXIT_SUCCESS) {
+
+    // The pid_file_dir can be overridden via environment variable
+    // This is primarily intended to simplify testing
+    const char* const env = getenv("KEA_PIDFILE_DIR");
+    if (env) {
+        pid_file_dir_ = env;
+    }
+}
+
+Daemon::~Daemon() {
+    if (pid_file_ && am_file_author_) {
+        pid_file_->deleteFile();
+    }
+}
+
+void Daemon::cleanup() {
+}
+
+void Daemon::shutdown() {
+}
+
+void Daemon::configureLogger(const ConstElementPtr& log_config,
+                             const ConfigPtr& storage) {
+
+    if (log_config) {
+        ConstElementPtr loggers = log_config->get("loggers");
+        if (loggers) {
+            LogConfigParser parser(storage);
+            parser.parseConfiguration(loggers, verbose_);
+        }
+    }
+}
+
+void
+Daemon::setVerbose(bool verbose) {
+    verbose_ = verbose;
+}
+
+bool
+Daemon::getVerbose() {
+    return (verbose_);
+}
+
+void Daemon::loggerInit(const char* name, bool verbose) {
+
+    setenv("KEA_LOGGER_DESTINATION", "stdout", 0);
+
+    // Initialize logger system
+    isc::log::initLogger(name, isc::log::DEBUG, isc::log::MAX_DEBUG_LEVEL, 0);
+
+    // Apply default configuration (log INFO or DEBUG to stdout)
+    isc::log::setDefaultLoggingOutput(verbose);
+}
+
+std::string Daemon::getVersion(bool /*extended*/) {
+    isc_throw(isc::NotImplemented, "Daemon::getVersion() called");
+}
+
+std::string
+Daemon::getConfigFile() const {
+    return (config_file_);
+}
+
+void
+Daemon::setConfigFile(const std::string& config_file) {
+    config_file_ = config_file;
+}
+
+void
+Daemon::checkConfigFile() const {
+    if (config_file_.empty()) {
+        isc_throw(isc::BadValue, "config file name is not set");
+    }
+
+    // Create Filename instance from the config_file_ pathname, and
+    // check the file name component.
+    isc::util::Filename file(config_file_);
+    if (file.name().empty()) {
+        isc_throw(isc::BadValue, "config file:" << config_file_
+                  << " is missing file name");
+    }
+}
+
+std::string
+Daemon::getProcName() {
+    return (proc_name_);
+};
+
+void
+Daemon::setProcName(const std::string& proc_name) {
+    proc_name_ = proc_name;
+}
+
+std::string
+Daemon::getPIDFileDir() const {
+    return(pid_file_dir_);
+}
+
+void
+Daemon::setPIDFileDir(const std::string& pid_file_dir) {
+    pid_file_dir_ = pid_file_dir;
+}
+
+std::string
+Daemon::getPIDFileName() const {
+    if (pid_file_) {
+        return (pid_file_->getFilename());
+    }
+
+    return ("");
+};
+
+void
+Daemon::setPIDFileName(const std::string& pid_file_name) {
+    if (pid_file_) {
+        isc_throw(isc::InvalidOperation, "Daemon::setConfigFile"
+                  " file name already set to:" << pid_file_->getFilename());
+    }
+
+    if (pid_file_name.empty()) {
+        isc_throw(isc::BadValue, "Daemon::setPIDFileName"
+                  " file name may not be empty");
+    }
+
+    pid_file_.reset(new util::PIDFile(pid_file_name));
+};
+
+std::string
+Daemon::makePIDFileName() const {
+    if (config_file_.empty()) {
+        isc_throw(isc::InvalidOperation,
+                  "Daemon::makePIDFileName config file name is not set");
+    }
+
+    // Create Filename instance from the config_file_ pathname, so we can
+    // extract the fname component.
+    isc::util::Filename file(config_file_);
+    if (file.name().empty()) {
+        isc_throw(isc::BadValue, "Daemon::makePIDFileName config file:"
+                  << config_file_ << " is missing file name");
+    }
+
+    if (proc_name_.empty()) {
+        isc_throw(isc::InvalidOperation,
+                  "Daemon::makePIDFileName process name is not set");
+    }
+
+    // Make the pathname for the PID file from the runtime directory,
+    // configuration name and process name.
+    std::ostringstream stream;
+    stream  << pid_file_dir_ << "/" << file.name()
+            << "." << proc_name_ << ".pid";
+
+    return(stream.str());
+};
+
+void
+Daemon::createPIDFile(int pid) {
+    // If pid_file_ hasn't been instantiated explicitly, then do so
+    // using the default name.
+    if (!pid_file_) {
+        setPIDFileName(makePIDFileName());
+    }
+
+    // If we find a pre-existing file containing a live PID we bail.
+    int chk_pid = pid_file_->check();
+    if (chk_pid > 0) {
+        isc_throw(DaemonPIDExists, "Daemon::createPIDFile: PID: " << chk_pid
+                 << " exists, PID file: " << getPIDFileName());
+    }
+
+    if (pid == 0) {
+        // Write the PID of the current process
+        pid_file_->write();
+    } else {
+        // Write the PID we were given
+        pid_file_->write(pid);
+    }
+
+    am_file_author_ = true;
+}
+
+size_t
+Daemon::writeConfigFile(const std::string& config_file,
+                        ConstElementPtr cfg) const {
+    if (!cfg) {
+        isc_throw(Unexpected, "Can't write configuration: conversion to JSON failed");
+    }
+
+    std::ofstream out(config_file, std::ios::trunc);
+    if (!out.good()) {
+        isc_throw(Unexpected, "Unable to open file " + config_file + " for writing");
+    }
+
+    // Write the actual content using pretty printing.
+    prettyPrint(cfg, out);
+
+    size_t bytes = static_cast<size_t>(out.tellp());
+
+    out.close();
+
+    return (bytes);
+}
+
+std::list<std::list<std::string>>
+Daemon::jsonPathsToRedact() const {
+    static std::list<std::list<std::string>> const list;
+    return list;
+}
+
+isc::data::ConstElementPtr
+Daemon::redactConfig(isc::data::ConstElementPtr const& config) {
+    isc::data::ConstElementPtr result(config);
+    for (std::list<std::string>& json_path : jsonPathsToRedact()) {
+        result = isc::process::redactConfig(result, json_path);
+    }
+    return result;
+}
+
+}  // namespace process
+}  // namespace isc
diff --git a/src/lib/process/daemon.h b/src/lib/process/daemon.h
new file mode 100644
index 0000000..d64445a
--- /dev/null
+++ b/src/lib/process/daemon.h
@@ -0,0 +1,296 @@
+// Copyright (C) 2014-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DAEMON_H
+#define DAEMON_H
+
+#include <cc/data.h>
+#include <process/config_base.h>
+#include <util/pid_file.h>
+#include <asiolink/io_service_signal.h>
+
+#include <boost/noncopyable.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+#include <list>
+#include <string>
+
+namespace isc {
+namespace process {
+
+/// @brief Exception thrown when the PID file points to a live PID
+class DaemonPIDExists : public Exception {
+public:
+    DaemonPIDExists(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) { };
+};
+
+/// @brief Base class for all services
+///
+/// This is the base class that all daemons (DHCPv4, DHCPv6, D2 and possibly
+/// others) are derived from. It provides a standard interface for starting up,
+/// reconfiguring, shutting down and several other operations. It also covers
+/// some common operations.
+///
+/// This class is not expected to be instantiated directly, but rather daemon
+/// implementations should derive from it.
+///
+/// Methods are not pure virtual, as we need to instantiate basic daemons (e.g.
+/// Dhcpv4Srv and Dhcpv6Srv) in tests, without going through the hassles of
+/// implementing stub methods.
+///
+/// @note Only one instance of this class is instantiated as it encompasses
+///       the whole operation of the server.  Nothing, however, enforces the
+///       singleton status of the object.
+class Daemon : public boost::noncopyable {
+
+public:
+    /// @brief Default constructor
+    ///
+    /// Initializes the object installing custom signal handlers for the
+    /// process to NULL.
+    Daemon();
+
+    /// @brief Destructor
+    ///
+    /// Having virtual destructor ensures that all derived classes will have
+    /// virtual destructor as well.
+    virtual ~Daemon();
+
+    /// @brief Performs final deconfiguration.
+    ///
+    /// Performs configuration backend specific final clean-up. This is called
+    /// shortly before the daemon terminates. Depending on backend, it may
+    /// terminate existing msgq session, close LDAP connection or similar.
+    ///
+    /// The daemon is not expected to receive any further commands or
+    /// configuration updates as it is in final stages of shutdown.
+    virtual void cleanup();
+
+    /// @brief Initiates shutdown procedure for the whole server.
+    virtual void shutdown();
+
+    /// @brief Initializes logger
+    ///
+    /// This method initializes logging system. It also sets the default
+    /// output to stdout. This is used in early stages of the startup
+    /// phase before config file and parsed and proper logging details
+    /// are known.
+    ///
+    /// @param log_name name used in logger initialization
+    /// @param verbose verbose mode (true usually enables DEBUG messages)
+    static void loggerInit(const char* log_name, bool verbose);
+
+    /// @brief Configures logger
+    ///
+    /// Applies configuration stored in a top-level structure in the
+    /// configuration file. This structure has a "loggers" array that
+    /// contains 0 or more entries, each configuring one logging source
+    /// (name, severity, debuglevel), each with zero or more outputs (file,
+    /// maxsize, maximum number of files).
+    ///
+    /// @param log_config JSON structures that describe logging
+    /// @param storage configuration will be stored here
+    static void configureLogger(const isc::data::ConstElementPtr& log_config,
+                                const isc::process::ConfigPtr& storage);
+
+    /// @brief Sets or clears verbose mode
+    ///
+    /// Verbose mode (-v in command-line) triggers loggers to log everything
+    /// (sets severity to DEBUG and debuglevel to 99). Values specified in the
+    /// config file are ignored.
+    ///
+    /// @param verbose specifies if verbose should be set or not
+    static void setVerbose(const bool verbose);
+
+    /// @brief Returns if running in verbose mode
+    ///
+    /// @return verbose mode
+    static bool getVerbose();
+
+    /// @brief returns Kea version on stdout and exits.
+    ///
+    /// With extended == false, this method returns a simple string
+    /// containing version number. With extended == true, it returns
+    /// also additional information about sources. It is expected to
+    /// return extra information about dependencies and used DB backends.
+    ///
+    /// As there is no static virtual methods in C++ this class method
+    /// has to be redefined in derived classes and called with the
+    /// derived class name or a child name.
+    ///
+    /// @param extended print additional information?
+    /// @return text string
+    static std::string getVersion(bool extended);
+
+    /// @brief Returns config file name.
+    /// @return text string
+    std::string getConfigFile() const;
+
+    /// @brief Sets the configuration file name
+    ///
+    /// @param config_file pathname of the configuration file
+    void setConfigFile(const std::string& config_file);
+
+    /// @brief Checks the configuration file name.
+    /// @throw BadValue when the configuration file name is bad.
+    void checkConfigFile() const;
+
+    /// @brief Writes current configuration to specified file
+    ///
+    /// This method writes the current configuration to specified file.
+    /// @todo: this logically more belongs to CPL process file. Once
+    /// Daemon is merged with CPL architecture, it will be a better
+    /// fit.
+    ///
+    /// If cfg is not specified, the current config (as returned by
+    /// CfgMgr::instance().getCurrentCfg() will be returned.
+    ///
+    /// @param config_file name of the file to write the configuration to
+    /// @param cfg configuration to write (optional)
+    /// @return number of files written
+    /// @throw Unexpected if CfgMgr can't retrieve configuration or file cannot
+    ///                   be written
+    virtual size_t
+    writeConfigFile(const std::string& config_file,
+                    isc::data::ConstElementPtr cfg = isc::data::ConstElementPtr()) const;
+
+    /// @brief returns the process name
+    /// This value is used as when forming the default PID file name
+    /// @return text string
+    static std::string getProcName();
+
+    /// @brief Sets the process name
+    /// @param proc_name name the process by which the process is recognized
+    static void setProcName(const std::string& proc_name);
+
+    /// @brief Returns the directory used when forming default PID file name
+    /// @return text string
+    std::string getPIDFileDir() const;
+
+    /// @brief Sets the PID file directory
+    /// @param pid_file_dir path into which the PID file should be written
+    /// Note the value should not include a trailing slash, '/'
+    void setPIDFileDir(const std::string& pid_file_dir);
+
+    /// @brief Returns the current PID file name
+    /// @return text string
+    std::string getPIDFileName() const;
+
+    /// @brief Sets PID file name
+    ///
+    /// If this method is called prior to calling createPIDFile,
+    /// the value passed in will be treated as the full file name
+    /// for the PID file.  This provides a means to override the
+    /// default file name with an explicit value.
+    ///
+    /// @param pid_file_name file name to be used as the PID file
+    void setPIDFileName(const std::string& pid_file_name);
+
+    /// @brief Creates the PID file
+    ///
+    /// If the PID file name has not been previously set, the method
+    /// uses manufacturePIDFileName() to set it.  If the PID file
+    /// name refers to an existing file whose contents are a PID whose
+    /// process is still alive, the method will throw a DaemonPIDExists
+    /// exception.  Otherwise, the file created (or truncated) and
+    /// the given pid (if not zero) is written to the file.
+    ///
+    /// @param pid PID to write to the file if not zero, otherwise the
+    /// PID of the current process is used.
+    void createPIDFile(int pid = 0);
+
+    /// @brief Returns default logger name.
+    static std::string getDefaultLoggerName() {
+        return (default_logger_name_);
+    }
+
+    /// @brief Sets the default logger name.
+    ///
+    /// This name is used in cases when a user doesn't provide a configuration
+    /// for logger in the Kea configuration file.
+    static void setDefaultLoggerName(const std::string& logger) {
+        default_logger_name_ = logger;
+    }
+
+    /// @brief Fetches the exit value.
+    int getExitValue() {
+        return (exit_value_);
+    }
+
+    /// @brief Sets the exit value.
+    ///
+    /// @param value new exit value.
+    void setExitValue(int value) {
+        exit_value_ = value;
+    }
+
+    /// @brief Return a list of all paths that contain passwords or secrets.
+    ///
+    /// Used in @ref isc::process::Daemon::redactConfig to only make copies and
+    /// only redact configuration subtrees that contain passwords or secrets. To
+    /// be overridden by derived classes.
+    ///
+    /// @return the list of lists of sequential JSON map keys needed to reach
+    /// the passwords and secrets.
+    virtual std::list<std::list<std::string>> jsonPathsToRedact() const;
+
+    /// @brief Redact a configuration.
+    ///
+    /// Calls @ref isc::process::redactConfig
+    ///
+    /// @param config the Element tree structure that describes the configuration.
+    ///
+    /// @return the redacted configuration
+    isc::data::ConstElementPtr redactConfig(isc::data::ConstElementPtr const& config);
+
+protected:
+
+    /// @brief A pointer to the object installing custom signal handlers.
+    ///
+    /// This pointer needs to be initialized to point to the @c IOSignalSet
+    /// object in the derived classes which need to handle signals received
+    /// by the process.
+    isc::asiolink::IOSignalSetPtr signal_set_;
+
+    /// @brief Manufacture the pid file name
+    std::string makePIDFileName() const;
+
+    /// @brief Timestamp of the start of the daemon.
+    boost::posix_time::ptime start_;
+
+private:
+    /// @brief Config file name or empty if config file not used.
+    std::string config_file_;
+
+    /// @brief Name of this process, used when creating its pid file
+    static std::string proc_name_;
+
+    /// @brief Pointer to the directory where PID file(s) are written
+    /// It defaults to --localstatedir / run
+    std::string pid_file_dir_;
+
+    /// @brief Pointer to the PID file for this process
+    isc::util::PIDFilePtr pid_file_;
+
+    /// @brief Indicates whether verbose mode is turned on or not.
+    static bool verbose_;
+
+    /// @brief Stores default logger name
+    static std::string default_logger_name_;
+
+    /// @brief Flag indicating if this instance created the file
+    bool am_file_author_;
+
+    /// @brief Exit value the process should use.  Typically set
+    /// by the application during a controlled shutdown.
+    int exit_value_;
+};
+
+} // namespace process
+} // namespace isc
+
+#endif
diff --git a/src/lib/process/libprocess.dox b/src/lib/process/libprocess.dox
new file mode 100644
index 0000000..2ea2e5c
--- /dev/null
+++ b/src/lib/process/libprocess.dox
@@ -0,0 +1,195 @@
+// Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+ @page libprocess libkea-process - Controllable Process Layer (CPL)
+
+@section cpl Controllable Process Layer (CPL)
+During the design and development of D2 (Kea's DHCP-DDNS process), an abstract
+layer for process control, called the Controllable Process Layer or CPL, was
+created.  Kea's DHCP servers were initially developed prior to D2 and thus
+before CPL existed.
+
+Out of short term convenience and the fact that only D2 was using it, the CPL
+was initially developed as part of D2 in src/bin/d2.  In order to use CPL for
+new Kea processes, it has since been moved into its own library, libkea-process.
+The following sections describe the architecture of CPL and how it can be used to implement new daemons in Kea.
+
+The CPL provides the essentials for a controllable, configurable,
+asynchronous process.  They are the result of an effort to distill the
+common facets of process control currently duplicated in Kea's
+DHCP servers into a reusable construct.  The classes which form this abstract
+base are shown in the following class diagram:
+
+@image html abstract_app_classes.svg  "Controllable Process Layer Classes"
+
+- isc::process::DControllerBase - provides all of the services necessary to manage
+an application process class derived from isc::d2::DProcess. These services include:
+    - Command line argument handling
+    - Process instantiation and initialization
+    - Support for stand-alone execution
+    - Process event loop invocation and shutdown
+
+    It creates and manages an instance of isc::process::DProcessBase.  The CPL is
+    designed for asynchronous event processing applications.  It is constructed
+    to use ASIO library for IO processing.  @c DControllerBase owns an
+    isc::asiolink::IOService instance and it passes this into the @c
+    DProcessBase constructor. It is this @c IOService that is used to drive the
+    process's event loop.  The controller is designed to provide any interfaces
+    between the process it controls and the outside world.
+
+    @c DControllerBase provides configuration for its process via a JSON file
+    specified as a mandatory command line argument. The file structure is
+    expected be as follows:
+
+    { "<module-name>": {<module-config>} }
+
+    where:
+        - module-name : is a label which uniquely identifies the
+        configuration data for the (i.e. the controlled process.)
+        It is the value returned by @ref
+        isc::process::DControllerBase::getAppName()
+
+        - module-config: a set of zero or more JSON elements which comprise
+        application's configuration values.  Element syntax is governed
+        by those elements supported in isc::cc.
+
+    The file may contain an arbitrary number of other modules.
+
+    @todo Eventually, some sort of secure socket interface which supports remote
+    control operations such as configuration changes or status reporting will
+    likely be implemented.
+
+- isc::process::DProcessBase - defines an asynchronous-event processor (i.e.
+application) which provides a uniform interface to:
+    - Instantiate and initialize a process instance
+    - "Run" the application by starting its event loop
+    - Inject events to control the process
+It owns an instance of @c DCfgMgrBase.
+
+- isc::process::DCfgMgrBase - provides the mechanisms for managing an application's
+configuration.  This includes services for parsing sets of configuration
+values, storing the parsed information in its converted form, and retrieving
+the information on demand.  It owns an instance of @c DCfgContextBase, which
+provides a "global" context for information that is accessible before, during,
+and after parsing.
+
+- isc::process::DCfgContextBase - implements a container for configuration
+information or "context".  It provides a single enclosure for the storage of
+configuration parameters or any other information that needs to accessible
+within a given context.
+
+The following sequence diagram shows how a configuration from file moves
+through the CPL layer:
+
+@image html config_from_file_sequence.svg "CPL Configuration From File Sequence"
+
+The CPL classes will likely move into a common library.
+
+@section cplSignals CPL Signal Handling
+
+CPL supports interaction with the outside world via OS signals. The default
+implementation supports the following signal driven behavior:
+- SIGHUP receipt of this signal will cause a reloading of the configuration
+file.
+- SIGINT/SIGTERM receipt of either of these signals will initiate an
+orderly shutdown.
+
+CPL applications wait for for process asynchronous IO events through
+isc::asiolink::IOService::run() or its variants.  These calls are not
+interrupted upon signal receipt as is the select() function and while
+boost::asio provides a signal mechanism it requires linking in additional
+libraries.  Therefore, CPL provides its own signal handling mechanism to
+propagate an OS signal such as SIGHUP to an IOService as a ready event with a
+callback.
+
+isc::process::DControllerBase uses two mechanisms to carry out signal handling.  It
+uses isc::util::SignalSet to catch OS signals, and isc::process::IOSignalQueue to
+propagate them to its isc::asiolink::IOService as instances of
+isc::process::IOSignal.
+
+This CPL signaling class hierarchy is illustrated in the following diagram:
+
+@image html cpl_signal_classes.svg "CPL Signal Classes"
+
+The mechanics of isc::process::IOSignal are straight forward. Upon construction it
+is given the target isc::asiolink::IOService, the value of the OS signal to
+send (e.g. SIGINT, SIGHUP...), and an isc::process::IOSignalHandler.  This handler
+should contain the logic the caller would normally execute in its OS signal
+handler. Each isc::process::IOSignal instance has a unique identifier called its
+sequence_id.
+
+Internally, IOSignal creates a 1 ms, one-shot timer, on the given
+IOService.  When the timer expires its event handler invokes the caller's
+IOSignalHandler passing it the sequence_id of the IOSignal.
+
+Sending IOSignals is done through an isc::process::IOSignalQueue.  This class is
+used to create the signals, house them until they are delivered, and dequeue
+them so they can be been handled.  To generate an IOSignal when an OS signal
+arrives, the process's OS signal handler need only call
+isc::process::IOSignalQueue::pushSignal() with the appropriate values.
+
+To dequeue the IOSignal inside the caller's IOSignalHandler, one simply
+invokes isc::process::IOSignalQueue::popSignal() passing it the sequence_id
+parameter passed to the handler.  This method returns a pointer to
+instigating IOSignal from which the value of OS signal (i.e. SIGINT,
+SIGUSR1...) can be obtained.  Note that calling popSignal() removes the
+IOSignalPtr from the queue, which should reduce its reference count to
+zero upon exiting the handler (unless a deliberate copy of it is made).
+
+A typical isc::process::IOSignalHandler might be structured as follows:
+@code
+
+    void processSignal(IOSignalId sequence_id) {
+    // Pop the signal instance off the queue.
+    IOSignalPtr signal = io_signal_queue_->popSignal(sequence_id);
+
+    int os_signal_value = signal->getSignum();
+    :
+    // logic based on the signal value
+    :
+    }
+
+@endcode
+
+IOSignal's handler invocation code will catch, log ,and then swallow any
+exceptions thrown by an IOSignalHandler.  This is done to protect the integrity
+IOService context.
+
+The following sequence diagram depicts the initialization of signal handling
+during startup and the subsequent receipt of a SIGHUP:
+
+@image html cpl_signal_sequence.svg "CPL Signal Handling Sequence"
+
+@section redact Redact Passwords
+
+There are two tools to remove sensitive data as passwords or secrets from logs:
+ - redactedAccessString for database access strings
+ - redactConfig for full configurations
+
+The jsonPathsToRedact method must be defined in derived classes following this
+procedure:
+ - Get all possible JSON paths from the root of the configuration to leaves that
+ fulfill the role of map keys and which contain "password" or "secret".
+ - For each of these paths, remove the root node and the leaf node.
+ - Include all the paths in the method. Duplicate subpaths are expected in the
+ case of common subpaths to different leaves.
+
+There are two special syntaxes:
+ - "[]" suggests that the searched element is a list. This is required for all
+ lists and is for performance gain.
+ - "*" as a last element in a JSON path tells the redacter to look in all
+ elements that follow for elements that contain "password" and "secret". This is
+ when the particular configuration that is targeted by the "*" does not have a
+ well defined structure, such as is the case for "parameters" in the
+ "hooks-libraries" map in "Dhcp4" and "Dhcp6".
+
+@section cplMTConsiderations Multi-Threading Consideration for Controllable Process Layer
+
+By default this library is not thread safe and currently there is no known
+exception.
+
+*/
diff --git a/src/lib/process/log_parser.cc b/src/lib/process/log_parser.cc
new file mode 100644
index 0000000..258aa4e
--- /dev/null
+++ b/src/lib/process/log_parser.cc
@@ -0,0 +1,158 @@
+// Copyright (C) 2014-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/data.h>
+#include <process/log_parser.h>
+#include <boost/foreach.hpp>
+#include <boost/lexical_cast.hpp>
+#include <log/logger_specification.h>
+#include <log/logger_support.h>
+#include <log/logger_manager.h>
+#include <log/logger_name.h>
+
+using namespace isc::data;
+using namespace isc::log;
+
+namespace isc {
+namespace process {
+
+LogConfigParser::LogConfigParser(const ConfigPtr& storage)
+    :config_(storage), verbose_(false) {
+    if (!storage) {
+        isc_throw(BadValue, "LogConfigParser needs a pointer to the "
+                  "configuration, so parsed data can be stored there");
+    }
+}
+
+void LogConfigParser::parseConfiguration(const isc::data::ConstElementPtr& loggers,
+                                         bool verbose) {
+    verbose_ = verbose;
+
+    // Iterate over all entries in "Server/loggers" list
+    BOOST_FOREACH(ConstElementPtr logger, loggers->listValue()) {
+        parseConfigEntry(logger);
+    }
+}
+
+void LogConfigParser::parseConfigEntry(isc::data::ConstElementPtr entry) {
+    if (!entry) {
+        // This should not happen, but let's be on the safe side and check
+        return;
+    }
+
+    if (!config_) {
+        isc_throw(BadValue, "configuration storage not set, can't parse logger config.");
+    }
+
+    LoggingInfo info;
+    // Remove default destinations as we are going to replace them.
+    info.clearDestinations();
+
+    // Get user context
+    isc::data::ConstElementPtr user_context = entry->get("user-context");
+    if (user_context) {
+        info.setContext(user_context);
+    }
+
+    // Get a name
+    isc::data::ConstElementPtr name_ptr = entry->get("name");
+    if (!name_ptr) {
+        isc_throw(BadValue, "loggers entry does not have a mandatory 'name' "
+                  "element (" << entry->getPosition() << ")");
+    }
+    info.name_ = name_ptr->stringValue();
+
+    // Get the severity.
+    // If not configured, set it to DEFAULT to inherit it from the root logger later.
+    isc::data::ConstElementPtr severity_ptr = entry->get("severity");
+    if (severity_ptr) {
+        info.severity_ = getSeverity(severity_ptr->stringValue());
+    } else {
+        info.severity_ = DEFAULT;
+    }
+
+    // Get debug logging level
+    info.debuglevel_ = 0;
+    isc::data::ConstElementPtr debuglevel_ptr = entry->get("debuglevel");
+
+    // It's ok to not have debuglevel, we'll just assume its least verbose
+    // (0) level.
+    if (debuglevel_ptr) {
+        try {
+            info.debuglevel_ = boost::lexical_cast<int>(debuglevel_ptr->str());
+            if ( (info.debuglevel_ < 0) || (info.debuglevel_ > 99) ) {
+                // Comment doesn't matter, it is caught several lines below
+                isc_throw(BadValue, "");
+            }
+        } catch (...) {
+            isc_throw(BadValue, "Unsupported debuglevel value '"
+                      << debuglevel_ptr->stringValue()
+                      << "', expected 0-99 ("
+                      << debuglevel_ptr->getPosition() << ")");
+        }
+    }
+
+    // We want to follow the normal path, so it could catch parsing errors even
+    // when verbose mode is enabled. If it is, just override whatever was parsed
+    // in the config file.
+    if (verbose_) {
+        info.severity_ = isc::log::DEBUG;
+        info.debuglevel_ = 99;
+    }
+
+    isc::data::ConstElementPtr output_options = entry->get("output_options");
+
+    if (output_options) {
+        parseOutputOptions(info.destinations_, output_options);
+    }
+
+    config_->addLoggingInfo(info);
+}
+
+void LogConfigParser::parseOutputOptions(std::vector<LoggingDestination>& destination,
+                                         isc::data::ConstElementPtr output_options) {
+    if (!output_options) {
+        isc_throw(BadValue, "Missing 'output_options' structure in 'loggers'");
+    }
+
+    BOOST_FOREACH(ConstElementPtr output_option, output_options->listValue()) {
+
+        LoggingDestination dest;
+
+        isc::data::ConstElementPtr output = output_option->get("output");
+        if (!output) {
+            isc_throw(BadValue, "output_options entry does not have a mandatory 'output' "
+                      "element (" << output_option->getPosition() << ")");
+        }
+        dest.output_ = output->stringValue();
+
+        isc::data::ConstElementPtr maxver_ptr = output_option->get("maxver");
+        if (maxver_ptr) {
+            dest.maxver_ = boost::lexical_cast<int>(maxver_ptr->str());
+        }
+
+        isc::data::ConstElementPtr maxsize_ptr = output_option->get("maxsize");
+        if (maxsize_ptr) {
+            dest.maxsize_ = boost::lexical_cast<uint64_t>(maxsize_ptr->str());
+        }
+
+        isc::data::ConstElementPtr flush_ptr = output_option->get("flush");
+        if (flush_ptr) {
+            dest.flush_ = flush_ptr->boolValue();
+        }
+
+        isc::data::ConstElementPtr pattern = output_option->get("pattern");
+        if (pattern) {
+            dest.pattern_ = pattern->stringValue();
+        }
+
+        destination.push_back(dest);
+    }
+}
+
+} // namespace isc::dhcp
+} // namespace isc
diff --git a/src/lib/process/log_parser.h b/src/lib/process/log_parser.h
new file mode 100644
index 0000000..92209bd
--- /dev/null
+++ b/src/lib/process/log_parser.h
@@ -0,0 +1,93 @@
+// Copyright (C) 2014-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DHCPSRV_LOGGING_H
+#define DHCPSRV_LOGGING_H
+
+#include <cc/data.h>
+#include <process/logging_info.h>
+#include <process/config_base.h>
+#include <vector>
+
+namespace isc {
+namespace process {
+
+/// @brief Configures log4cplus by translating Kea configuration structures
+///
+/// This parser iterates over provided data elements and translates them
+/// into values applicable to log4cplus.
+///
+/// The data structures converted to JSON format have the following syntax:
+/// {
+///     "name": "kea",
+///     "output_options": [
+///         {
+///             "output": "/home/thomson/kea-inst/kea-warn.log",
+///             "maxver": 8,
+///             "maxsize": 204800,
+///             "flush": true
+///         }
+///     ],
+///     "severity": "WARN"
+/// }
+///
+/// This is only an example and actual values may be different.
+///
+/// The data structures don't have to originate from JSON. JSON is just a
+/// convenient presentation syntax.
+///
+/// This class uses @c ConfigBase object to store logging configuration.
+class LogConfigParser {
+public:
+
+    /// @brief Constructor
+    ///
+    /// @param storage parsed logging configuration will be stored here
+    LogConfigParser(const ConfigPtr& storage);
+
+    /// @brief Parses specified configuration
+    ///
+    /// Walks over specified logging configuration JSON structures and store
+    /// parsed information in config_->logging_info_.
+    ///
+    /// @param log_config JSON structures to be parsed (loggers list)
+    /// @param verbose specifies verbose mode (true forces DEBUG, debuglevel = 99)
+    void parseConfiguration(const isc::data::ConstElementPtr& log_config,
+                            bool verbose = false);
+
+private:
+
+    /// @brief Parses one JSON structure in Server/loggers" array
+    ///
+    /// @param entry JSON structure to be parsed
+    /// @brief parses one structure in Server/loggers.
+    void parseConfigEntry(isc::data::ConstElementPtr entry);
+
+    /// @brief Parses output_options structure
+    ///
+    /// @ref @c LogConfigParser for an example in JSON format.
+    ///
+    /// @param destination parsed parameters will be stored here
+    /// @param output_options element to be parsed
+    void parseOutputOptions(std::vector<LoggingDestination>& destination,
+                            isc::data::ConstElementPtr output_options);
+
+    /// @brief Configuration is stored here
+    ///
+    /// LogConfigParser class uses only config_->logging_info_ field.
+    ConfigPtr config_;
+
+    /// @brief Verbose mode
+    ///
+    /// When verbose mode is enabled, logging severity is overridden to DEBUG,
+    /// and debuglevel is always 99.
+    bool verbose_;
+};
+
+} // namespace isc::dhcp
+} // namespace isc
+
+#endif // DHCPSRV_LOGGING_H
diff --git a/src/lib/process/logging_info.cc b/src/lib/process/logging_info.cc
new file mode 100644
index 0000000..a32119d
--- /dev/null
+++ b/src/lib/process/logging_info.cc
@@ -0,0 +1,212 @@
+// Copyright (C) 2014-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <process/logging_info.h>
+#include <process/daemon.h>
+#include <log/logger_name.h>
+
+using namespace isc::log;
+using namespace isc::data;
+
+namespace isc {
+namespace process {
+
+static const std::string STDOUT = "stdout";
+static const std::string STDERR = "stderr";
+static const std::string SYSLOG = "syslog";
+static const std::string SYSLOG_COLON = "syslog:";
+
+bool
+LoggingDestination::equals(const LoggingDestination& other) const {
+    return (output_ == other.output_ &&
+            maxver_ == other.maxver_ &&
+            maxsize_ == other.maxsize_ &&
+            flush_ == other.flush_ &&
+            pattern_ == other.pattern_);
+}
+
+ElementPtr
+LoggingDestination::toElement() const {
+    ElementPtr result = Element::createMap();
+
+    // Set output
+    result->set("output", Element::create(output_));
+
+    // Set flush
+    result->set("flush", Element::create(flush_));
+
+    // Set pattern
+    result->set("pattern", Element::create(pattern_));
+
+    if ((output_ != STDOUT) && (output_ != STDERR) && (output_ != SYSLOG) &&
+        (output_.find(SYSLOG_COLON) == std::string::npos)) {
+        // Set maxver
+        result->set("maxver", Element::create(maxver_));
+
+        // Set maxsize
+        result->set("maxsize", Element::create(static_cast<long long>(maxsize_)));
+    }
+
+    return (result);
+}
+
+LoggingInfo::LoggingInfo()
+    : name_("kea"), severity_(isc::log::INFO), debuglevel_(0) {
+    // If configuration Manager is in the verbose mode, we need to modify the
+    // default settings.
+    if (Daemon::getVerbose()) {
+        severity_ = isc::log::DEBUG;
+        debuglevel_ = 99;
+    }
+
+    // If the process has set the non-empty name for the default logger,
+    // let's use this name.
+    std::string default_logger = Daemon::getDefaultLoggerName();
+    if (!default_logger.empty()) {
+        name_ = default_logger;
+    }
+
+    // Add a default logging destination in case use hasn't provided a
+    // logger specification.
+    LoggingDestination dest;
+    dest.output_ = "stdout";
+    destinations_.push_back(dest);
+}
+
+bool
+LoggingInfo::equals(const LoggingInfo& other) const {
+    // If number of destinations aren't equal, the objects are not equal.
+    if (destinations_.size() != other.destinations_.size()) {
+        return (false);
+    }
+    // If there is the same number of logging destinations verify that the
+    // destinations are equal. The order doesn't matter to we don't expect
+    // that they are at the same index of the vectors.
+    for (auto const& dest : destinations_) {
+        bool match = false;
+        for (auto const &dest_other : other.destinations_) {
+            if (dest.equals(dest_other)) {
+                match = true;
+                break;
+            }
+        }
+        if (!match) {
+            return (false);
+        }
+    }
+
+    // Logging destinations are equal. Check the rest of the parameters for
+    // equality.
+    return (name_ == other.name_ &&
+            severity_ == other.severity_ &&
+            debuglevel_ == other.debuglevel_);
+}
+
+LoggerSpecification
+LoggingInfo::toSpec() const {
+    LoggerSpecification spec(name_, severity_, debuglevel_);
+
+    // Go over logger destinations and create output options accordingly.
+    for (auto const& dest : destinations_) {
+        OutputOption option;
+        // Set up output option according to destination specification
+        if (dest.output_ == STDOUT) {
+            option.destination = OutputOption::DEST_CONSOLE;
+            option.stream = OutputOption::STR_STDOUT;
+
+        } else if (dest.output_ == STDERR) {
+            option.destination = OutputOption::DEST_CONSOLE;
+            option.stream = OutputOption::STR_STDERR;
+
+        } else if (dest.output_ == SYSLOG) {
+            option.destination = OutputOption::DEST_SYSLOG;
+            // Use default specified in OutputOption constructor for the
+            // syslog destination
+
+        } else if (dest.output_.find(SYSLOG_COLON) == 0) {
+            option.destination = OutputOption::DEST_SYSLOG;
+            // Must take account of the string actually being "syslog:"
+            if (dest.output_ == SYSLOG_COLON) {
+                // The expected syntax is syslog:facility. User skipped
+                // the logging name, so we'll just use the default ("kea")
+                option.facility = isc::log::getDefaultRootLoggerName();
+
+            } else {
+                // Everything else in the string is the facility name
+                option.facility = dest.output_.substr(SYSLOG_COLON.size());
+            }
+
+        } else {
+            // Not a recognized destination, assume a file.
+            option.destination = OutputOption::DEST_FILE;
+            option.filename = dest.output_;
+            option.maxsize = dest.maxsize_;
+            option.maxver = dest.maxver_;
+        }
+
+        // Copy the immediate flush flag
+        option.flush = dest.flush_;
+
+        // Copy the pattern
+        option.pattern = dest.pattern_;
+
+        // ... and set the destination
+        spec.addOutputOption(option);
+    }
+
+    return (spec);
+}
+
+ElementPtr
+LoggingInfo::toElement() const {
+    ElementPtr result = Element::createMap();
+    // Set user context
+    contextToElement(result);
+    // Set name
+    result->set("name", Element::create(name_));
+    // Set output_options if not empty
+    if (!destinations_.empty()) {
+        ElementPtr options = Element::createList();
+        for (auto const& dest : destinations_) {
+            options->add(dest.toElement());
+        }
+        result->set("output_options", options);
+    }
+    // Set severity
+    std::string severity;
+    switch (severity_) {
+    case isc::log::DEBUG:
+        severity = "DEBUG";
+        break;
+    case isc::log::INFO:
+        severity = "INFO";
+        break;
+    case isc::log::WARN:
+        severity = "WARN";
+        break;
+    case isc::log::ERROR:
+        severity = "ERROR";
+        break;
+    case isc::log::FATAL:
+        severity = "FATAL";
+        break;
+    case isc::log::NONE:
+        severity = "NONE";
+        break;
+    default:
+        isc_throw(ToElementError, "illegal severity: " << severity_);
+        break;
+    }
+    result->set("severity", Element::create(severity));
+    // Set debug level
+    result->set("debuglevel", Element::create(debuglevel_));
+
+    return (result);
+}
+
+} // end of namespace isc::dhcp
+} // end of namespace isc
diff --git a/src/lib/process/logging_info.h b/src/lib/process/logging_info.h
new file mode 100644
index 0000000..7660fe0
--- /dev/null
+++ b/src/lib/process/logging_info.h
@@ -0,0 +1,146 @@
+// Copyright (C) 2014-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef DHCPSRV_LOGGING_INFO_H
+#define DHCPSRV_LOGGING_INFO_H
+
+#include <log/logger_level.h>
+#include <log/logger_specification.h>
+#include <cc/cfg_to_element.h>
+#include <cc/user_context.h>
+#include <stdint.h>
+#include <vector>
+
+namespace isc {
+namespace process {
+
+/// @brief Defines single logging destination
+///
+/// This structure is used to keep log4cplus configuration parameters.
+struct LoggingDestination : public isc::data::CfgToElement {
+public:
+
+    /// @brief defines logging destination output
+    ///
+    /// Values accepted are: stdout, stderr, syslog, syslog:name.
+    /// Any other destination will be considered a file name.
+    std::string output_;
+
+    /// @brief Maximum number of log files in rotation
+    int maxver_;
+
+    /// @brief Maximum log file size
+    uint64_t maxsize_;
+
+    /// @brief Immediate flush
+    bool flush_;
+
+    /// @brief defines the log format pattern
+    /// It dictates what additional elements are output
+    std::string pattern_;
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other Object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool equals(const LoggingDestination& other) const;
+
+    /// @brief Default constructor.
+    LoggingDestination()
+        : output_("stdout"), maxver_(1), maxsize_(10240000), flush_(true), pattern_("") {
+    }
+
+    /// @brief Unparse a configuration object
+    ///
+    /// @return a pointer to unparsed configuration
+    virtual isc::data::ElementPtr toElement() const;
+};
+
+/// @brief structure that describes one logging entry
+///
+/// This is a structure that conveys one logger entry configuration.
+/// The structure in JSON form has the following syntax:
+///        {
+///            "name": "*",
+///            "output_options": [
+///                {
+///                    "output": "/path/to/the/logfile.log",
+///                    "maxver": 8,
+///                    "maxsize": 204800,
+///                    "flush": true
+///                    "pattern": "%-5p [%c] %m\n"
+///                }
+///            ],
+///            "severity": "WARN",
+///            "debuglevel": 99
+///        },
+class LoggingInfo : public isc::data::UserContext, public isc::data::CfgToElement {
+public:
+
+    /// @brief logging name
+    std::string name_;
+
+    /// @brief describes logging severity
+    isc::log::Severity severity_;
+
+    /// @brief debuglevel (used when severity_ == DEBUG)
+    ///
+    /// We use range 0(least verbose)..99(most verbose)
+    int debuglevel_;
+
+    /// @brief specific logging destinations
+    std::vector<LoggingDestination> destinations_;
+
+    /// @brief Default constructor.
+    LoggingInfo();
+
+    /// @brief Removes logging destinations.
+    void clearDestinations() {
+        destinations_.clear();
+    }
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool equals(const LoggingInfo& other) const;
+
+    /// @brief Compares two objects for equality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are equal, false otherwise.
+    bool operator==(const LoggingInfo& other) const {
+        return (equals(other));
+    }
+
+    /// @brief Compares two objects for inequality.
+    ///
+    /// @param other An object to be compared with this object.
+    ///
+    /// @return true if objects are not equal, false otherwise.
+    bool operator!=(const LoggingInfo& other) const {
+        return (!equals(other));
+    }
+
+    /// @brief Converts logger configuration to a spec.
+    isc::log::LoggerSpecification toSpec() const;
+
+    /// @brief Unparse a configuration object
+    ///
+    /// @return a pointer to unparsed configuration
+    virtual isc::data::ElementPtr toElement() const;
+};
+
+/// @brief storage for logging information in log4cplus format
+typedef std::vector<isc::process::LoggingInfo> LoggingInfoStorage;
+
+}
+}
+
+#endif // DHCPSRV_LOGGING_INFO_H
diff --git a/src/lib/process/process_messages.cc b/src/lib/process/process_messages.cc
new file mode 100644
index 0000000..a4ee304
--- /dev/null
+++ b/src/lib/process/process_messages.cc
@@ -0,0 +1,83 @@
+// File created from ../../../src/lib/process/process_messages.mes
+
+#include <cstddef>
+#include <log/message_types.h>
+#include <log/message_initializer.h>
+
+namespace isc {
+namespace process {
+
+extern const isc::log::MessageID DCTL_ALREADY_RUNNING = "DCTL_ALREADY_RUNNING";
+extern const isc::log::MessageID DCTL_CCSESSION_ENDING = "DCTL_CCSESSION_ENDING";
+extern const isc::log::MessageID DCTL_CFG_FILE_RELOAD_ERROR = "DCTL_CFG_FILE_RELOAD_ERROR";
+extern const isc::log::MessageID DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD = "DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD";
+extern const isc::log::MessageID DCTL_COMMAND_RECEIVED = "DCTL_COMMAND_RECEIVED";
+extern const isc::log::MessageID DCTL_CONFIG_CHECK_COMPLETE = "DCTL_CONFIG_CHECK_COMPLETE";
+extern const isc::log::MessageID DCTL_CONFIG_COMPLETE = "DCTL_CONFIG_COMPLETE";
+extern const isc::log::MessageID DCTL_CONFIG_DEPRECATED = "DCTL_CONFIG_DEPRECATED";
+extern const isc::log::MessageID DCTL_CONFIG_FETCH = "DCTL_CONFIG_FETCH";
+extern const isc::log::MessageID DCTL_CONFIG_FILE_LOAD_FAIL = "DCTL_CONFIG_FILE_LOAD_FAIL";
+extern const isc::log::MessageID DCTL_CONFIG_LOAD_FAIL = "DCTL_CONFIG_LOAD_FAIL";
+extern const isc::log::MessageID DCTL_CONFIG_START = "DCTL_CONFIG_START";
+extern const isc::log::MessageID DCTL_CONFIG_STUB = "DCTL_CONFIG_STUB";
+extern const isc::log::MessageID DCTL_CONFIG_UPDATE = "DCTL_CONFIG_UPDATE";
+extern const isc::log::MessageID DCTL_DEVELOPMENT_VERSION = "DCTL_DEVELOPMENT_VERSION";
+extern const isc::log::MessageID DCTL_INIT_PROCESS = "DCTL_INIT_PROCESS";
+extern const isc::log::MessageID DCTL_INIT_PROCESS_FAIL = "DCTL_INIT_PROCESS_FAIL";
+extern const isc::log::MessageID DCTL_NOT_RUNNING = "DCTL_NOT_RUNNING";
+extern const isc::log::MessageID DCTL_OPEN_CONFIG_DB = "DCTL_OPEN_CONFIG_DB";
+extern const isc::log::MessageID DCTL_PARSER_FAIL = "DCTL_PARSER_FAIL";
+extern const isc::log::MessageID DCTL_PID_FILE_ERROR = "DCTL_PID_FILE_ERROR";
+extern const isc::log::MessageID DCTL_PROCESS_FAILED = "DCTL_PROCESS_FAILED";
+extern const isc::log::MessageID DCTL_RUN_PROCESS = "DCTL_RUN_PROCESS";
+extern const isc::log::MessageID DCTL_SESSION_FAIL = "DCTL_SESSION_FAIL";
+extern const isc::log::MessageID DCTL_SHUTDOWN = "DCTL_SHUTDOWN";
+extern const isc::log::MessageID DCTL_SHUTDOWN_SIGNAL_RECVD = "DCTL_SHUTDOWN_SIGNAL_RECVD";
+extern const isc::log::MessageID DCTL_STANDALONE = "DCTL_STANDALONE";
+extern const isc::log::MessageID DCTL_STARTING = "DCTL_STARTING";
+extern const isc::log::MessageID DCTL_UNLOAD_LIBRARIES_ERROR = "DCTL_UNLOAD_LIBRARIES_ERROR";
+extern const isc::log::MessageID DCTL_UNSUPPORTED_SIGNAL = "DCTL_UNSUPPORTED_SIGNAL";
+
+} // namespace process
+} // namespace isc
+
+namespace {
+
+const char* values[] = {
+    "DCTL_ALREADY_RUNNING", "%1 already running? %2",
+    "DCTL_CCSESSION_ENDING", "%1 ending control channel session",
+    "DCTL_CFG_FILE_RELOAD_ERROR", "configuration reload failed: %1, reverting to current configuration.",
+    "DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD", "OS signal %1 received, reloading configuration from file: %2",
+    "DCTL_COMMAND_RECEIVED", "%1 received command: %2, arguments: %3",
+    "DCTL_CONFIG_CHECK_COMPLETE", "server has completed configuration check: %1, result: %2",
+    "DCTL_CONFIG_COMPLETE", "server has completed configuration: %1",
+    "DCTL_CONFIG_DEPRECATED", "server configuration includes a deprecated object: %1",
+    "DCTL_CONFIG_FETCH", "Fetching configuration data from config backends.",
+    "DCTL_CONFIG_FILE_LOAD_FAIL", "%1 reason: %2",
+    "DCTL_CONFIG_LOAD_FAIL", "%1 configuration failed to load: %2",
+    "DCTL_CONFIG_START", "parsing new configuration: %1",
+    "DCTL_CONFIG_STUB", "%1 configuration stub handler called",
+    "DCTL_CONFIG_UPDATE", "%1 updated configuration received: %2",
+    "DCTL_DEVELOPMENT_VERSION", "This software is a development branch of Kea. It is not recommended for production use.",
+    "DCTL_INIT_PROCESS", "%1 initializing the application",
+    "DCTL_INIT_PROCESS_FAIL", "%1 application initialization failed: %2",
+    "DCTL_NOT_RUNNING", "%1 application instance is not running",
+    "DCTL_OPEN_CONFIG_DB", "Opening configuration database: %1",
+    "DCTL_PARSER_FAIL", ": %1",
+    "DCTL_PID_FILE_ERROR", "%1 could not create a PID file: %2",
+    "DCTL_PROCESS_FAILED", "%1 application execution failed: %2",
+    "DCTL_RUN_PROCESS", "%1 starting application event loop",
+    "DCTL_SESSION_FAIL", "%1 controller failed to establish Kea session: %1",
+    "DCTL_SHUTDOWN", "%1 has shut down, pid: %2, version: %3",
+    "DCTL_SHUTDOWN_SIGNAL_RECVD", "OS signal %1 received, starting shutdown",
+    "DCTL_STANDALONE", "%1 skipping message queue, running standalone",
+    "DCTL_STARTING", "%1 starting, pid: %2, version: %3 (%4)",
+    "DCTL_UNLOAD_LIBRARIES_ERROR", "error unloading hooks libraries during shutdown: %1",
+    "DCTL_UNSUPPORTED_SIGNAL", "ignoring reception of unsupported signal: %1",
+    NULL
+};
+
+const isc::log::MessageInitializer initializer(values);
+
+} // Anonymous namespace
+
diff --git a/src/lib/process/process_messages.h b/src/lib/process/process_messages.h
new file mode 100644
index 0000000..0ae950a
--- /dev/null
+++ b/src/lib/process/process_messages.h
@@ -0,0 +1,45 @@
+// File created from ../../../src/lib/process/process_messages.mes
+
+#ifndef PROCESS_MESSAGES_H
+#define PROCESS_MESSAGES_H
+
+#include <log/message_types.h>
+
+namespace isc {
+namespace process {
+
+extern const isc::log::MessageID DCTL_ALREADY_RUNNING;
+extern const isc::log::MessageID DCTL_CCSESSION_ENDING;
+extern const isc::log::MessageID DCTL_CFG_FILE_RELOAD_ERROR;
+extern const isc::log::MessageID DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD;
+extern const isc::log::MessageID DCTL_COMMAND_RECEIVED;
+extern const isc::log::MessageID DCTL_CONFIG_CHECK_COMPLETE;
+extern const isc::log::MessageID DCTL_CONFIG_COMPLETE;
+extern const isc::log::MessageID DCTL_CONFIG_DEPRECATED;
+extern const isc::log::MessageID DCTL_CONFIG_FETCH;
+extern const isc::log::MessageID DCTL_CONFIG_FILE_LOAD_FAIL;
+extern const isc::log::MessageID DCTL_CONFIG_LOAD_FAIL;
+extern const isc::log::MessageID DCTL_CONFIG_START;
+extern const isc::log::MessageID DCTL_CONFIG_STUB;
+extern const isc::log::MessageID DCTL_CONFIG_UPDATE;
+extern const isc::log::MessageID DCTL_DEVELOPMENT_VERSION;
+extern const isc::log::MessageID DCTL_INIT_PROCESS;
+extern const isc::log::MessageID DCTL_INIT_PROCESS_FAIL;
+extern const isc::log::MessageID DCTL_NOT_RUNNING;
+extern const isc::log::MessageID DCTL_OPEN_CONFIG_DB;
+extern const isc::log::MessageID DCTL_PARSER_FAIL;
+extern const isc::log::MessageID DCTL_PID_FILE_ERROR;
+extern const isc::log::MessageID DCTL_PROCESS_FAILED;
+extern const isc::log::MessageID DCTL_RUN_PROCESS;
+extern const isc::log::MessageID DCTL_SESSION_FAIL;
+extern const isc::log::MessageID DCTL_SHUTDOWN;
+extern const isc::log::MessageID DCTL_SHUTDOWN_SIGNAL_RECVD;
+extern const isc::log::MessageID DCTL_STANDALONE;
+extern const isc::log::MessageID DCTL_STARTING;
+extern const isc::log::MessageID DCTL_UNLOAD_LIBRARIES_ERROR;
+extern const isc::log::MessageID DCTL_UNSUPPORTED_SIGNAL;
+
+} // namespace process
+} // namespace isc
+
+#endif // PROCESS_MESSAGES_H
diff --git a/src/lib/process/process_messages.mes b/src/lib/process/process_messages.mes
new file mode 100644
index 0000000..1d601ab
--- /dev/null
+++ b/src/lib/process/process_messages.mes
@@ -0,0 +1,156 @@
+# Copyright (C) 2016-2021 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+$NAMESPACE isc::process
+
+% DCTL_ALREADY_RUNNING %1 already running? %2
+This is an error message that occurs when a module encounters a pre-existing
+PID file which contains the PID of a running process.  This most likely
+indicates an attempt to start a second instance of a module using the
+same configuration file.  It is possible, though unlikely, that the PID file
+is a remnant left behind by a server crash or power failure and the PID
+it contains refers to a process other than Kea process.  In such an event,
+it would be necessary to manually remove the PID file.  The first argument is
+the process name, the second contains the PID and PID file.
+
+% DCTL_CCSESSION_ENDING %1 ending control channel session
+This debug message is issued just before the controller attempts
+to disconnect from its session with the Kea control channel.
+
+% DCTL_CFG_FILE_RELOAD_ERROR configuration reload failed: %1, reverting to current configuration.
+This is an error message indicating that the application attempted to reload
+its configuration from file and encountered an error.  This is likely due to
+invalid content in the configuration file.  The application should continue
+to operate under its current configuration.
+
+% DCTL_CFG_FILE_RELOAD_SIGNAL_RECVD OS signal %1 received, reloading configuration from file: %2
+This is an informational message indicating the application has received a signal
+instructing it to reload its configuration from file.
+
+% DCTL_COMMAND_RECEIVED %1 received command: %2, arguments: %3
+A debug message listing the command (and possible arguments) received
+from the Kea control system by the controller.
+
+% DCTL_CONFIG_CHECK_COMPLETE server has completed configuration check: %1, result: %2
+This is an informational message announcing the successful processing of a
+new configuration check is complete. The result of that check is printed.
+This informational message is printed when configuration check is requested.
+
+% DCTL_CONFIG_COMPLETE server has completed configuration: %1
+This is an informational message announcing the successful processing of a
+new configuration. It is output during server startup, and when an updated
+configuration is committed by the administrator.  Additional information
+may be provided.
+
+% DCTL_CONFIG_DEPRECATED server configuration includes a deprecated object: %1
+This error message is issued when the configuration includes a deprecated
+object (i.e. a top level element) which will be ignored.
+
+% DCTL_CONFIG_FETCH Fetching configuration data from config backends.
+This is an informational message emitted when the Kea server is about to begin
+retrieving configuration data from one or more configuration backends.
+
+% DCTL_CONFIG_FILE_LOAD_FAIL %1 reason: %2
+This fatal error message indicates that the application attempted to load its
+initial configuration from file and has failed. The service will exit.
+
+% DCTL_CONFIG_LOAD_FAIL %1 configuration failed to load: %2
+This critical error message indicates that the initial application
+configuration has failed. The service will start, but will not
+process requests until the configuration has been corrected.
+
+% DCTL_CONFIG_START parsing new configuration: %1
+A debug message indicating that the application process has received an
+updated configuration and has passed it to its configuration manager
+for parsing.
+
+% DCTL_CONFIG_STUB %1 configuration stub handler called
+This debug message is issued when the dummy handler for configuration
+events is called.  This only happens during initial startup.
+
+% DCTL_CONFIG_UPDATE %1 updated configuration received: %2
+A debug message indicating that the controller has received an
+updated configuration from the Kea configuration system.
+
+% DCTL_DEVELOPMENT_VERSION This software is a development branch of Kea. It is not recommended for production use.
+This warning message is displayed when the version is a development
+(vs stable) one: the second number of the version is odd.
+
+% DCTL_INIT_PROCESS %1 initializing the application
+This debug message is issued just before the controller attempts
+to create and initialize its application instance.
+
+% DCTL_INIT_PROCESS_FAIL %1 application initialization failed: %2
+This error message is issued if the controller could not initialize the
+application and will exit.
+
+% DCTL_NOT_RUNNING %1 application instance is not running
+A warning message is issued when an attempt is made to shut down the
+application when it is not running.
+
+% DCTL_OPEN_CONFIG_DB Opening configuration database: %1
+This message is printed when the Kea server is attempting to open a
+configuration database.  The database access string with password redacted
+is logged.
+
+% DCTL_PARSER_FAIL : %1
+On receipt of a new configuration, the server failed to create a parser to
+decode the contents of the named configuration element, or the creation
+succeeded but the parsing actions and committal of changes failed.
+The reason for the failure is given in the message.
+
+% DCTL_PID_FILE_ERROR %1 could not create a PID file: %2
+This is an error message that occurs when the server is unable to create
+its PID file.  The log message should contain details sufficient to
+determine the underlying cause.  The most likely culprits are that
+some portion of the pathname does not exist or a permissions issue. The
+default path is determined by --localstatedir or --runstatedir configure
+parameters but may be overridden by setting environment variable,
+KEA_PIDFILE_DIR.  The first argument is the process name.
+
+% DCTL_PROCESS_FAILED %1 application execution failed: %2
+The controller has encountered a fatal error while running the
+application and is terminating. The reason for the failure is
+included in the message.
+
+% DCTL_RUN_PROCESS %1 starting application event loop
+This debug message is issued just before the controller invokes
+the application run method.
+
+% DCTL_SESSION_FAIL %1 controller failed to establish Kea session: %1
+The controller has failed to establish communication with the rest of
+Kea and will exit.
+
+% DCTL_SHUTDOWN %1 has shut down, pid: %2, version: %3
+This is an informational message indicating that the service has shut
+down. The argument specifies a name of the service.
+
+% DCTL_SHUTDOWN_SIGNAL_RECVD OS signal %1 received, starting shutdown
+This is a debug message indicating the application has received a signal
+instructing it to shutdown.
+
+% DCTL_STANDALONE %1 skipping message queue, running standalone
+This is a debug message indicating that the controller is running in the
+application in standalone mode. This means it will not connected to the Kea
+message queue. Standalone mode is only useful during program development,
+and should not be used in a production environment.
+
+% DCTL_STARTING %1 starting, pid: %2, version: %3 (%4)
+This is an informational message issued when controller for the
+service first starts. Version is also reported.
+
+% DCTL_UNLOAD_LIBRARIES_ERROR error unloading hooks libraries during shutdown: %1
+This error message indicates that during shutdown, unloading hooks
+libraries failed to close them. If the list of libraries is empty it is
+a programmatic error in the server code. If it is not empty it could be
+a programmatic error in one of the hooks libraries which could lead to
+a crash during finalization.
+
+% DCTL_UNSUPPORTED_SIGNAL ignoring reception of unsupported signal: %1
+This is a debug message indicating that the application received an
+unsupported signal.  This is a programming error indicating that the
+application has registered to receive the signal but no associated
+processing logic has been added.
diff --git a/src/lib/process/redact_config.cc b/src/lib/process/redact_config.cc
new file mode 100644
index 0000000..16bba0f
--- /dev/null
+++ b/src/lib/process/redact_config.cc
@@ -0,0 +1,97 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <process/redact_config.h>
+
+#include <boost/algorithm/string.hpp>
+
+using namespace isc;
+using namespace isc::data;
+using namespace std;
+
+namespace {
+
+template <typename ElementPtrType>
+ElementPtrType
+redact(ElementPtrType const& element, list<string> json_path) {
+    if (!element) {
+        isc_throw(BadValue, "redact() got a null pointer");
+    }
+
+    string const next_key(json_path.empty() ? string() : json_path.front());
+    ElementPtr result;
+    if (element->getType() == Element::list) {
+        // If we are looking for a list...
+        if (next_key == "*" || next_key == "[]") {
+            // But if we are looking specifically for a list...
+            if (next_key == "[]") {
+                // Then advance in the path.
+                json_path.pop_front();
+            }
+            // Then redact all children.
+            result = Element::createList();
+            for (ElementPtr const& child : element->listValue()) {
+                result->add(redact(child, json_path));
+            }
+            return result;
+        }
+    } else if (element->getType() == Element::map) {
+        // If we are looking for anything or if we have reached the end of a
+        /// path...
+        if (next_key == "*" || json_path.empty()) {
+            // Then iterate through all the children.
+            result = Element::createMap();
+            for (auto kv : element->mapValue()) {
+                std::string const& key(kv.first);
+                ConstElementPtr const& value(kv.second);
+
+                if (boost::algorithm::ends_with(key, "password") ||
+                    boost::algorithm::ends_with(key, "secret")) {
+                    // Sensitive data
+                    result->set(key, Element::create(string("*****")));
+                } else if (key == "user-context") {
+                    // Skip user contexts.
+                    result->set(key, value);
+                } else {
+                    if (json_path.empty()) {
+                        // End of path means no sensitive data expected in this
+                        // subtree, so we stop here.
+                        result->set(key, value);
+                    } else {
+                        // We are looking for anything '*' so redact further.
+                        result->set(key, redact(value, json_path));
+                    }
+                }
+            }
+            return result;
+        } else {
+            ConstElementPtr child(element->get(next_key));
+            if (child) {
+                result = isc::data::copy(element, 1);
+                json_path.pop_front();
+                result->set(next_key, redact(child, json_path));
+                return result;
+            }
+        }
+    }
+
+    return element;
+}
+
+}  // namespace
+
+namespace isc {
+namespace process {
+
+ConstElementPtr
+redactConfig(ConstElementPtr const& element, list<string> const& json_path) {
+    return redact(element, json_path);
+}
+
+}  // namespace process
+}  // namespace isc
diff --git a/src/lib/process/redact_config.h b/src/lib/process/redact_config.h
new file mode 100644
index 0000000..a0d1d0a
--- /dev/null
+++ b/src/lib/process/redact_config.h
@@ -0,0 +1,37 @@
+// Copyright (C) 2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef REDACT_CONFIG_H
+#define REDACT_CONFIG_H
+
+#include <cc/data.h>
+#include <list>
+
+namespace isc {
+namespace process {
+
+/// @brief Redact a configuration.
+///
+/// This method walks on the configuration tree:
+///  - it copies only subtrees where a change was done.
+///  - it replaces passwords and secrets by asterisks.
+///  - it skips user context.
+///  - if a not empty list of keywords is given it follows only them.
+///
+/// @param element initially the Element tree structure that describe the
+/// configuration and smaller subtrees in recursive calls.
+/// @param json_path JSON path to redact
+///
+/// @return a copy of the config where passwords and secrets were replaced by
+/// asterisks so it can be safely logged to an unprivileged place.
+isc::data::ConstElementPtr
+redactConfig(isc::data::ConstElementPtr const& element,
+             std::list<std::string> const& json_path = {"*"});
+
+} // namespace process
+} // namespace isc
+
+#endif // REDACT_CONFIG_H
diff --git a/src/lib/process/tests/Makefile.am b/src/lib/process/tests/Makefile.am
new file mode 100644
index 0000000..f556c76
--- /dev/null
+++ b/src/lib/process/tests/Makefile.am
@@ -0,0 +1,56 @@
+SUBDIRS = .
+dhcp_data_dir = @runstatedir@/@PACKAGE@
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+AM_CPPFLAGS += -DTEST_DATA_BUILDDIR=\"$(abs_top_builddir)/src/lib/process/tests\"
+AM_CPPFLAGS += -DDATA_DIR="\"$(dhcp_data_dir)\""
+AM_CPPFLAGS += -DINSTALL_PROG=\"$(abs_top_srcdir)/install-sh\"
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+CLEANFILES = *.gcno *.gcda
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+TESTS =
+if HAVE_GTEST
+TESTS += libprocess_unittests
+
+libprocess_unittests_SOURCES  = d_cfg_mgr_unittests.cc
+libprocess_unittests_SOURCES += cb_ctl_base_unittests.cc
+libprocess_unittests_SOURCES += config_base_unittests.cc
+libprocess_unittests_SOURCES += config_ctl_info_unittests.cc
+libprocess_unittests_SOURCES += config_ctl_parser_unittests.cc
+libprocess_unittests_SOURCES += d_controller_unittests.cc
+libprocess_unittests_SOURCES += daemon_unittest.cc
+libprocess_unittests_SOURCES += log_parser_unittests.cc
+libprocess_unittests_SOURCES += logging_info_unittests.cc
+libprocess_unittests_SOURCES += run_unittests.cc
+
+libprocess_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+
+libprocess_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+
+libprocess_unittests_LDFLAGS  = $(AM_LDFLAGS) $(GTEST_LDFLAGS)
+
+libprocess_unittests_LDADD  = $(top_builddir)/src/lib/process/testutils/libprocesstest.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/process/libkea-process.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/config/libkea-cfgclient.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/http/libkea-http.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/dhcp/libkea-dhcp++.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/hooks/libkea-hooks.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/testutils/libkea-testutils.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+libprocess_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libprocess_unittests_LDADD += $(LOG4CPLUS_LIBS) $(CRYPTO_LIBS)
+libprocess_unittests_LDADD += $(BOOST_LIBS) $(GTEST_LDADD)
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/process/tests/Makefile.in b/src/lib/process/tests/Makefile.in
new file mode 100644
index 0000000..29101f1
--- /dev/null
+++ b/src/lib/process/tests/Makefile.in
@@ -0,0 +1,1184 @@
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diff --git a/src/lib/process/tests/cb_ctl_base_unittests.cc b/src/lib/process/tests/cb_ctl_base_unittests.cc
new file mode 100644
index 0000000..58d0aa0
--- /dev/null
+++ b/src/lib/process/tests/cb_ctl_base_unittests.cc
@@ -0,0 +1,718 @@
+// Copyright (C) 2019-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <config_backend/base_config_backend_mgr.h>
+#include <config_backend/base_config_backend_pool.h>
+#include <process/cb_ctl_base.h>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+#include <map>
+#include <string>
+
+using namespace isc;
+using namespace isc::cb;
+using namespace isc::db;
+using namespace isc::process;
+
+namespace {
+
+/// @brief Implementation of the config backend for testing the
+/// @c CBControlBase template class.
+///
+/// This simple class allows for adding, retrieving and clearing audit
+/// entries. The @c CBControlBase unit tests use it to control the
+/// behavior of the @c CBControlBase class under test.
+class CBControlBackend : BaseConfigBackend {
+public:
+
+    /// @brief Constructor.
+    CBControlBackend(const db::DatabaseConnection::ParameterMap&) {
+    }
+
+    /// @brief Retrieves the audit entries later than specified time.
+    ///
+    /// @param modification_time The lower bound time for which audit
+    /// entries should be returned.
+    /// @param modification_id The lower bound id for which audit
+    /// entries should be returned.
+    ///
+    /// @return Collection of audit entries later than specified time.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const db::ServerSelector&,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t modification_id) const {
+        db::AuditEntryCollection filtered_entries;
+
+        // Use the index which orders the audit entries by timestamps.
+        const auto& index = audit_entries_.get<AuditEntryModificationTimeIdTag>();
+
+        // Locate the first audit entry after the last one having the
+        // specified modification time and id.
+        auto modification = boost::make_tuple(modification_time, modification_id);
+        auto first_entry = index.upper_bound(modification);
+
+        // If there are any entries found return them.
+        if (first_entry != index.end()) {
+            filtered_entries.insert(first_entry, index.end());
+        }
+
+        return (filtered_entries);
+    }
+
+    /// @brief Add audit entry to the backend.
+    ///
+    /// @param object_type Object type to be stored in the audit entry.
+    /// @param object_id Object id to be stored in the audit entry.
+    /// @param modification_time Audit entry modification time to be set.
+    /// @param modification_id Audit entry modification id to be set.
+    void addAuditEntry(const ServerSelector&,
+                       const std::string& object_type,
+                       const uint64_t object_id,
+                       const boost::posix_time::ptime& modification_time,
+                       const uint64_t modification_id) {
+        // Create new audit entry from the specified parameters.
+        AuditEntryPtr audit_entry(new AuditEntry(object_type,
+                                                 object_id,
+                                                 AuditEntry::ModificationType::CREATE,
+                                                 modification_time,
+                                                 modification_id,
+                                                 "added audit entry"));
+
+        // The audit entries are held in the static variable so as they
+        // don't disappear when we diconnect from the backend. The
+        // audit entries are explicitly cleared during the unit tests
+        // setup.
+        audit_entries_.insert(audit_entry);
+    }
+
+    /// @brief Returns backend type in the textual format.
+    ///
+    /// @return Name of the storage for configurations, e.g. "mysql",
+    /// "pgsql" and so forth.
+    virtual std::string getType() const {
+        return ("memfile");
+    }
+
+    /// @brief Returns backend host
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return host on which the database is located.
+    virtual std::string getHost() const {
+        return ("");
+    }
+
+    /// @brief Returns backend port number.
+    ///
+    /// This is used by the @c BaseConfigBackendPool to select backend
+    /// when @c BackendSelector is specified.
+    ///
+    /// @return Port number on which database service is available.
+    virtual uint16_t getPort() const {
+        return (0);
+    }
+
+    /// @brief Removes audit entries.
+    static void clearAuditEntries() {
+        audit_entries_.clear();
+    }
+
+private:
+
+    /// @brief Static collection of audit entries.
+    ///
+    /// Thanks to storing them in the static member they are preserved
+    /// when the unit tests "disconnect" from the backend.
+    static AuditEntryCollection audit_entries_;
+};
+
+/// @brief Pointer to the @c CBControlBackend object.
+typedef boost::shared_ptr<CBControlBackend> CBControlBackendPtr;
+
+AuditEntryCollection CBControlBackend::audit_entries_;
+
+/// @brief Implementation of the backends pool used in the
+/// @c CBControlBase template class unit tests.
+class CBControlBackendPool : public BaseConfigBackendPool<CBControlBackend> {
+public:
+
+    /// @brief Add audit entry to the backend.
+    ///
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param object_type Object type to be stored in the audit entry.
+    /// @param object_id Object id to be stored in the audit entry.
+    /// @param modification_time Audit entry modification time to be set.
+    /// @param modification_id Audit entry modification id to be set.
+    void addAuditEntry(const BackendSelector& backend_selector,
+                       const ServerSelector& server_selector,
+                       const std::string& object_type,
+                       const uint64_t object_id,
+                       const boost::posix_time::ptime& modification_time,
+                       const uint64_t modification_id) {
+        createUpdateDeleteProperty<void, const std::string&, uint64_t,
+                                   const boost::posix_time::ptime&, uint64_t>
+            (&CBControlBackend::addAuditEntry, backend_selector, server_selector,
+             object_type, object_id, modification_time, modification_id);
+    }
+
+    /// @brief Retrieves the audit entries later than specified time.
+    ///
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param modification_time The lower bound time for which audit
+    /// entries should be returned.
+    /// @param modification_id The lower bound id for which audit
+    /// entries should be returned.
+    ///
+    /// @return Collection of audit entries later than specified time.
+    virtual db::AuditEntryCollection
+    getRecentAuditEntries(const BackendSelector& backend_selector,
+                          const ServerSelector& server_selector,
+                          const boost::posix_time::ptime& modification_time,
+                          const uint64_t modification_id) const {
+        AuditEntryCollection audit_entries;
+        getMultiplePropertiesConst<AuditEntryCollection, const boost::posix_time::ptime&>
+            (&CBControlBackend::getRecentAuditEntries, backend_selector,
+             server_selector, audit_entries, modification_time,
+             modification_id);
+        return (audit_entries);
+    }
+};
+
+/// @brief Implementation of the config backends manager used
+/// in the @c CBControlBase template class unit tests.
+class CBControlBackendMgr : public BaseConfigBackendMgr<CBControlBackendPool> {
+public:
+
+    /// @brief Constructor.
+    CBControlBackendMgr()
+        : instance_id_(0) {
+    }
+
+    /// @brief Returns instance of the @c CBControlBackendMgr.
+    ///
+    /// @return Reference to the instance of the @c CBControlBackendMgr.
+    static CBControlBackendMgr& instance() {
+        static CBControlBackendMgr mgr;
+        return (mgr);
+    }
+
+    /// @brief Returns instance id.
+    ///
+    /// This value is used in tests which verify that the @c CBControlBase::getMgr
+    /// returns the right instance of the CB manager.
+    ///
+    /// @return Instance id.
+    uint32_t getInstanceId() const {
+        return (instance_id_);
+    }
+
+    /// @brief Sets new instance id.
+    ///
+    /// @param instance_id New instance id.
+    void setInstanceId(const uint32_t instance_id) {
+        instance_id_ = instance_id;
+    }
+
+    /// @brief Instance id.
+    uint32_t instance_id_;
+};
+
+/// @brief Implementation of the @c CBControlBase class used in
+/// the unit tests.
+///
+/// It makes some of the protected methods public. It also provides
+/// means to test the behavior of the @c CBControlBase template.
+class CBControl : public CBControlBase<CBControlBackendMgr> {
+public:
+
+    using CBControlBase<CBControlBackendMgr>::fetchConfigElement;
+    using CBControlBase<CBControlBackendMgr>::getMgr;
+    using CBControlBase<CBControlBackendMgr>::getInitialAuditRevisionTime;
+
+    /// @brief Constructor.
+    CBControl()
+        : CBControlBase<CBControlBackendMgr>(),
+        merges_num_(0),
+        backend_selector_(BackendSelector::Type::MYSQL),
+        server_selector_(ServerSelector::UNASSIGNED()),
+        audit_entries_num_(-1),
+        enable_throw_(false) {
+    }
+
+    /// @brief Implementation of the method called to fetch and apply
+    /// configuration from the database into the local configuration.
+    ///
+    /// This stub implementation doesn't attempt to merge any configurations
+    /// but merely records the values of the parameters called.
+    ///
+    /// @param backend_selector Backend selector.
+    /// @param server_selector Server selector.
+    /// @param audit_entries Collection of audit entries.
+    virtual void databaseConfigApply(const BackendSelector& backend_selector,
+                                     const ServerSelector& server_selector,
+                                     const boost::posix_time::ptime&,
+                                     const AuditEntryCollection& audit_entries) {
+        ++merges_num_;
+        backend_selector_ = backend_selector;
+        server_selector_ = server_selector;
+        audit_entries_num_ = static_cast<int>(audit_entries.size());
+
+        if (enable_throw_) {
+            isc_throw(Unexpected, "throwing from databaseConfigApply");
+        }
+    }
+
+    /// @brief Returns the number of times the @c databaseConfigApply was called.
+    size_t getMergesNum() const {
+        return (merges_num_);
+    }
+
+    /// @brief Returns backend selector used as an argument in a call to
+    /// @c databaseConfigApply.
+    const BackendSelector& getBackendSelector() const {
+        return (backend_selector_);
+    }
+
+    /// @brief Returns server selector used as an argument in a call to
+    /// @c databaseConfigApply.
+    const ServerSelector& getServerSelector() const {
+        return (server_selector_);
+    }
+
+    /// @brief Returns the number of audit entries in the collection passed
+    /// to @c databaseConfigApply
+    int getAuditEntriesNum() const {
+        return (audit_entries_num_);
+    }
+
+    /// @brief Returns the recorded time of last audit entry.
+    boost::posix_time::ptime getLastAuditRevisionTime() const {
+        return (last_audit_revision_time_);
+    }
+
+    /// @brief Returns the recorded id of last audit entry.
+    uint64_t getLastAuditRevisionId() const {
+        return (last_audit_revision_id_);
+    }
+
+    /// @brief Overwrites the last audit entry time.
+    ///
+    /// @param last_audit_revision_time New time to be set.
+    void setLastAuditRevisionTime(const boost::posix_time::ptime& last_audit_revision_time) {
+        last_audit_revision_time_ = last_audit_revision_time;
+    }
+
+    /// @brief Overwrites the last audit revision id.
+    ///
+    /// @param last_audit_revision_id New id to be set.
+    void setLastAuditRevisionId(const uint64_t& last_audit_revision_id) {
+        last_audit_revision_id_ = last_audit_revision_id;
+    }
+
+    /// @brief Enables the @c databaseConfigApply function to throw.
+    ///
+    /// This is useful to test scenarios when configuration merge fails.
+    void enableThrow() {
+        enable_throw_ = true;
+    }
+
+private:
+
+    /// @brief Recorded number of calls to @c databaseConfigApply.
+    size_t merges_num_;
+
+    /// @brief Recorded backend selector value.
+    BackendSelector backend_selector_;
+
+    /// @brief Recorded server selector value.
+    ServerSelector server_selector_;
+
+    /// @brief Recorded number of audit entries.
+    int audit_entries_num_;
+
+    /// @brief Boolean value indicating if the @c databaseConfigApply should throw.
+    bool enable_throw_;
+};
+
+/// @brief Out of the blue instance id used in tests.
+constexpr uint32_t TEST_INSTANCE_ID = 123;
+
+/// @brief Test fixture class for @c CBControlBase template class.
+class CBControlBaseTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor.
+    CBControlBaseTest()
+        : cb_ctl_(), mgr_(CBControlBackendMgr::instance()),
+          timestamps_() {
+        mgr_.registerBackendFactory("db1",
+            [](const DatabaseConnection::ParameterMap& params)
+                -> CBControlBackendPtr {
+            return (CBControlBackendPtr(new CBControlBackend(params)));
+        });
+        mgr_.setInstanceId(TEST_INSTANCE_ID);
+        initTimestamps();
+        CBControlBackend::clearAuditEntries();
+    }
+
+    /// @brief Destructor.
+    ///
+    /// Removes audit entries created in the test.
+    ~CBControlBaseTest() {
+        CBControlBackend::clearAuditEntries();
+    }
+
+    /// @brief Initialize posix time values used in tests.
+    void initTimestamps() {
+        // Current time minus 1 hour to make sure it is in the past.
+        timestamps_["today"] = boost::posix_time::second_clock::local_time()
+            - boost::posix_time::hours(1);
+        // Yesterday.
+        timestamps_["yesterday"] = timestamps_["today"] - boost::posix_time::hours(24);
+        // Two days ago.
+        timestamps_["two days ago"] = timestamps_["today"] - boost::posix_time::hours(48);
+        // Tomorrow.
+        timestamps_["tomorrow"] = timestamps_["today"] + boost::posix_time::hours(24);
+    }
+
+    /// @brief Creates an instance of the configuration object.
+    ///
+    /// @param db1_access Database access string to be used to connect to
+    /// the test configuration backend. It doesn't connect if the string
+    /// is empty.
+    ConfigPtr makeConfigBase(const std::string& db1_access = "") const {
+        ConfigControlInfoPtr config_ctl_info(new ConfigControlInfo());
+
+        if (!db1_access.empty()) {
+            config_ctl_info->addConfigDatabase(db1_access);
+        }
+
+        ConfigPtr config_base(new ConfigBase());
+
+        config_base->setConfigControlInfo(config_ctl_info);
+        return (config_base);
+    }
+
+    /// @brief Instance of the @c CBControl used in tests.
+    CBControl cb_ctl_;
+
+    /// @brief Instance of the Config Backend Manager.
+    CBControlBackendMgr& mgr_;
+
+    /// @brief Holds timestamp values used in tests.
+    std::map<std::string, boost::posix_time::ptime> timestamps_;
+};
+
+// This test verifies that the same instance of the Config
+// Backend Manager is returned all the time.
+TEST_F(CBControlBaseTest, getMgr) {
+    auto mgr = cb_ctl_.getMgr();
+    EXPECT_EQ(TEST_INSTANCE_ID, mgr.getInstanceId());
+}
+
+// This test verifies that the initial audit revision time is set to
+// local time of 2000-01-01.
+TEST_F(CBControlBaseTest, getInitialAuditRevisionTime) {
+    auto initial_time = cb_ctl_.getInitialAuditRevisionTime();
+    ASSERT_FALSE(initial_time.is_not_a_date_time());
+    auto tm = boost::posix_time::to_tm(initial_time);
+    EXPECT_EQ(100, tm.tm_year);
+    EXPECT_EQ(0, tm.tm_mon);
+    EXPECT_EQ(0, tm.tm_yday);
+    EXPECT_EQ(0, tm.tm_hour);
+    EXPECT_EQ(0, tm.tm_min);
+    EXPECT_EQ(0, tm.tm_sec);
+}
+
+// This test verifies that last audit entry time is reset upon the
+// call to CBControlBase::reset().
+TEST_F(CBControlBaseTest, reset) {
+    cb_ctl_.setLastAuditRevisionTime(timestamps_["tomorrow"]);
+    cb_ctl_.reset();
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+}
+
+// This test verifies that it is correctly determined what entries the
+// server should fetch for the particular configuration element.
+TEST_F(CBControlBaseTest, fetchConfigElement) {
+    db::AuditEntryCollection audit_entries;
+    db::AuditEntryCollection updated;
+    // When audit entries collection is empty any subset is empty too.
+    updated = cb_ctl_.fetchConfigElement(audit_entries, "my_object_type");
+    EXPECT_TRUE(updated.empty());
+
+    // Now test the case that there is a DELETE audit entry. In this case
+    // our function should indicate that the configuration should not be
+    // fetched for the given object type. Note that when the configuration
+    // element is deleted, it no longer exists in database so there is
+    // no reason to fetch the data from the database.
+    AuditEntryPtr audit_entry(new AuditEntry("dhcp4_subnet", 1234 ,
+                                             AuditEntry::ModificationType::DELETE,
+                                             2345, "added audit entry"));
+    audit_entries.insert(audit_entry);
+    updated = cb_ctl_.fetchConfigElement(audit_entries, "my_object_type");
+    EXPECT_TRUE(updated.empty());
+    EXPECT_TRUE(hasObjectId(audit_entries, 1234));
+    EXPECT_FALSE(hasObjectId(audit_entries, 5678));
+    EXPECT_FALSE(hasObjectId(updated, 1234));
+
+    // Add another audit entry which indicates creation of the configuration element.
+    // This time we should get it.
+    audit_entry.reset(new AuditEntry("my_object_type", 5678,
+                                     AuditEntry::ModificationType::CREATE,
+                                     6789, "added audit entry"));
+    audit_entries.insert(audit_entry);
+    updated = cb_ctl_.fetchConfigElement(audit_entries, "my_object_type");
+    ASSERT_EQ(1, updated.size());
+    AuditEntryPtr updated_entry = (*updated.begin());
+    ASSERT_TRUE(updated_entry);
+    EXPECT_EQ("my_object_type", updated_entry->getObjectType());
+    EXPECT_EQ(5678, updated_entry->getObjectId());
+    EXPECT_EQ(AuditEntry::ModificationType::CREATE, updated_entry->getModificationType());
+    EXPECT_TRUE(hasObjectId(audit_entries, 5678));
+    EXPECT_TRUE(hasObjectId(updated, 5678));
+    EXPECT_FALSE(hasObjectId(updated, 1234));
+
+    // Also we should get 'true' for the UPDATE case.
+    audit_entry.reset(new AuditEntry("my_object_type",
+                                     5678, AuditEntry::ModificationType::UPDATE,
+                                     6790, "added audit entry"));
+    audit_entries.insert(audit_entry);
+    updated = cb_ctl_.fetchConfigElement(audit_entries, "my_object_type");
+    EXPECT_EQ(2, updated.size());
+    bool saw_create = false;
+    bool saw_update =  false;
+    for (auto entry : updated) {
+        EXPECT_EQ("my_object_type", entry->getObjectType());
+        EXPECT_EQ(5678, entry->getObjectId());
+        if (AuditEntry::ModificationType::CREATE == entry->getModificationType()) {
+            EXPECT_FALSE(saw_create);
+            saw_create = true;
+        } else if (AuditEntry::ModificationType::UPDATE == entry->getModificationType()) {
+            EXPECT_FALSE(saw_update);
+            saw_update = true;
+        }
+    }
+    EXPECT_TRUE(saw_create);
+    EXPECT_TRUE(saw_update);
+    EXPECT_TRUE(hasObjectId(updated, 5678));
+    EXPECT_FALSE(hasObjectId(updated, 1234));
+}
+
+// This test verifies that true is return when the server successfully
+// connects to the backend and false if there are no backends to connect
+// to.
+TEST_F(CBControlBaseTest, connect) {
+    EXPECT_TRUE(cb_ctl_.databaseConfigConnect(makeConfigBase("type=db1")));
+    EXPECT_FALSE(cb_ctl_.databaseConfigConnect(makeConfigBase()));
+}
+
+// This test verifies the scenario when the server fetches the entire
+// configuration from the database upon startup.
+TEST_F(CBControlBaseTest, fetchAll) {
+    auto config_base = makeConfigBase("type=db1");
+
+    // Add two audit entries to the database. The server should load
+    // the entire configuration from the database regardless of the
+    // existing audit entries. However, the last audit entry timestamp
+    // should be set to the most recent audit entry in the
+    // @c CBControlBase.
+    ASSERT_TRUE(cb_ctl_.databaseConfigConnect(config_base));
+
+    cb_ctl_.getMgr().getPool()->addAuditEntry(BackendSelector::UNSPEC(),
+                                              ServerSelector::ALL(),
+                                              "sql_table_2",
+                                              1234,
+                                              timestamps_["yesterday"],
+                                              2345);
+
+    cb_ctl_.getMgr().getPool()->addAuditEntry(BackendSelector::UNSPEC(),
+                                              ServerSelector::ALL(),
+                                              "sql_table_1",
+                                              3456,
+                                              timestamps_["today"],
+                                              4567);
+
+    // Disconnect from the database in order to check that the
+    // databaseConfigFetch reconnects.
+    ASSERT_NO_THROW(cb_ctl_.databaseConfigDisconnect());
+
+    // Verify that various indicators are set to their initial values.
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+    ASSERT_EQ(BackendSelector::Type::MYSQL, cb_ctl_.getBackendSelector().getBackendType());
+    ASSERT_EQ(ServerSelector::Type::UNASSIGNED, cb_ctl_.getServerSelector().getType());
+    ASSERT_EQ(-1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+
+    // Connect to the database and fetch the configuration.
+    ASSERT_NO_THROW(cb_ctl_.databaseConfigFetch(config_base));
+
+    // There should be one invocation of the databaseConfigApply.
+    ASSERT_EQ(1, cb_ctl_.getMergesNum());
+    // Since this is full reconfiguration the audit entry collection
+    // passed to the databaseConfigApply should be empty.
+    EXPECT_EQ(0, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(BackendSelector::Type::UNSPEC, cb_ctl_.getBackendSelector().getBackendType());
+    EXPECT_EQ(ServerSelector::Type::ALL, cb_ctl_.getServerSelector().getType());
+    // Make sure that the internal timestamp is set to the most recent
+    // audit entry, so as the server will only later fetch config
+    // updates after this timestamp.
+    EXPECT_EQ(timestamps_["today"], cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(4567, cb_ctl_.getLastAuditRevisionId());
+}
+
+// This test verifies that the configuration can be fetched for a
+// specified server tag.
+TEST_F(CBControlBaseTest, fetchFromServer) {
+    auto config_base = makeConfigBase("type=db1");
+    // Set a server tag.
+    config_base->setServerTag("a-tag");
+
+    // Verify that various indicators are set to their initial values.
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+    ASSERT_EQ(BackendSelector::Type::MYSQL, cb_ctl_.getBackendSelector().getBackendType());
+    ASSERT_EQ(ServerSelector::Type::UNASSIGNED, cb_ctl_.getServerSelector().getType());
+    ASSERT_EQ(-1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+
+    ASSERT_NO_THROW(cb_ctl_.databaseConfigFetch(config_base));
+
+    ASSERT_EQ(1, cb_ctl_.getMergesNum());
+    EXPECT_EQ(0, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(BackendSelector::Type::UNSPEC, cb_ctl_.getBackendSelector().getBackendType());
+    // An explicit server selector should have been used this time.
+    ASSERT_EQ(ServerSelector::Type::SUBSET, cb_ctl_.getServerSelector().getType());
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+
+    // Make sure that the server selector used in databaseConfigFetch is
+    // correct.
+    auto tags = cb_ctl_.getServerSelector().getTags();
+    ASSERT_EQ(1, tags.size());
+    EXPECT_EQ("a-tag", tags.begin()->get());
+}
+
+// This test verifies that incremental configuration changes can be
+// fetched.
+TEST_F(CBControlBaseTest, fetchUpdates) {
+    auto config_base = makeConfigBase("type=db1");
+
+    // Connect to the database and store an audit entry. Do not close
+    // the database connection to simulate the case when the server
+    // uses existing connection to fetch configuration updates.
+    ASSERT_TRUE(cb_ctl_.databaseConfigConnect(config_base));
+    cb_ctl_.getMgr().getPool()->addAuditEntry(BackendSelector::UNSPEC(),
+                                              ServerSelector::ALL(),
+                                              "sql_table_1",
+                                              3456,
+                                              timestamps_["today"],
+                                              4567);
+
+    // Verify that various indicators are set to their initial values.
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+    ASSERT_EQ(BackendSelector::Type::MYSQL, cb_ctl_.getBackendSelector().getBackendType());
+    ASSERT_EQ(ServerSelector::Type::UNASSIGNED, cb_ctl_.getServerSelector().getType());
+    ASSERT_EQ(-1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+
+    ASSERT_NO_THROW(cb_ctl_.databaseConfigFetch(config_base,
+                                                CBControl::FetchMode::FETCH_UPDATE));
+
+    // There should be one invocation to databaseConfigApply recorded.
+    ASSERT_EQ(1, cb_ctl_.getMergesNum());
+    // The number of audit entries passed to this function should be 1.
+    EXPECT_EQ(1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(BackendSelector::Type::UNSPEC, cb_ctl_.getBackendSelector().getBackendType());
+    EXPECT_EQ(ServerSelector::Type::ALL, cb_ctl_.getServerSelector().getType());
+    // The last audit entry time should be set to the latest audit entry.
+    EXPECT_EQ(timestamps_["today"], cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(4567, cb_ctl_.getLastAuditRevisionId());
+}
+
+// Check that the databaseConfigApply function is not called when there
+// are no more unprocessed audit entries.
+TEST_F(CBControlBaseTest, fetchNoUpdates) {
+    auto config_base = makeConfigBase("type=db1");
+
+    // Set last audit entry time to the timestamp of the audit
+    // entry we are going to add. That means that there will be
+    // no new audit entries to fetch.
+    cb_ctl_.setLastAuditRevisionTime(timestamps_["yesterday"]);
+    cb_ctl_.setLastAuditRevisionId(4567);
+
+    ASSERT_TRUE(cb_ctl_.databaseConfigConnect(config_base));
+
+    cb_ctl_.getMgr().getPool()->addAuditEntry(BackendSelector::UNSPEC(),
+                                              ServerSelector::ALL(),
+                                              "sql_table_1",
+                                              3456,
+                                              timestamps_["yesterday"],
+                                              4567);
+
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+
+    ASSERT_NO_THROW(cb_ctl_.databaseConfigFetch(config_base,
+                                                CBControl::FetchMode::FETCH_UPDATE));
+
+    // The databaseConfigApply should not be called because there are
+    // no new audit entires to process.
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+}
+
+// This test verifies that database config fetch failures are handled
+// gracefully.
+TEST_F(CBControlBaseTest, fetchFailure) {
+    auto config_base = makeConfigBase("type=db1");
+
+    // Connect to the database and store an audit entry. Do not close
+    // the database connection to simulate the case when the server
+    // uses existing connection to fetch configuration updates.
+    ASSERT_TRUE(cb_ctl_.databaseConfigConnect(config_base));
+    cb_ctl_.getMgr().getPool()->addAuditEntry(BackendSelector::UNSPEC(),
+                                              ServerSelector::ALL(),
+                                              "sql_table_1",
+                                              3456,
+                                              timestamps_["today"],
+                                              4567);
+
+    // Configure the CBControl to always throw simulating the failure
+    // during configuration merge.
+    cb_ctl_.enableThrow();
+
+    // Verify that various indicators are set to their initial values.
+    ASSERT_EQ(0, cb_ctl_.getMergesNum());
+    ASSERT_EQ(BackendSelector::Type::MYSQL, cb_ctl_.getBackendSelector().getBackendType());
+    ASSERT_EQ(ServerSelector::Type::UNASSIGNED, cb_ctl_.getServerSelector().getType());
+    ASSERT_EQ(-1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+
+    ASSERT_THROW(cb_ctl_.databaseConfigFetch(config_base, CBControl::FetchMode::FETCH_UPDATE),
+                 isc::Unexpected);
+
+    // There should be one invocation to databaseConfigApply recorded.
+    ASSERT_EQ(1, cb_ctl_.getMergesNum());
+    // The number of audit entries passed to this function should be 1.
+    EXPECT_EQ(1, cb_ctl_.getAuditEntriesNum());
+    EXPECT_EQ(BackendSelector::Type::UNSPEC, cb_ctl_.getBackendSelector().getBackendType());
+    EXPECT_EQ(ServerSelector::Type::ALL, cb_ctl_.getServerSelector().getType());
+    // The last audit entry time should not be modified because there was a merge
+    // error.
+    EXPECT_EQ(cb_ctl_.getInitialAuditRevisionTime(), cb_ctl_.getLastAuditRevisionTime());
+    EXPECT_EQ(0, cb_ctl_.getLastAuditRevisionId());
+}
+
+}
diff --git a/src/lib/process/tests/config_base_unittests.cc b/src/lib/process/tests/config_base_unittests.cc
new file mode 100644
index 0000000..cec4582
--- /dev/null
+++ b/src/lib/process/tests/config_base_unittests.cc
@@ -0,0 +1,230 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <process/config_base.h>
+#include <util/optional.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::process;
+using namespace isc::util;
+
+/// @brief Derived ConfigBase class
+/// We use this derivation to test the
+/// copy and equality functions.
+class ConfigBaseImpl : public ConfigBase {
+public:
+    void
+    copy(ConfigBaseImpl& other) const {
+        ConfigBase::copy(other);
+    }
+};
+
+// Verifies construction, copy, and equality of
+// ConfigBase with respect to ConfigControInfo.
+TEST(ConfigBase, configControlInfoTests) {
+
+    // Create a control info instance
+    ConfigControlInfoPtr ctl_info1(new ConfigControlInfo());
+    ctl_info1->addConfigDatabase("type=mysql host=example.com");
+    ctl_info1->addConfigDatabase("type=mysql host=example2.com");
+
+    // Create a ConfigBase
+    ConfigBaseImpl base1;
+    base1.setConfigControlInfo(ctl_info1);
+
+    // Clone the ConfigBase
+    ConfigBaseImpl base2;
+    base1.copy(base2);
+
+    // They should be equal.
+    EXPECT_TRUE(base1.equals(base2));
+
+    // Reset control info for one of them.
+    base1.setConfigControlInfo(ConfigControlInfoPtr());
+
+    // They should not be equal.
+    EXPECT_FALSE(base1.equals(base2));
+
+    // Reset control info for the other one.
+    base2.setConfigControlInfo(ConfigControlInfoPtr());
+
+    // They should be equal again.
+    EXPECT_TRUE(base1.equals(base2));
+}
+
+// Verifies that logging information can be merged to another.
+TEST(ConfigBase, mergeLoggingInfo) {
+    // Create first logging info.
+    LoggingInfo log_info1;
+    log_info1.name_ = "foo";
+
+    // Create second logging info.
+    LoggingInfo log_info2;
+    log_info2.name_ = "bar";
+
+    // Create first config base instance.
+    ConfigBaseImpl base1;
+    base1.addLoggingInfo(log_info1);
+
+    // Copy the first instance to keep it as reference.
+    ConfigBaseImpl base1_copy;
+    base1_copy.copy(base1);
+
+    // Create second config base instance.
+    ConfigBaseImpl base2;
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_TRUE(base1.equals(base1_copy));
+
+    // Set some data for the second config.
+    base2.addLoggingInfo(log_info2);
+
+    // This time the merge should replace the original config.
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_TRUE(base1.equals(base2));
+}
+
+// Verifies that config control can be merged to another.
+TEST(ConfigBase, mergeConfigControl) {
+    // Create first config control info.
+    ConfigControlInfoPtr ctl_info1(new ConfigControlInfo());
+    ctl_info1->addConfigDatabase("type=mysql host=example.com");
+    ctl_info1->addConfigDatabase("type=mysql host=example2.com");
+
+    // Create second config control info.
+    ConfigControlInfoPtr ctl_info2(new ConfigControlInfo());
+    ctl_info2->addConfigDatabase("type=pgsql host=example.com");
+    ctl_info2->addConfigDatabase("type=pgsql host=example2.com");
+
+    // Create first config base instance.
+    ConfigBaseImpl base1;
+    base1.setConfigControlInfo(ctl_info1);
+
+    // Copy the first instance to keep it as reference.
+    ConfigBaseImpl base1_copy;
+    base1_copy.copy(base1);
+
+    // Create second config base instance.
+    ConfigBaseImpl base2;
+
+    // Merged base is empty, so the original should be preserved.
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_TRUE(base1.equals(base1_copy));
+
+    // Set some data for the second config.
+    base2.setConfigControlInfo(ctl_info2);
+
+    // This time the merge should replace the original config.
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_TRUE(base1.equals(base2));
+}
+
+// Verifies that server-tag may be configured.
+TEST(ConfigBase, serverTag) {
+    ConfigBaseImpl conf;
+
+    // Check that the default is an unspecified and empty string.
+    EXPECT_TRUE(conf.getServerTag().unspecified());
+    EXPECT_TRUE(conf.getServerTag().empty());
+
+    // Check that it can be modified.
+    conf.setServerTag("boo");
+    EXPECT_FALSE(conf.getServerTag().unspecified());
+    EXPECT_EQ("boo", conf.getServerTag().get());
+}
+
+// Verifies that server tag can be merged to another config.
+TEST(ConfigBase, mergeServerTag) {
+    ConfigBaseImpl base1;
+    ConfigBaseImpl base2;
+
+    // Initially the server tags in both config should be
+    // unspecified.
+    EXPECT_TRUE(base1.getServerTag().unspecified());
+    EXPECT_TRUE(base2.getServerTag().unspecified());
+
+    // Merging the config with unspecified server tag should
+    // not modify the target config.
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_TRUE(base1.getServerTag().unspecified());
+    EXPECT_TRUE(base2.getServerTag().unspecified());
+
+    // Set server tag for base2 and merge it.
+    base2.setServerTag(std::string("base2"));
+    ASSERT_NO_THROW(base1.merge(base2));
+
+    // The server tag should be copied into the base1. Both
+    // should now be unspecified.
+    EXPECT_FALSE(base1.getServerTag().unspecified());
+    EXPECT_FALSE(base2.getServerTag().unspecified());
+
+    // They should also hold the same value.
+    EXPECT_EQ("base2", base1.getServerTag().get());
+    EXPECT_EQ("base2", base2.getServerTag().get());
+
+    // Reset the server tag to unspecified.
+    base2.setServerTag(Optional<std::string>());
+    EXPECT_FALSE(base1.getServerTag().unspecified());
+    EXPECT_TRUE(base2.getServerTag().unspecified());
+
+    // Merging the config with unspecified server tag should
+    // result in no change in the target config.
+    ASSERT_NO_THROW(base1.merge(base2));
+    EXPECT_FALSE(base1.getServerTag().unspecified());
+    EXPECT_TRUE(base2.getServerTag().unspecified());
+
+    // The server tag should remain the same.
+    EXPECT_EQ("base2", base1.getServerTag().get());
+
+    // Set the explicit server tag in the source config.
+    base2.setServerTag("new-base2");
+
+    // Merge again.
+    ASSERT_NO_THROW(base1.merge(base2));
+
+    // The new value should be stored in the target config, so
+    // both should be specified and have the same value.
+    EXPECT_FALSE(base1.getServerTag().unspecified());
+    EXPECT_FALSE(base2.getServerTag().unspecified());
+    EXPECT_EQ("new-base2", base1.getServerTag().get());
+    EXPECT_EQ("new-base2", base2.getServerTag().get());
+}
+
+// Verifies that server tag can be copied to another config.
+TEST(ConfigBase, copyServerTag) {
+    ConfigBaseImpl base1;
+    ConfigBaseImpl base2;
+
+    // Set server tag for the base2.
+    base2.setServerTag(std::string("base2"));
+
+    // The base1 has server tag unspecified. Copying it to the
+    // base2 should result in unspecified server tag in base2.
+    ASSERT_NO_THROW(base1.copy(base2));
+    EXPECT_TRUE(base2.getServerTag().unspecified());
+
+    // Set server tag for base1 and copy it to base2.
+    base1.setServerTag(std::string("base1"));
+    ASSERT_NO_THROW(base1.copy(base2));
+
+    // The base2 should now hold the value from base1.
+    EXPECT_FALSE(base2.getServerTag().unspecified());
+    EXPECT_EQ("base1", base2.getServerTag().get());
+
+    // Set base1 value to a different value.
+    base1.setServerTag(std::string("new-base1"));
+
+    // Copy again.
+    ASSERT_NO_THROW(base1.copy(base2));
+
+    // It should override the value in the base2.
+    EXPECT_FALSE(base2.getServerTag().unspecified());
+    EXPECT_EQ("new-base1", base2.getServerTag().get());
+}
diff --git a/src/lib/process/tests/config_ctl_info_unittests.cc b/src/lib/process/tests/config_ctl_info_unittests.cc
new file mode 100644
index 0000000..7c78014
--- /dev/null
+++ b/src/lib/process/tests/config_ctl_info_unittests.cc
@@ -0,0 +1,180 @@
+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <process/config_ctl_info.h>
+#include <exceptions/exceptions.h>
+
+#include <gtest/gtest.h>
+
+#include <sstream>
+#include <iostream>
+
+using namespace isc::process;
+using namespace isc::data;
+using namespace isc::util;
+
+// Verifies initializing via an access string and unparsing into elements
+// We just test basic unparsing, as more rigorous testing is done in
+// libkea-db testing which ConfigDBInfo uses.
+TEST(ConfigDbInfo, basicOperation) {
+    ConfigDbInfo db;
+    std::string access = "type=mysql user=tom password=terrific";
+    std::string redacted_access = "password=***** type=mysql user=tom";
+    std::string access_json = "{\n"
+        " \"type\":\"mysql\", \n"
+        " \"user\":\"tom\", \n"
+        " \"password\":\"terrific\" \n"
+        "} \n";
+
+    // Convert the above configuration into Elements for comparison.
+    ElementPtr exp_elems;
+    ASSERT_NO_THROW(exp_elems = Element::fromJSON(access_json))
+        << "test is broken";
+
+    // Initialize the db from an the access string
+    db.setAccessString(access);
+    EXPECT_EQ(access, db.getAccessString());
+
+    EXPECT_EQ(redacted_access, db.redactedAccessString());
+
+    // Convert the db into Elements and make sure they are as expected.
+    ElementPtr db_elems;
+    ASSERT_NO_THROW(db_elems = db.toElement());
+    EXPECT_TRUE(db_elems->equals(*exp_elems));
+}
+
+// Verify that db parameter values may be retrieved.
+TEST(ConfigDbInfo, getParameterValue) {
+    ConfigDbInfo db1;
+    std::string access1 = "type=mysql name=keatest port=33 readonly=false";
+    db1.setAccessString(access1);
+
+    std::string value;
+    bool found = false;
+
+    // Should find "type"
+    ASSERT_NO_THROW(found = db1.getParameterValue("type", value));
+    EXPECT_TRUE(found);
+    EXPECT_EQ("mysql", value);
+
+    // Should find "name"
+    ASSERT_NO_THROW(found = db1.getParameterValue("name", value));
+    EXPECT_TRUE(found);
+    EXPECT_EQ("keatest", value);
+
+    // Should find "port"
+    ASSERT_NO_THROW(found = db1.getParameterValue("port", value));
+    EXPECT_TRUE(found);
+    EXPECT_EQ("33", value);
+
+    // Should find "readonly"
+    ASSERT_NO_THROW(found = db1.getParameterValue("readonly", value));
+    EXPECT_TRUE(found);
+    EXPECT_EQ("false", value);
+
+    // Should not find "bogus"
+    ASSERT_NO_THROW(found = db1.getParameterValue("bogus", value));
+    EXPECT_FALSE(found);
+}
+
+// Verify that db equality operators work correctly.
+TEST(ConfigDbInfo, equalityOperators) {
+    ConfigDbInfo db1;
+    std::string access1 = "type=mysql user=tom password=terrific";
+    ASSERT_NO_THROW(db1.setAccessString(access1));
+
+    ConfigDbInfo db2;
+    std::string access2 = "type=postgresql user=tom password=terrific";
+    ASSERT_NO_THROW(db2.setAccessString(access2));
+
+    // Verify that the two unequal dbs are in fact not equal.
+    EXPECT_FALSE(db1.equals(db2));
+    EXPECT_FALSE(db1 == db2);
+    EXPECT_TRUE(db1 != db2);
+
+    // Verify that the two equal dbs are in fact equal.
+    db2.setAccessString(access1);
+    EXPECT_TRUE(db1.equals(db2));
+    EXPECT_TRUE(db1 == db2);
+    EXPECT_FALSE(db1 != db2);
+}
+
+// Verifies the basic operations of ConfigControlInfo
+TEST(ConfigControlInfo, basicOperation) {
+
+    ConfigControlInfo ctl;
+    // We should have no dbs in the list.
+    EXPECT_EQ(0, ctl.getConfigDatabases().size());
+    // The default fetch time is 30 and it is unspecified.
+    EXPECT_TRUE(ctl.getConfigFetchWaitTime().unspecified());
+    EXPECT_EQ(30, ctl.getConfigFetchWaitTime().get());
+
+    // Override the default fetch time.
+    ctl.setConfigFetchWaitTime(Optional<uint16_t>(123));
+    EXPECT_EQ(123, ctl.getConfigFetchWaitTime().get());
+
+    // We should be able to add two distinct, valid dbs
+    std::string access_str1 = "type=mysql host=machine1.org";
+    ASSERT_NO_THROW(ctl.addConfigDatabase(access_str1));
+
+    std::string access_str2 = "type=postgresql host=machine2.org";
+    ASSERT_NO_THROW(ctl.addConfigDatabase(access_str2));
+
+    // We should fail on a duplicate db.
+    ASSERT_THROW(ctl.addConfigDatabase(access_str1), isc::BadValue);
+
+    // We should have two dbs in the list.
+    const ConfigDbInfoList& db_list = ctl.getConfigDatabases();
+    EXPECT_EQ(2, db_list.size());
+
+    // Verify the dbs in the list are as we expect them to be.
+    EXPECT_EQ (access_str1, db_list[0].getAccessString());
+    EXPECT_EQ (access_str2, db_list[1].getAccessString());
+
+    // Verify we can find dbs based on a property values.
+    const ConfigDbInfo& db_info = ctl.findConfigDb("type", "mysql");
+    EXPECT_FALSE(db_info == ConfigControlInfo::EMPTY_DB());
+    EXPECT_EQ (access_str1, db_info.getAccessString());
+
+    const ConfigDbInfo& db_info2 = ctl.findConfigDb("host", "machine2.org");
+    EXPECT_FALSE(db_info2 == ConfigControlInfo::EMPTY_DB());
+    EXPECT_EQ (access_str2, db_info2.getAccessString());
+
+    // Verify not finding a db returns EMPTY_DB().
+    const ConfigDbInfo& db_info3 = ctl.findConfigDb("type", "bogus");
+    EXPECT_TRUE(db_info3 == ConfigControlInfo::EMPTY_DB());
+
+    // Verify we can clear the list of dbs and the fetch time.
+    ctl.clear();
+    EXPECT_EQ(0, ctl.getConfigDatabases().size());
+    EXPECT_TRUE(ctl.getConfigFetchWaitTime().unspecified());
+    EXPECT_EQ(30, ctl.getConfigFetchWaitTime().get());
+}
+
+// Verifies the copy ctor and equality functions ConfigControlInfo
+TEST(ConfigControlInfo, copyAndEquality) {
+
+    // Make an instance with two dbs.
+    ConfigControlInfo ctl1;
+    ASSERT_NO_THROW(ctl1.addConfigDatabase("type=mysql host=mach1.org"));
+    ASSERT_NO_THROW(ctl1.addConfigDatabase("type=postgresql host=mach2.org"));
+    ctl1.setConfigFetchWaitTime(Optional<uint16_t>(123));
+
+    // Clone that instance.
+    ConfigControlInfo ctl2(ctl1);
+
+    // They should be equal.
+    EXPECT_TRUE(ctl1.equals(ctl2));
+
+    // Make a third instance with a different db.
+    ConfigControlInfo ctl3;
+    ASSERT_NO_THROW(ctl1.addConfigDatabase("type=mysql host=other.org"));
+
+    // They should not equal.
+    EXPECT_FALSE(ctl3.equals(ctl1));
+}
+
diff --git a/src/lib/process/tests/config_ctl_parser_unittests.cc b/src/lib/process/tests/config_ctl_parser_unittests.cc
new file mode 100644
index 0000000..8e5b328
--- /dev/null
+++ b/src/lib/process/tests/config_ctl_parser_unittests.cc
@@ -0,0 +1,102 @@
+// Copyright (C) 2018-2019 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <cc/dhcp_config_error.h>
+#include <process/config_ctl_parser.h>
+#include <exceptions/exceptions.h>
+
+#include <gtest/gtest.h>
+
+#include <sstream>
+#include <iostream>
+
+using namespace isc::process;
+using namespace isc::data;
+
+// Verifies valid configurations are parsed correctly.  The test
+// uses round-trip comparison of configuration Elements to determine
+// if parsing was correct.
+TEST(ConfigCtlInfoParser, validConfigs) {
+    std::string configs[] = {
+       "{}",
+
+       "{ \"config-databases\": [], \n"
+       "  \"config-fetch-wait-time\": 20 \n"
+       "}",
+
+       "{ \"config-databases\": [ \n"
+       "    { \n"
+       "        \"type\": \"mysql\", \n"
+       "        \"user\":\"tom\", \n"
+       "        \"password\":\"terrific\" \n"
+       "    }, \n"
+       "    { \n"
+       "        \"type\": \"postgresql\",\n"
+       "        \"user\":\"bob\", \n"
+       "        \"password\":\"wonder\" \n"
+       "    } \n"
+       "] } \n"
+    };
+
+    for (auto config : configs) {
+        ConfigControlParser parser;
+        ConfigControlInfoPtr ctl_info;
+
+        // Turn the JSON config into Elements.
+        ElementPtr source_elem;
+        ASSERT_NO_THROW (source_elem = Element::fromJSON(config)) <<
+                " JSON error, test is broken: " << config;
+
+        // Parse the Elements into a ConfigControlInfo.
+        ASSERT_NO_THROW(ctl_info = parser.parse(source_elem));
+        ASSERT_TRUE(ctl_info);
+
+        // Turn the newly constructed info instance back into elements.
+        ElementPtr parsed_elem;
+        ASSERT_NO_THROW(parsed_elem = ctl_info->toElement());
+
+        // When the config is empty, ControlConfigInfo::toElement still
+        // generates a map with an empty db list.  Replace source for
+        // element comparison below.
+        if (source_elem->size() == 0) {
+            ASSERT_NO_THROW (source_elem = Element::fromJSON(
+                            "{ \"config-databases\": [] }"));
+        }
+
+        // The parsed element should match the source element.
+        EXPECT_TRUE(parsed_elem->equals(*source_elem)) << "config: " << config;
+    }
+}
+
+// Verify that invalid configurations fail to parse gracefully.
+TEST(ConfigCtlInfoParser, invalidConfigs) {
+    // Note that configurations are must be valid JSON, but invalid logically.
+    std::string configs[] = {
+       "{ \"config-databases\": \"not_list\" }",
+       "{ \"config-databases\": [ \n"
+       "    { \n"
+       "        \"bogus\": \"param\" \n"
+       "    } \n"
+       "] } \n",
+       "{ \"config-fetch-wait-time\": -1 }",
+       "{ \"config-fetch-wait-time\": 65537 }",
+       "{ \"config-fetch-wait-time\": \"a-string\" }",
+    };
+
+    for (auto config : configs) {
+        ConfigControlParser parser;
+
+        // Turn the JSON config into Elements.
+        ElementPtr source_elem;
+        ASSERT_NO_THROW (source_elem = Element::fromJSON(config)) <<
+                " JSON error, test is broken: " << config;
+
+        // Parse the Elements into a ConfigControlInfo.
+        ASSERT_THROW(parser.parse(source_elem), isc::ConfigError)
+                     << "config: " << config;
+    }
+}
diff --git a/src/lib/process/tests/d_cfg_mgr_unittests.cc b/src/lib/process/tests/d_cfg_mgr_unittests.cc
new file mode 100644
index 0000000..faa3e92
--- /dev/null
+++ b/src/lib/process/tests/d_cfg_mgr_unittests.cc
@@ -0,0 +1,375 @@
+// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/command_interpreter.h>
+#include <exceptions/exceptions.h>
+#include <process/testutils/d_test_stubs.h>
+#include <process/d_cfg_mgr.h>
+#include <process/redact_config.h>
+
+#include <boost/foreach.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+
+#include <sstream>
+
+using namespace std;
+using namespace isc;
+using namespace isc::config;
+using namespace isc::process;
+using namespace isc::data;
+using namespace boost::posix_time;
+
+namespace {
+
+/// @brief Test Class for verifying that configuration context cannot be null
+/// during construction.
+class DCtorTestCfgMgr : public DCfgMgrBase {
+public:
+    /// @brief Constructor - Note that is passes in an empty configuration
+    /// pointer to the base class constructor.
+    DCtorTestCfgMgr() : DCfgMgrBase(ConfigPtr()) {
+    }
+
+    /// @brief Destructor
+    virtual ~DCtorTestCfgMgr() {
+    }
+
+    /// @brief Dummy implementation as this method is abstract.
+    virtual ConfigPtr createNewContext() {
+        return (ConfigPtr());
+    }
+
+    /// @brief Returns summary of configuration in the textual format.
+    virtual std::string getConfigSummary(const uint32_t) {
+        return ("");
+    }
+};
+
+/// @brief Test fixture class for testing DCfgMgrBase class.
+/// It maintains an member instance of DStubCfgMgr and derives from
+/// ConfigParseTest fixture, thus providing methods for converting JSON
+/// strings to configuration element sets, checking parse results,
+/// accessing the configuration context and trying to unparse.
+class DStubCfgMgrTest : public ConfigParseTest {
+public:
+
+    /// @brief Constructor
+    DStubCfgMgrTest():cfg_mgr_(new DStubCfgMgr) {
+    }
+
+    /// @brief Destructor
+    ~DStubCfgMgrTest() {
+    }
+
+    /// @brief Convenience method which returns a DStubContextPtr to the
+    /// configuration context.
+    ///
+    /// @return returns a DStubContextPtr.
+    DStubContextPtr getStubContext() {
+        return (boost::dynamic_pointer_cast<DStubContext>
+                (cfg_mgr_->getContext()));
+    }
+
+    /// @brief Configuration manager instance.
+    DStubCfgMgrPtr cfg_mgr_;
+};
+
+///@brief Tests basic construction/destruction of configuration manager.
+/// Verifies that:
+/// 1. Proper construction succeeds.
+/// 2. Configuration context is initialized by construction.
+/// 3. Destruction works properly.
+/// 4. Construction with a null context is not allowed.
+TEST(DCfgMgrBase, construction) {
+    DCfgMgrBasePtr cfg_mgr;
+
+    // Verify that configuration manager constructions without error.
+    ASSERT_NO_THROW(cfg_mgr.reset(new DStubCfgMgr()));
+
+    // Verify that the context can be retrieved and is not null.
+    ConfigPtr context = cfg_mgr->getContext();
+    EXPECT_TRUE(context);
+
+    // Verify that the manager can be destructed without error.
+    EXPECT_NO_THROW(cfg_mgr.reset());
+
+    // Verify that an attempt to construct a manger with a null context fails.
+    ASSERT_THROW(DCtorTestCfgMgr(), DCfgMgrBaseError);
+}
+
+///@brief Tests fundamental aspects of configuration parsing.
+/// Verifies that:
+/// 1. A correctly formed simple configuration parses without error.
+/// 2. An error building the element is handled.
+/// 3. An error committing the element is handled.
+/// 4. An unknown element error is handled.
+TEST_F(DStubCfgMgrTest, basicParseTest) {
+    // Create a simple configuration.
+    string config = "{ \"test-value\": [] } ";
+    ASSERT_TRUE(fromJSON(config));
+
+    // Verify that we can parse a simple configuration.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    EXPECT_TRUE(checkAnswer(0));
+
+    // Verify that we can check a simple configuration.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, true);
+    EXPECT_TRUE(checkAnswer(0));
+}
+
+/// @brief Tests that element ids supported by the base class as well as those
+/// added by the derived class function properly.
+/// This test verifies that:
+/// 1. Boolean parameters can be parsed and retrieved.
+/// 2. Uint32 parameters can be parsed and retrieved.
+/// 3. String parameters can be parsed and retrieved.
+/// 4. Map elements can be parsed and retrieved.
+/// 5. List elements can be parsed and retrieved.
+/// 6. Parsing a second configuration, updates the existing context values
+/// correctly.
+TEST_F(DStubCfgMgrTest, simpleTypesTest) {
+    // Create a configuration with all of the parameters.
+    string config = "{ \"bool_test\": true , "
+                    "  \"uint32_test\": 77 , "
+                    "  \"string_test\": \"hmmm chewy\" , "
+                    "  \"map_test\" : {} , "
+                    "  \"list_test\": [] }";
+    ASSERT_TRUE(fromJSON(config));
+
+    // Verify that the configuration parses without error.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    ASSERT_TRUE(checkAnswer(0));
+    DStubContextPtr context = getStubContext();
+    ASSERT_TRUE(context);
+
+    // Create a configuration which "updates" all of the parameter values.
+    string config2 = "{ \"bool_test\": false , "
+                    "  \"uint32_test\": 88 , "
+                    "  \"string_test\": \"ewww yuk!\" , "
+                    "  \"map_test2\" : {} , "
+                    "  \"list_test2\": [] }";
+    ASSERT_TRUE(fromJSON(config2));
+
+    // Verify that the configuration parses without error.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    EXPECT_TRUE(checkAnswer(0));
+    context = getStubContext();
+    ASSERT_TRUE(context);
+}
+
+/// @brief Tests that the configuration context is preserved after failure
+/// during parsing causes a rollback.
+/// 1. Verifies configuration context rollback.
+TEST_F(DStubCfgMgrTest, rollBackTest) {
+    // Create a configuration with all of the parameters.
+    string config = "{ \"bool_test\": true , "
+                    "  \"uint32_test\": 77 , "
+                    "  \"string_test\": \"hmmm chewy\" , "
+                    "  \"map_test\" : {} , "
+                    "  \"list_test\": [] }";
+    ASSERT_TRUE(fromJSON(config));
+
+    // Verify that the configuration parses without error.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    EXPECT_TRUE(checkAnswer(0));
+    DStubContextPtr context = getStubContext();
+    ASSERT_TRUE(context);
+
+    // Create a configuration which "updates" all of the parameter values
+    // plus one unknown at the end.
+    string config2 = "{ \"bool_test\": false , "
+                    "  \"uint32_test\": 88 , "
+                    "  \"string_test\": \"ewww yuk!\" , "
+                    "  \"map_test2\" : {} , "
+                    "  \"list_test2\": [] , "
+                    "  \"zeta_unknown\": 33 } ";
+    ASSERT_TRUE(fromJSON(config2));
+}
+
+/// @brief Tests that the configuration context is preserved during
+/// check only  parsing.
+TEST_F(DStubCfgMgrTest, checkOnly) {
+    // Create a configuration with all of the parameters.
+    string config = "{ \"bool_test\": true , "
+                    "  \"uint32_test\": 77 , "
+                    "  \"string_test\": \"hmmm chewy\" , "
+                    "  \"map_test\" : {} , "
+                    "  \"list_test\": [] }";
+    ASSERT_TRUE(fromJSON(config));
+
+    // Verify that the configuration parses without error.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    EXPECT_TRUE(checkAnswer(0));
+    DStubContextPtr context = getStubContext();
+    ASSERT_TRUE(context);
+
+
+    // Create a configuration which "updates" all of the parameter values.
+    string config2 = "{ \"bool_test\": false , "
+                    "  \"uint32_test\": 88 , "
+                    "  \"string_test\": \"ewww yuk!\" , "
+                    "  \"map_test2\" : {} , "
+                    "  \"list_test2\": [] }";
+    ASSERT_TRUE(fromJSON(config2));
+
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, true);
+    EXPECT_TRUE(checkAnswer(0));
+    context = getStubContext();
+    ASSERT_TRUE(context);
+
+}
+
+// Tests that configuration element position is returned by getParam variants.
+TEST_F(DStubCfgMgrTest, paramPosition) {
+    // Create a configuration with one of each scalar types.  We end them
+    // with line feeds so we can test position value.
+    string config = "{ \"bool_test\": true , \n"
+                    "  \"uint32_test\": 77 , \n"
+                    "  \"string_test\": \"hmmm chewy\" }";
+    ASSERT_TRUE(fromJSON(config));
+
+    // Verify that the configuration parses without error.
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    ASSERT_TRUE(checkAnswer(0));
+    DStubContextPtr context = getStubContext();
+    ASSERT_TRUE(context);
+
+}
+
+// This tests if some aspects of simpleParseConfig are behaving properly.
+// Thorough testing is only possible for specific implementations. This
+// is done for control agent (see CtrlAgentControllerTest tests in
+// src/bin/agent/tests/ctrl_agent_controller_unittest.cc for example).
+// Also, shell tests in src/bin/agent/ctrl_agent_process_tests.sh test
+// the whole CA process that uses simpleParseConfig. The alternative
+// would be to implement whole parser that would set the context
+// properly. The ROI for this is not worth the effort.
+TEST_F(DStubCfgMgrTest, simpleParseConfig) {
+    using namespace isc::data;
+
+    // Passing just null pointer should result in error return code
+    answer_ = cfg_mgr_->simpleParseConfig(ConstElementPtr(), false);
+    EXPECT_TRUE(checkAnswer(1));
+
+    // Ok, now try with a dummy, but valid json code
+    string config = "{ \"bool_test\": true , \n"
+                    "  \"uint32_test\": 77 , \n"
+                    "  \"string_test\": \"hmmm chewy\" }";
+    ASSERT_NO_THROW(fromJSON(config));
+
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false);
+    EXPECT_TRUE(checkAnswer(0));
+}
+
+// This test checks that the post configuration callback function is
+// executed by the simpleParseConfig function.
+TEST_F(DStubCfgMgrTest, simpleParseConfigWithCallback) {
+    string config = "{ \"bool_test\": true , \n"
+                    "  \"uint32_test\": 77 , \n"
+                    "  \"string_test\": \"hmmm chewy\" }";
+    ASSERT_NO_THROW(fromJSON(config));
+
+    answer_ = cfg_mgr_->simpleParseConfig(config_set_, false,
+                                          []() {
+        isc_throw(Unexpected, "unexpected configuration error");
+    });
+    EXPECT_TRUE(checkAnswer(1));
+}
+
+// This test checks that redactConfig works as expected.
+TEST_F(DStubCfgMgrTest, redactConfig) {
+    // Basic case.
+    string config = "{ \"foo\": 1 }";
+    ConstElementPtr elem;
+    ASSERT_NO_THROW(elem = Element::fromJSON(config));
+    ConstElementPtr ret;
+    ASSERT_NO_THROW(ret = redactConfig(elem));
+    EXPECT_EQ(ret->str(), elem->str());
+
+    // Verify redaction.
+    config = "{ \"password\": \"foo\", \"secret\": \"bar\" }";
+    ASSERT_NO_THROW(elem = Element::fromJSON(config));
+    ASSERT_NO_THROW(ret = redactConfig(elem));
+    string expected = "{ \"password\": \"*****\", \"secret\": \"*****\" }";
+    EXPECT_EQ(expected, ret->str());
+
+    // Verify that user context are skipped.
+    config = "{ \"user-context\": { \"password\": \"foo\" } }";
+    ASSERT_NO_THROW(elem = Element::fromJSON(config));
+    ASSERT_NO_THROW(ret = redactConfig(elem));
+    EXPECT_EQ(ret->str(), elem->str());
+
+    // Verify that only given subtrees are handled.
+    list<string> keys = { "foo" };
+    config = "{ \"foo\": { \"password\": \"foo\" }, ";
+    config += "\"next\": { \"secret\": \"bar\" } }";
+    ASSERT_NO_THROW(elem = Element::fromJSON(config));
+    ASSERT_NO_THROW(ret = redactConfig(elem, keys));
+    expected = "{ \"foo\": { \"password\": \"*****\" }, ";
+    expected += "\"next\": { \"secret\": \"bar\" } }";
+    EXPECT_EQ(expected, ret->str());
+}
+
+// Test that user context is not touched when configuration is redacted.
+TEST(RedactConfig, userContext) {
+    ConstElementPtr const config(Element::fromJSON(R"(
+        {
+            "some-database": {
+                "password": "sensitive",
+                "secret": "sensitive",
+                "user": "keatest",
+                "nested-map": {
+                    "password": "sensitive",
+                    "secret": "sensitive",
+                    "user": "keatest"
+                }
+            },
+            "user-context": {
+                "password": "keatest",
+                "secret": "keatest",
+                "user": "keatest",
+                "nested-map": {
+                    "password": "keatest",
+                    "secret": "keatest",
+                    "user": "keatest"
+                }
+            }
+        }
+    )"));
+    ConstElementPtr const expected(Element::fromJSON(R"(
+        {
+            "some-database": {
+                "password": "*****",
+                "secret": "*****",
+                "user": "keatest",
+                "nested-map": {
+                    "password": "*****",
+                    "secret": "*****",
+                    "user": "keatest"
+                }
+            },
+            "user-context": {
+                "password": "keatest",
+                "secret": "keatest",
+                "user": "keatest",
+                "nested-map": {
+                    "password": "keatest",
+                    "secret": "keatest",
+                    "user": "keatest"
+                }
+            }
+        }
+    )"));
+    ConstElementPtr redacted(redactConfig(config));
+    EXPECT_TRUE(isEquivalent(redacted, expected))
+        << "Actual:\n" << prettyPrint(redacted) << "\n"
+           "Expected:\n" << prettyPrint(expected);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/process/tests/d_controller_unittests.cc b/src/lib/process/tests/d_controller_unittests.cc
new file mode 100644
index 0000000..4d7b73c
--- /dev/null
+++ b/src/lib/process/tests/d_controller_unittests.cc
@@ -0,0 +1,470 @@
+// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <kea_version.h>
+
+#include <asiolink/testutils/timed_signal.h>
+#include <cc/command_interpreter.h>
+#include <process/testutils/d_test_stubs.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <gtest/gtest.h>
+
+#include <sstream>
+
+using namespace isc::asiolink::test;
+using namespace boost::posix_time;
+
+namespace isc {
+namespace process {
+
+/// @brief Test fixture class for testing DControllerBase class. This class
+/// derives from DControllerTest and wraps a DStubController.  DStubController
+/// has been constructed to exercise DControllerBase.
+class DStubControllerTest : public DControllerTest {
+public:
+    /// @brief Constructor.
+    /// Note the constructor passes in the static DStubController instance
+    /// method.
+    DStubControllerTest() : DControllerTest(DStubController::instance) {
+        controller_ = boost::dynamic_pointer_cast<DStubController>
+                                                 (DControllerTest::
+                                                  getController());
+    }
+
+    /// @brief The controller.
+    DStubControllerPtr controller_;
+};
+
+/// @brief Basic Controller instantiation testing.
+/// Verifies that the controller singleton gets created and that the
+/// basic derivation from the base class is intact.
+TEST_F(DStubControllerTest, basicInstanceTesting) {
+    // Verify that the singleton exists and it is the correct type.
+    DControllerBasePtr& controller = DControllerTest::getController();
+    ASSERT_TRUE(controller);
+    ASSERT_NO_THROW(boost::dynamic_pointer_cast<DStubController>(controller));
+
+    // Verify that controller's app name is correct.
+    EXPECT_TRUE(checkAppName(DStubController::stub_app_name_));
+
+    // Verify that controller's bin name is correct.
+    EXPECT_TRUE(checkBinName(DStubController::stub_bin_name_));
+
+    // Verify that controller's IOService exists.
+    EXPECT_TRUE(checkIOService());
+
+    // Verify that the Process does NOT exist.
+    EXPECT_FALSE(checkProcess());
+}
+
+/// @brief Tests basic command line processing.
+/// Verifies that:
+/// 1. Standard command line options are supported.
+/// 2. Custom command line options are supported.
+/// 3. Invalid options are detected.
+/// 4. Extraneous command line information is detected.
+TEST_F(DStubControllerTest, commandLineArgs) {
+
+    // Verify that verbose flag is false initially.
+    EXPECT_TRUE(checkVerbose(false));
+
+    // Verify that standard options can be parsed without error.
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-c"),
+                     const_cast<char*>("cfgName"),
+                     const_cast<char*>("-d") };
+    int argc = 4;
+    EXPECT_NO_THROW(parseArgs(argc, argv));
+
+    // Verify that verbose is true.
+    EXPECT_TRUE(checkVerbose(true));
+
+    // Verify configuration file name is correct
+    EXPECT_TRUE(checkConfigFileName("cfgName"));
+
+    // Verify that the custom command line option is parsed without error.
+    char xopt[3] = "- ";
+    xopt[1] =  *DStubController::stub_option_x_;
+    char* argv1[] = { const_cast<char*>("progName"), xopt};
+    argc = 2;
+    EXPECT_NO_THROW (parseArgs(argc, argv1));
+
+    // Verify that an unknown option is detected.
+    char* argv2[] = { const_cast<char*>("progName"),
+                      const_cast<char*>("-bs") };
+    argc = 2;
+    EXPECT_THROW (parseArgs(argc, argv2), InvalidUsage);
+
+    // Verify that extraneous information is detected.
+    char* argv3[] = { const_cast<char*>("progName"),
+                      const_cast<char*>("extra"),
+                      const_cast<char*>("information") };
+    argc = 3;
+    EXPECT_THROW (parseArgs(argc, argv3), InvalidUsage);
+}
+
+/// @brief Tests application process creation and initialization.
+/// Verifies that:
+/// 1. An error during process creation is handled.
+/// 2. A NULL returned by process creation is handled.
+/// 3. An error during process initialization is handled.
+/// 4. Process can be successfully created and initialized.
+TEST_F(DStubControllerTest, initProcessTesting) {
+    // Verify that a failure during process creation is caught.
+    SimFailure::set(SimFailure::ftCreateProcessException);
+    EXPECT_THROW(initProcess(), DControllerBaseError);
+    EXPECT_FALSE(checkProcess());
+
+    // Verify that a NULL returned by process creation is handled.
+    SimFailure::set(SimFailure::ftCreateProcessNull);
+    EXPECT_THROW(initProcess(), DControllerBaseError);
+    EXPECT_FALSE(checkProcess());
+
+    // Re-create controller, verify that we are starting clean
+    resetController();
+    EXPECT_FALSE(checkProcess());
+
+    // Verify that an error during process initialization is handled.
+    SimFailure::set(SimFailure::ftProcessInit);
+    EXPECT_THROW(initProcess(), DProcessBaseError);
+
+    // Re-create controller, verify that we are starting clean
+    resetController();
+    EXPECT_FALSE(checkProcess());
+
+    // Verify that the application process can created and initialized.
+    ASSERT_NO_THROW(initProcess());
+    EXPECT_TRUE(checkProcess());
+}
+
+/// @brief Tests launch handling of invalid command line.
+/// This test launches with an invalid command line which should throw
+/// an InvalidUsage.
+TEST_F(DStubControllerTest, launchInvalidUsage) {
+    // Command line to run integrated
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-z") };
+    int argc = 2;
+
+    // Launch the controller in integrated mode.
+    EXPECT_THROW(launch(argc, argv), InvalidUsage);
+}
+
+/// @brief Tests launch handling of failure in application process
+/// initialization.  This test launches with a valid command line but with
+/// SimFailure set to fail during process creation.  Launch should throw
+/// ProcessInitError.
+TEST_F(DStubControllerTest, launchProcessInitError) {
+    // Command line to run integrated
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-c"),
+                     const_cast<char*>(DControllerTest::CFG_TEST_FILE),
+                     const_cast<char*>("-d") };
+    int argc = 4;
+
+    // Launch the controller in stand alone mode.
+    SimFailure::set(SimFailure::ftCreateProcessException);
+    EXPECT_THROW(launch(argc, argv), ProcessInitError);
+}
+
+/// @brief Tests launch and normal shutdown (stand alone mode).
+/// This creates an interval timer to generate a normal shutdown and then
+/// launches with a valid, command line, with a valid configuration file
+///  and no simulated errors.
+TEST_F(DStubControllerTest, launchNormalShutdown) {
+    // Write the valid, empty, config and then run launch() for 1000 ms
+    time_duration elapsed_time;
+    ASSERT_NO_THROW(runWithConfig("{}", 2000, elapsed_time));
+
+    // Verify that duration of the run invocation is the same as the
+    // timer duration.  This demonstrates that the shutdown was driven
+    // by an io_service event and callback.
+    EXPECT_TRUE(elapsed_time.total_milliseconds() >= 1900 &&
+                elapsed_time.total_milliseconds() <= 2300);
+}
+
+/// @brief A variant of the launch and normal shutdown test using a callback.
+TEST_F(DStubControllerTest, launchNormalShutdownWithCallback) {
+    // Write the valid, empty, config and then run launch() for 1000 ms
+    // Access to the internal state.
+    auto callback = [&] { EXPECT_FALSE(getProcess()->shouldShutdown()); };
+    time_duration elapsed_time;
+    ASSERT_NO_THROW(runWithConfig("{}", 2000,
+                                  static_cast<const TestCallback&>(callback),
+                                  elapsed_time));
+
+    // Verify that duration of the run invocation is the same as the
+    // timer duration.  This demonstrates that the shutdown was driven
+    // by an io_service event and callback.
+    EXPECT_TRUE(elapsed_time.total_milliseconds() >= 1900 &&
+                elapsed_time.total_milliseconds() <= 2300);
+}
+
+/// @brief Tests launch with an non-existing configuration file.
+TEST_F(DStubControllerTest, nonExistingConfigFile) {
+    // command line to run standalone
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-c"),
+                     const_cast<char*>("bogus-file"),
+                     const_cast<char*>("-d") };
+    int argc = 4;
+
+    // Record start time, and invoke launch().
+    EXPECT_THROW(launch(argc, argv), ProcessInitError);
+}
+
+/// @brief Tests launch with configuration file argument but no file name
+TEST_F(DStubControllerTest, missingConfigFileName) {
+    // command line to run standalone
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-c"),
+                     const_cast<char*>("-d") };
+    int argc = 3;
+
+    // Record start time, and invoke launch().
+    EXPECT_THROW(launch(argc, argv), ProcessInitError);
+}
+
+/// @brief Tests launch with no configuration file argument
+TEST_F(DStubControllerTest, missingConfigFileArgument) {
+    // command line to run standalone
+    char* argv[] = { const_cast<char*>("progName"),
+                     const_cast<char*>("-d") };
+    int argc = 2;
+
+    // Record start time, and invoke launch().
+    EXPECT_THROW(launch(argc, argv), LaunchError);
+}
+
+/// @brief Tests launch with an operational error during application execution.
+/// This test creates an interval timer to generate a runtime exception during
+/// the process event loop. It launches with a valid, stand-alone command line
+/// and no simulated errors.  Launch should throw ProcessRunError.
+TEST_F(DStubControllerTest, launchRuntimeError) {
+    // Use an asiolink IntervalTimer and callback to generate the
+    // shutdown invocation. (Note IntervalTimer setup is in milliseconds).
+    isc::asiolink::IntervalTimer timer(*getIOService());
+    timer.setup(genFatalErrorCallback, 2000);
+
+    // Write the valid, empty, config and then run launch() for 5000 ms
+    time_duration elapsed_time;
+    EXPECT_THROW(runWithConfig("{}", 5000, elapsed_time), ProcessRunError);
+
+    // Verify that duration of the run invocation is the same as the
+    // timer duration.  This demonstrates that the shutdown was driven
+    // by an io_service event and callback.
+    EXPECT_TRUE(elapsed_time.total_milliseconds() >= 1900 &&
+                elapsed_time.total_milliseconds() <= 2300);
+}
+
+/// @brief Configuration update event testing.
+/// This really tests just the ability of the handlers to invoke the necessary
+/// chain of methods and handle error conditions. Configuration parsing and
+/// retrieval should be tested as part of the d2 configuration management
+/// implementation.
+/// This test verifies that:
+/// 1. That a valid configuration update results in successful status return.
+/// 2. That an application process error in configuration updating is handled
+/// properly.
+TEST_F(DStubControllerTest, configUpdateTests) {
+    int rcode = -1;
+    isc::data::ConstElementPtr answer;
+
+    // Initialize the application process.
+    ASSERT_NO_THROW(initProcess());
+    EXPECT_TRUE(checkProcess());
+
+    // Create a configuration set. Content is arbitrary, just needs to be
+    // valid JSON.
+    std::string config = "{ \"test-value\": 1000 } ";
+    isc::data::ElementPtr config_set = isc::data::Element::fromJSON(config);
+
+    // Verify that a valid config gets a successful update result.
+    answer = updateConfig(config_set);
+    isc::config::parseAnswer(rcode, answer);
+    EXPECT_EQ(0, rcode);
+
+    // Verify that a valid config gets a successful check result.
+    answer = checkConfig(config_set);
+    isc::config::parseAnswer(rcode, answer);
+    EXPECT_EQ(0, rcode);
+
+    // Verify that an error in process configure method is handled.
+    SimFailure::set(SimFailure::ftProcessConfigure);
+    answer = updateConfig(config_set);
+    isc::config::parseAnswer(rcode, answer);
+    EXPECT_EQ(1, rcode);
+
+    // Verify that an error is handled too when the config is checked for.
+    SimFailure::set(SimFailure::ftProcessConfigure);
+    answer = checkConfig(config_set);
+    isc::config::parseAnswer(rcode, answer);
+    EXPECT_EQ(1, rcode);
+}
+
+// Tests that handleOtherObjects behaves as expected.
+TEST_F(DStubControllerTest, handleOtherObjects) {
+    using namespace isc::data;
+
+    // A bad config.
+    ElementPtr config = Element::createMap();
+    config->set(controller_->getAppName(), Element::create(1));
+    config->set("foo", Element::create(2));
+    config->set("bar", Element::create(3));
+
+    // Check the error message.
+    std::string errmsg;
+    EXPECT_NO_THROW(errmsg = controller_->handleOtherObjects(config));
+    EXPECT_EQ(" contains unsupported 'bar' parameter (and 'foo')", errmsg);
+
+    // Retry with no error.
+    config = Element::createMap();
+    config->set(controller_->getAppName(), Element::create(1));
+    EXPECT_NO_THROW(errmsg = controller_->handleOtherObjects(config));
+    EXPECT_TRUE(errmsg.empty());
+}
+
+// Tests that registered signals are caught and handled.
+TEST_F(DStubControllerTest, ioSignals) {
+    // Tell test controller just to record the signals, don't call the
+    // base class signal handler.
+    controller_->recordSignalOnly(true);
+
+    // Setup to raise SIGHUP in 10 ms.
+    TimedSignal sighup(*getIOService(), SIGHUP, 10);
+    TimedSignal sigint(*getIOService(), SIGINT, 100);
+    TimedSignal sigterm(*getIOService(), SIGTERM, 200);
+
+    // Write the valid, empty, config and then run launch() for 500 ms
+    time_duration elapsed_time;
+    runWithConfig("{}", 500, elapsed_time);
+
+    // Verify that we caught the signals as expected.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(3, signals.size());
+    EXPECT_EQ(SIGHUP, signals[0]);
+    EXPECT_EQ(SIGINT, signals[1]);
+    EXPECT_EQ(SIGTERM, signals[2]);
+}
+
+// Tests that the original configuration is retained after a SIGHUP triggered
+// reconfiguration fails due to invalid config content.
+TEST_F(DStubControllerTest, invalidConfigReload) {
+    // Schedule to rewrite the configuration file after launch. This way the
+    // file is updated after we have done the initial configuration.  The
+    // new content is invalid JSON which will cause the config parse to fail.
+    scheduleTimedWrite("{ \"string_test\": BOGUS JSON }", 100);
+
+    // Setup to raise SIGHUP in 200 ms.
+    TimedSignal sighup(*getIOService(), SIGHUP, 200);
+
+    // Write the config and then run launch() for 500 ms
+    // After startup, which will load the initial configuration this enters
+    // the process's runIO() loop. We will first rewrite the config file.
+    // Next we process the SIGHUP signal which should cause us to reconfigure.
+    time_duration elapsed_time;
+    runWithConfig("{ \"string_test\": \"first value\" }", 500, elapsed_time);
+
+    // Verify that we saw the signal.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(1, signals.size());
+    EXPECT_EQ(SIGHUP, signals[0]);
+}
+
+// Tests that the original configuration is retained after a SIGHUP triggered
+// reconfiguration fails due to invalid config content.
+TEST_F(DStubControllerTest, alternateParsing) {
+    controller_->useAlternateParser(true);
+
+    // Setup to raise SIGHUP in 200 ms.
+    TimedSignal sighup(*getIOService(), SIGHUP, 200);
+
+    // Write the config and then run launch() for 500 ms
+    // After startup, which will load the initial configuration this enters
+    // the process's runIO() loop. We will first rewrite the config file.
+    // Next we process the SIGHUP signal which should cause us to reconfigure.
+    time_duration elapsed_time;
+    runWithConfig("{ \"string_test\": \"first value\" }", 500, elapsed_time);
+
+    // Verify that we saw the signal.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(1, signals.size());
+    EXPECT_EQ(SIGHUP, signals[0]);
+}
+
+// Tests that the original configuration is replaced after a SIGHUP triggered
+// reconfiguration succeeds.
+TEST_F(DStubControllerTest, validConfigReload) {
+    // Schedule to rewrite the configuration file after launch. This way the
+    // file is updated after we have done the initial configuration.
+    scheduleTimedWrite("{ \"string_test\": \"second value\" }", 100);
+
+    // Setup to raise SIGHUP in 200 ms and another at 400 ms.
+    TimedSignal sighup(*getIOService(), SIGHUP, 200);
+    TimedSignal sighup2(*getIOService(), SIGHUP, 400);
+
+    // Write the config and then run launch() for 800 ms
+    time_duration elapsed_time;
+    runWithConfig("{ \"string_test\": \"first value\" }", 800, elapsed_time);
+
+    // Verify that we saw two occurrences of the signal.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(2, signals.size());
+    EXPECT_EQ(SIGHUP, signals[0]);
+    EXPECT_EQ(SIGHUP, signals[1]);
+}
+
+// Tests that the SIGINT triggers a normal shutdown.
+TEST_F(DStubControllerTest, sigintShutdown) {
+    // Setup to raise SIGHUP in 1 ms.
+    TimedSignal sighup(*getIOService(), SIGINT, 1);
+
+    // Write the config and then run launch() for 1000 ms
+    time_duration elapsed_time;
+    runWithConfig("{ \"string_test\": \"first value\" }", 1000, elapsed_time);
+
+    // Verify that we saw the signal.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(1, signals.size());
+    EXPECT_EQ(SIGINT, signals[0]);
+
+    // Duration should be significantly less than our max run time.
+    EXPECT_TRUE(elapsed_time.total_milliseconds() < 300);
+}
+
+// Verifies that version and extended version information is correct
+TEST_F(DStubControllerTest, getVersion) {
+    std::string text = controller_->getVersion(false);
+    EXPECT_EQ(text,VERSION);
+
+    text = controller_->getVersion(true);
+    EXPECT_NE(std::string::npos, text.find(VERSION));
+    EXPECT_NE(std::string::npos, text.find(EXTENDED_VERSION));
+    EXPECT_NE(std::string::npos, text.find(controller_->getVersionAddendum()));
+}
+
+// Tests that the SIGTERM triggers a normal shutdown.
+TEST_F(DStubControllerTest, sigtermShutdown) {
+    // Setup to raise SIGHUP in 1 ms.
+    TimedSignal sighup(*getIOService(), SIGTERM, 1);
+
+    // Write the config and then run launch() for 1000 ms
+    time_duration elapsed_time;
+    runWithConfig("{ \"string_test\": \"first value\" }", 1000, elapsed_time);
+
+    // Verify that we saw the signal.
+    std::vector<int>& signals = controller_->getProcessedSignals();
+    ASSERT_EQ(1, signals.size());
+    EXPECT_EQ(SIGTERM, signals[0]);
+
+    // Duration should be significantly less than our max run time.
+    EXPECT_TRUE(elapsed_time.total_milliseconds() < 300);
+}
+
+}; // end of isc::process namespace
+}; // end of isc namespace
diff --git a/src/lib/process/tests/daemon_unittest.cc b/src/lib/process/tests/daemon_unittest.cc
new file mode 100644
index 0000000..bd80e25
--- /dev/null
+++ b/src/lib/process/tests/daemon_unittest.cc
@@ -0,0 +1,324 @@
+// Copyright (C) 2014-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <cc/data.h>
+#include <process/daemon.h>
+#include <process/config_base.h>
+#include <process/log_parser.h>
+#include <log/logger_support.h>
+
+#include <gtest/gtest.h>
+
+#include <sys/wait.h>
+
+using namespace isc;
+using namespace isc::process;
+using namespace isc::data;
+
+namespace isc {
+namespace process {
+
+// @brief Derived Daemon class
+class DaemonImpl : public Daemon {
+public:
+    static std::string getVersion(bool extended);
+
+    using Daemon::makePIDFileName;
+};
+
+std::string DaemonImpl::getVersion(bool extended) {
+    if (extended) {
+        return (std::string("EXTENDED"));
+    } else {
+        return (std::string("BASIC"));
+    }
+}
+
+};
+};
+
+namespace {
+
+/// @brief Daemon Test test fixture class
+class DaemonTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    DaemonTest() : env_copy_() {
+        // Take a copy of KEA_PIDFILE_DIR environment variable value
+        char *env_value = getenv("KEA_PIDFILE_DIR");
+        if (env_value) {
+            env_copy_ = std::string(env_value);
+        }
+    }
+
+    /// @brief Destructor
+    ///
+    /// As some of the tests have the side-effect of altering the logging
+    /// settings (when configureLogger is called), the logging is reset to
+    /// the default after each test completes.
+    ~DaemonTest() {
+        isc::log::setDefaultLoggingOutput();
+        // Restore KEA_PIDFILE_DIR environment variable value
+        if (env_copy_.empty()) {
+            static_cast<void>(unsetenv("KEA_PIDFILE_DIR"));
+        } else {
+            static_cast<void>(setenv("KEA_PIDFILE_DIR", env_copy_.c_str(), 1));
+        }
+    }
+
+private:
+    /// @brief copy of KEA_PIDFILE_DIR environment variable value
+    std::string env_copy_;
+};
+
+
+// Very simple test. Checks whether Daemon can be instantiated and its
+// default parameters are sane
+TEST_F(DaemonTest, constructor) {
+    // Disable KEA_PIDFILE_DIR
+    EXPECT_EQ(0, unsetenv("KEA_PIDFILE_DIR"));
+
+    EXPECT_NO_THROW(Daemon instance1);
+
+    // Check only instance values.
+    Daemon instance2;
+    EXPECT_TRUE(instance2.getConfigFile().empty());
+    EXPECT_EQ(std::string(DATA_DIR), instance2.getPIDFileDir());
+    EXPECT_TRUE(instance2.getPIDFileName().empty());
+}
+
+// Verify config file accessors
+TEST_F(DaemonTest, getSetConfigFile) {
+    Daemon instance;
+
+    EXPECT_NO_THROW(instance.setConfigFile("test.txt"));
+    EXPECT_EQ("test.txt", instance.getConfigFile());
+    EXPECT_NO_THROW(instance.checkConfigFile());
+}
+
+// Verify config file checker.
+TEST_F(DaemonTest, checkConfigFile) {
+    Daemon instance;
+
+    EXPECT_THROW(instance.checkConfigFile(), BadValue);
+    EXPECT_NO_THROW(instance.setConfigFile("/tmp/"));
+    EXPECT_THROW(instance.checkConfigFile(), BadValue);
+    EXPECT_NO_THROW(instance.setConfigFile("/tmp/test.txt"));
+    EXPECT_NO_THROW(instance.checkConfigFile());
+}
+
+// Verify process name accessors
+TEST_F(DaemonTest, getSetProcName) {
+    Daemon instance;
+
+    EXPECT_NO_THROW(instance.setProcName("myproc"));
+    EXPECT_EQ("myproc", instance.getProcName());
+}
+
+// Verify PID file directory name accessors
+TEST_F(DaemonTest, getSetPIDFileDir) {
+    Daemon instance;
+
+    EXPECT_NO_THROW(instance.setPIDFileDir("/tmp"));
+    EXPECT_EQ("/tmp", instance.getPIDFileDir());
+}
+
+// Verify PID file name accessors.
+TEST_F(DaemonTest, setPIDFileName) {
+    Daemon instance;
+
+    // Verify that PID file name may not be set to empty
+    EXPECT_THROW(instance.setPIDFileName(""), BadValue);
+
+    EXPECT_NO_THROW(instance.setPIDFileName("myproc"));
+    EXPECT_EQ("myproc", instance.getPIDFileName());
+
+    // Verify that setPIDFileName cannot be called twice on the same instance.
+    EXPECT_THROW(instance.setPIDFileName("again"), InvalidOperation);
+}
+
+// Test the getVersion() redefinition
+TEST_F(DaemonTest, getVersion) {
+    EXPECT_THROW(Daemon::getVersion(false), NotImplemented);
+
+    ASSERT_NO_THROW(DaemonImpl::getVersion(false));
+
+    EXPECT_EQ(DaemonImpl::getVersion(false), "BASIC");
+
+    ASSERT_NO_THROW(DaemonImpl::getVersion(true));
+
+    EXPECT_EQ(DaemonImpl::getVersion(true), "EXTENDED");
+}
+
+// Verify makePIDFileName method
+TEST_F(DaemonTest, makePIDFileName) {
+    DaemonImpl instance;
+
+    // Verify that config file cannot be blank
+    instance.setProcName("notblank");
+    EXPECT_THROW(instance.makePIDFileName(), InvalidOperation);
+
+    // Verify that proc name cannot be blank
+    instance.setProcName("");
+    instance.setConfigFile("notblank");
+    EXPECT_THROW(instance.makePIDFileName(), InvalidOperation);
+
+    // Verify that config file must contain a file name
+    instance.setProcName("myproc");
+    instance.setConfigFile(".txt");
+    EXPECT_THROW(instance.makePIDFileName(), BadValue);
+    instance.setConfigFile("/tmp/");
+    EXPECT_THROW(instance.makePIDFileName(), BadValue);
+
+    // Given a valid config file name and proc name we should good to go
+    instance.setConfigFile("/tmp/test.conf");
+    std::string name;
+    EXPECT_NO_THROW(name = instance.makePIDFileName());
+
+    // Make sure the name is as we expect
+    std::ostringstream stream;
+    stream  << instance.getPIDFileDir() << "/test.myproc.pid";
+    EXPECT_EQ(stream.str(), name);
+
+    // Verify that the default directory can be overridden
+    instance.setPIDFileDir("/tmp");
+    EXPECT_NO_THROW(name = instance.makePIDFileName());
+    EXPECT_EQ("/tmp/test.myproc.pid", name);
+}
+
+// Verifies the creation a PID file and that a pre-existing PID file
+// which points to a live PID causes a throw.
+TEST_F(DaemonTest, createPIDFile) {
+    DaemonImpl instance;
+
+    instance.setConfigFile("test.conf");
+    instance.setProcName("daemon_test");
+    instance.setPIDFileDir(TEST_DATA_BUILDDIR);
+
+    EXPECT_NO_THROW(instance.createPIDFile());
+
+    std::ostringstream stream;
+    stream  << TEST_DATA_BUILDDIR << "/test.daemon_test.pid";
+    EXPECT_EQ(stream.str(), instance.getPIDFileName());
+
+    // If we try again, we should see our own PID file and fail
+    EXPECT_THROW(instance.createPIDFile(), DaemonPIDExists);
+}
+
+// Verifies that a pre-existing PID file which points to a dead PID
+// is overwritten.
+TEST_F(DaemonTest, createPIDFileOverwrite) {
+    DaemonImpl instance;
+
+    // We're going to use fork to generate a PID we KNOW is dead.
+    int pid = fork();
+    ASSERT_GE(pid, 0);
+
+    if (pid == 0) {
+        // This is the child, die right away. Tragic, no?
+        _exit (0);
+    }
+
+    // Back in the parent test, we need to wait for the child to die
+    // As with debugging waitpid() can be interrupted ignore EINTR.
+    int stat;
+    int ret;
+    do {
+        ret = waitpid(pid, &stat, 0);
+    } while ((ret == -1) && (errno == EINTR));
+    ASSERT_EQ(ret, pid);
+
+    // Ok, so we should now have a PID that we know to be dead.
+    // Let's use it to create a PID file.
+    instance.setConfigFile("test.conf");
+    instance.setProcName("daemon_test");
+    instance.setPIDFileDir(TEST_DATA_BUILDDIR);
+    EXPECT_NO_THROW(instance.createPIDFile(pid));
+
+    // If we try to create the PID file again, this should work.
+    EXPECT_NO_THROW(instance.createPIDFile());
+}
+
+// Verifies that Daemon destruction deletes the PID file
+TEST_F(DaemonTest, PIDFileCleanup) {
+    boost::shared_ptr<DaemonImpl> instance;
+    instance.reset(new DaemonImpl);
+
+    instance->setConfigFile("test.conf");
+    instance->setProcName("daemon_test");
+    instance->setPIDFileDir(TEST_DATA_BUILDDIR);
+    EXPECT_NO_THROW(instance->createPIDFile());
+
+    // If we try again, we should see our own PID file
+    EXPECT_THROW(instance->createPIDFile(), DaemonPIDExists);
+
+    // Save the pid file name
+    std::string pid_file_name = instance->getPIDFileName();
+
+    // Now delete the Daemon instance.  This should remove the
+    // PID file.
+    instance.reset();
+
+    struct stat stat_buf;
+    ASSERT_EQ(-1, stat(pid_file_name.c_str(), &stat_buf));
+    EXPECT_EQ(errno, ENOENT);
+}
+
+// Checks that configureLogger method is behaving properly.
+// More dedicated tests are available for LogConfigParser class.
+// See logger_unittest.cc
+TEST_F(DaemonTest, parsingConsoleOutput) {
+    Daemon::setVerbose(false);
+
+    // Storage - parsed configuration will be stored here
+    ConfigPtr storage(new ConfigBase());
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"stdout\""
+    "            }"
+    "        ],"
+    "        \"debuglevel\": 99,"
+    "        \"severity\": \"DEBUG\""
+    "    }"
+    "]}";
+    ConstElementPtr config = Element::fromJSON(config_txt);
+
+    // Spawn a daemon and tell it to configure logger
+    Daemon x;
+    EXPECT_NO_THROW(x.configureLogger(config, storage));
+
+    // The parsed configuration should be processed by the daemon and
+    // stored in configuration storage.
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(99, storage->getLoggingInfo()[0].debuglevel_);
+    EXPECT_EQ(isc::log::DEBUG, storage->getLoggingInfo()[0].severity_);
+
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("stdout" , storage->getLoggingInfo()[0].destinations_[0].output_);
+}
+
+TEST_F(DaemonTest, exitValue) {
+    DaemonImpl instance;
+
+    EXPECT_EQ(EXIT_SUCCESS, instance.getExitValue());
+    instance.setExitValue(77);
+    EXPECT_EQ(77, instance.getExitValue());
+}
+
+
+// More tests will appear here as we develop Daemon class.
+
+};
diff --git a/src/lib/process/tests/log_parser_unittests.cc b/src/lib/process/tests/log_parser_unittests.cc
new file mode 100644
index 0000000..0341dd7
--- /dev/null
+++ b/src/lib/process/tests/log_parser_unittests.cc
@@ -0,0 +1,530 @@
+// Copyright (C) 2014-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <cc/data.h>
+#include <process/log_parser.h>
+#include <process/process_messages.h>
+#include <exceptions/exceptions.h>
+#include <log/logger_support.h>
+#include <process/d_log.h>
+#include <testutils/gtest_utils.h>
+#include <testutils/io_utils.h>
+
+#include <gtest/gtest.h>
+
+using namespace isc;
+using namespace isc::process;
+using namespace isc::data;
+
+namespace {
+
+/// @brief Logging Test Fixture Class
+///
+/// Trivial class that ensures that the logging is reset to its defaults after
+/// each test.  Strictly speaking this only resets the testing root logger (which
+/// has the name "kea") but as the only other logger mentioned here ("wombat")
+/// is not used elsewhere, that is sufficient.
+class LoggingTest : public ::testing::Test {
+    public:
+        /// @brief Constructor
+        LoggingTest() {}
+
+        /// @brief Destructor
+        ///
+        /// Reset root logger back to defaults.
+        ~LoggingTest() {
+            isc::log::initLogger();
+            wipeFiles();
+        }
+
+    /// @brief Generates a log file name suffixed with a rotation number
+    /// @param rotation number to the append to the end of the file
+    std::string logName(int rotation) {
+        std::ostringstream os;
+        os << TEST_LOG_NAME << "." << rotation;
+        return (os.str());
+    }
+
+    /// @brief Removes the base log file name and 1 rotation
+    void wipeFiles()  {
+        static_cast<void>(remove(TEST_LOG_NAME));
+        for (int i = 1; i < TEST_MAX_VERS + 1; ++i) {
+            static_cast<void>(remove(logName(i).c_str()));
+        }
+
+        // Remove the lock file
+        std::ostringstream os;
+        os << TEST_LOG_NAME << ".lock";
+        static_cast<void>(remove(os.str().c_str()));
+    }
+
+    /// @brief Name of the log file
+    static const char* TEST_LOG_NAME;
+
+    /// @brief Maximum log size
+    static const int TEST_MAX_SIZE;
+
+    /// @brief Maximum rotated log versions
+    static const int TEST_MAX_VERS;
+
+};
+
+const char* LoggingTest::TEST_LOG_NAME = "kea.test.log";
+const int LoggingTest::TEST_MAX_SIZE = 204800;  // Smallest without disabling rotation
+const int LoggingTest::TEST_MAX_VERS = 2;       // More than the default of 1
+
+// Checks that the constructor is able to process specified storage properly.
+TEST_F(LoggingTest, constructor) {
+
+    ConfigPtr null_ptr;
+    EXPECT_THROW(LogConfigParser parser(null_ptr), BadValue);
+
+    ConfigPtr nonnull(new ConfigBase());
+
+    EXPECT_NO_THROW(LogConfigParser parser(nonnull));
+}
+
+// Checks if the LogConfigParser class is able to transform JSON structures
+// into Configuration usable by log4cplus. This test checks for output
+// configured to stdout on debug level.
+TEST_F(LoggingTest, parsingConsoleOutput) {
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"stdout\","
+    "                \"flush\": true"
+    "            }"
+    "        ],"
+    "        \"debuglevel\": 99,"
+    "        \"severity\": \"DEBUG\""
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(99, storage->getLoggingInfo()[0].debuglevel_);
+    EXPECT_EQ(isc::log::DEBUG, storage->getLoggingInfo()[0].severity_);
+
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("stdout" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].flush_);
+}
+
+// Check that LogConfigParser can parse configuration that
+// lacks a severity entry.
+TEST_F(LoggingTest, parsingNoSeverity) {
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"stdout\","
+    "                \"flush\": true"
+    "            }"
+    "        ],"
+    "        \"debuglevel\": 99"
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    // No exception should be thrown.
+    EXPECT_NO_THROW_LOG(parser.parseConfiguration(config));
+
+    // Entries should be the ones set.
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+    LoggingInfo const& logging_info(storage->getLoggingInfo()[0]);
+    EXPECT_EQ("kea", logging_info.name_);
+    EXPECT_EQ(99, logging_info.debuglevel_);
+    ASSERT_EQ(1, logging_info.destinations_.size());
+    EXPECT_EQ("stdout" , logging_info.destinations_[0].output_);
+    EXPECT_TRUE(logging_info.destinations_[0].flush_);
+
+    // Severity should default to DEFAULT.
+    EXPECT_EQ(isc::log::DEFAULT, logging_info.severity_);
+
+    // Pattern should default to empty string.
+    EXPECT_TRUE(logging_info.destinations_[0].pattern_.empty());
+}
+
+// Checks if the LogConfigParser class is able to transform JSON structures
+// into Configuration usable by log4cplus. This test checks for output
+// configured to a file on INFO level.
+TEST_F(LoggingTest, parsingFile) {
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"logfile.txt\""
+    "            }"
+    "        ],"
+    "        \"severity\": \"INFO\""
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(0, storage->getLoggingInfo()[0].debuglevel_);
+    EXPECT_EQ(isc::log::INFO, storage->getLoggingInfo()[0].severity_);
+
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("logfile.txt" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    // Default for immediate flush is true
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].flush_);
+
+    // Pattern should default to empty string.
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].pattern_.empty());
+}
+
+// Checks if the LogConfigParser class is able to transform data structures
+// into Configuration usable by log4cplus. This test checks that more than
+// one logger can be configured.
+TEST_F(LoggingTest, multipleLoggers) {
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"logfile.txt\","
+    "                \"flush\": true"
+    "            }"
+    "        ],"
+    "        \"severity\": \"INFO\""
+    "    },"
+    "    {"
+    "        \"name\": \"wombat\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"logfile2.txt\","
+    "                \"flush\": false"
+    "            }"
+    "        ],"
+    "        \"severity\": \"DEBUG\","
+    "        \"debuglevel\": 99"
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(2, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(0, storage->getLoggingInfo()[0].debuglevel_);
+    EXPECT_EQ(isc::log::INFO, storage->getLoggingInfo()[0].severity_);
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("logfile.txt" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].flush_);
+
+    EXPECT_EQ("wombat", storage->getLoggingInfo()[1].name_);
+    EXPECT_EQ(99, storage->getLoggingInfo()[1].debuglevel_);
+    EXPECT_EQ(isc::log::DEBUG, storage->getLoggingInfo()[1].severity_);
+    ASSERT_EQ(1, storage->getLoggingInfo()[1].destinations_.size());
+    EXPECT_EQ("logfile2.txt" , storage->getLoggingInfo()[1].destinations_[0].output_);
+    EXPECT_FALSE(storage->getLoggingInfo()[1].destinations_[0].flush_);
+}
+
+// Checks if the LogConfigParser class is able to transform data structures
+// into Configuration usable by log4cplus. This test checks that more than
+// one logging destination can be configured.
+TEST_F(LoggingTest, multipleLoggingDestinations) {
+
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"logfile.txt\""
+    "            },"
+    "            {"
+    "                \"output\": \"stdout\""
+    "            }"
+    "        ],"
+    "        \"severity\": \"INFO\""
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(0, storage->getLoggingInfo()[0].debuglevel_);
+    EXPECT_EQ(isc::log::INFO, storage->getLoggingInfo()[0].severity_);
+    ASSERT_EQ(2, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("logfile.txt" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].flush_);
+    EXPECT_EQ("stdout" , storage->getLoggingInfo()[0].destinations_[1].output_);
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[1].flush_);
+}
+
+// Verifies that log rotation occurs when configured.  We do not
+// worry about contents of the log files, only that rotation occurs.
+// Such details are tested in lib/log.  This test verifies that
+// we can correctly configure logging such that rotation occurs as
+// expected.
+TEST_F(LoggingTest, logRotate) {
+    wipeFiles();
+
+    std::ostringstream os;
+    os <<
+        "{ \"loggers\": ["
+        "    {"
+        "        \"name\": \"kea\","
+        "        \"output_options\": ["
+        "            {"
+        "                \"output\": \""
+        << TEST_LOG_NAME << "\","  <<
+        "                \"flush\": true,"
+        "                \"maxsize\":"
+        << TEST_MAX_SIZE << "," <<
+        "                \"maxver\":"
+        << TEST_MAX_VERS <<
+        "            }"
+        "        ],"
+        "        \"debuglevel\": 99,"
+        "        \"severity\": \"DEBUG\""
+        "    }"
+        "]}";
+
+    // Create our server config container.
+    ConfigPtr server_cfg(new ConfigBase());
+
+    // LogConfigParser expects a list of loggers, so parse
+    // the JSON text and extract the "loggers" element from it
+    ConstElementPtr config = Element::fromJSON(os.str());
+    config = config->get("loggers");
+
+    // Parse the config and then apply it.
+    LogConfigParser parser(server_cfg);
+    ASSERT_NO_THROW(parser.parseConfiguration(config));
+    ASSERT_NO_THROW(server_cfg->applyLoggingCfg());
+
+    EXPECT_EQ(TEST_MAX_SIZE, server_cfg->getLoggingInfo()[0].destinations_[0].maxsize_);
+    EXPECT_EQ(TEST_MAX_VERS, server_cfg->getLoggingInfo()[0].destinations_[0].maxver_);
+
+    // Make sure we have the initial log file.
+    ASSERT_TRUE(isc::test::fileExists(TEST_LOG_NAME));
+
+    // Now generate a log we know will be large enough to force a rotation.
+    // We borrow a one argument log message for the test.
+    std::string big_arg(TEST_MAX_SIZE, 'x');
+    isc::log::Logger logger("kea");
+
+    for (int i = 1; i < TEST_MAX_VERS + 1; i++) {
+        // Output the big log and make sure we get the expected rotation file.
+        LOG_INFO(logger, DCTL_CONFIG_COMPLETE).arg(big_arg);
+        EXPECT_TRUE(isc::test::fileExists(logName(i).c_str()));
+    }
+
+    // Clean up.
+    wipeFiles();
+}
+
+// Verifies that a valid output option,'pattern' parses correctly.
+TEST_F(LoggingTest, validPattern) {
+
+    // Note the backslash must be doubled in the pattern definition.
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"stdout\","
+    "                \"pattern\": \"mylog %m\\n\""
+    "            }"
+    "        ],"
+    "        \"severity\": \"INFO\""
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(isc::log::INFO, storage->getLoggingInfo()[0].severity_);
+
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("stdout" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    EXPECT_EQ(storage->getLoggingInfo()[0].destinations_[0].pattern_,
+              std::string("mylog %m\n"));
+}
+
+// Verifies that output option,'pattern', may be an empty string
+TEST_F(LoggingTest, emptyPattern) {
+    const char* config_txt =
+    "{ \"loggers\": ["
+    "    {"
+    "        \"name\": \"kea\","
+    "        \"output_options\": ["
+    "            {"
+    "                \"output\": \"stdout\","
+    "                \"pattern\": \"\""
+    "            }"
+    "        ],"
+    "        \"severity\": \"INFO\""
+    "    }"
+    "]}";
+
+    ConfigPtr storage(new ConfigBase());
+
+    LogConfigParser parser(storage);
+
+    // We need to parse properly formed JSON and then extract
+    // "loggers" element from it. For some reason fromJSON is
+    // throwing at opening square bracket
+    ConstElementPtr config = Element::fromJSON(config_txt);
+    config = config->get("loggers");
+
+    EXPECT_NO_THROW(parser.parseConfiguration(config));
+
+    ASSERT_EQ(1, storage->getLoggingInfo().size());
+
+    EXPECT_EQ("kea", storage->getLoggingInfo()[0].name_);
+    EXPECT_EQ(isc::log::INFO, storage->getLoggingInfo()[0].severity_);
+
+    ASSERT_EQ(1, storage->getLoggingInfo()[0].destinations_.size());
+    EXPECT_EQ("stdout" , storage->getLoggingInfo()[0].destinations_[0].output_);
+    EXPECT_TRUE(storage->getLoggingInfo()[0].destinations_[0].pattern_.empty());
+}
+
+void testMaxSize(uint64_t maxsize_candidate, uint64_t expected_maxsize) {
+    std::string const logger(R"(
+    {
+      "loggers": [
+        {
+
+          "debuglevel": 99,
+          "name": "kea",
+          "output_options": [
+            {
+              "output": "kea.test.log",
+              "flush": true,
+              "maxsize": )" + std::to_string(maxsize_candidate) + R"(,
+              "maxver": 2
+            }
+          ],
+          "severity": "DEBUG"
+        }
+      ]
+    }
+    )");
+
+    // Create our server config container.
+    ConfigPtr server_cfg(boost::make_shared<ConfigBase>());
+
+    // LogConfigParser expects a list of loggers, so parse
+    // the JSON text and extract the "loggers" element from it
+    ConstElementPtr config(Element::fromJSON(logger));
+    config = config->get("loggers");
+
+    // Parse the config and then apply it.
+    LogConfigParser parser(server_cfg);
+    ASSERT_NO_THROW(parser.parseConfiguration(config));
+    ASSERT_NO_THROW(server_cfg->applyLoggingCfg());
+
+    EXPECT_EQ(server_cfg->getLoggingInfo()[0].destinations_[0].maxsize_,
+              expected_maxsize);
+}
+
+// Test that maxsize can be configured with high values.
+TEST_F(LoggingTest, maxsize) {
+    testMaxSize(TEST_MAX_SIZE, TEST_MAX_SIZE);
+    testMaxSize(std::numeric_limits<int32_t>::max(), std::numeric_limits<int32_t>::max());
+    testMaxSize(std::numeric_limits<uint32_t>::max(), std::numeric_limits<uint32_t>::max());
+    testMaxSize(1000LL * std::numeric_limits<int32_t>::max(), 1000LL * std::numeric_limits<int32_t>::max());
+    testMaxSize(1000000LL * std::numeric_limits<int32_t>::max(), 1000000LL * std::numeric_limits<int32_t>::max());
+}
+
+/// @todo Add tests for malformed logging configuration
+
+/// @todo There is no easy way to test applyConfiguration() and defaultLogging().
+/// To test them, it would require instrumenting log4cplus to actually fake
+/// the logging set up. Alternatively, we could develop set of test suites
+/// that check each logging destination separately (e.g. configure log file, then
+/// check if the file is indeed created or configure stdout destination, then
+/// swap console file descriptors and check that messages are really logged.
+
+}  // namespace
diff --git a/src/lib/process/tests/logging_info_unittests.cc b/src/lib/process/tests/logging_info_unittests.cc
new file mode 100644
index 0000000..388a8a5
--- /dev/null
+++ b/src/lib/process/tests/logging_info_unittests.cc
@@ -0,0 +1,208 @@
+// Copyright (C) 2014-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <process/daemon.h>
+#include <process/logging_info.h>
+#include <testutils/test_to_element.h>
+#include <gtest/gtest.h>
+
+using namespace isc::process;
+using namespace isc::test;
+using namespace isc::data;
+
+namespace {
+
+// Checks if two destinations can be compared for equality.
+TEST(LoggingDestination, equals) {
+    LoggingDestination dest1;
+    LoggingDestination dest2;
+
+    EXPECT_TRUE(dest1.equals(dest2));
+
+    dest1.output_ = "stderr";
+    EXPECT_FALSE(dest1.equals(dest2));
+
+    dest2.output_ = "stdout";
+    EXPECT_FALSE(dest1.equals(dest2));
+
+    dest2.output_ = "stderr";
+    EXPECT_TRUE(dest1.equals(dest2));
+
+    dest1.maxver_ = 10;
+    dest2.maxver_ = 5;
+    EXPECT_FALSE(dest1.equals(dest2));
+
+    dest2.maxver_ = 10;
+    EXPECT_TRUE(dest1.equals(dest2));
+
+    dest1.maxsize_ = 64;
+    dest2.maxsize_ = 32;
+    EXPECT_FALSE(dest1.equals(dest2));
+
+    dest1.maxsize_ = 32;
+    EXPECT_TRUE(dest1.equals(dest2));
+}
+
+/// @brief Test fixture class for testing @c LoggingInfo.
+class LoggingInfoTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    LoggingInfoTest() = default;
+
+    /// @brief Destructor
+    virtual ~LoggingInfoTest() = default;
+
+    /// @brief Setup the test.
+    virtual void SetUp() {
+        Daemon::setVerbose(false);
+    }
+
+    /// @brief Clear after the test.
+    virtual void TearDown() {
+        Daemon::setVerbose(false);
+    }
+};
+
+// Checks if default logging configuration is correct.
+TEST_F(LoggingInfoTest, defaults) {
+
+    // We now need to set the default logger explicitly.
+    // Otherwise leftovers from previous tests that use DController
+    // would leave the default logger set to TestBin.
+    Daemon::setDefaultLoggerName("kea");
+
+    LoggingInfo info_non_verbose;
+
+    // The DStubTest framework sets up the default binary name to TestBin
+    EXPECT_EQ("kea", info_non_verbose.name_);
+    EXPECT_EQ(isc::log::INFO, info_non_verbose.severity_);
+    EXPECT_EQ(0, info_non_verbose.debuglevel_);
+
+    ASSERT_EQ(1, info_non_verbose.destinations_.size());
+    EXPECT_EQ("stdout", info_non_verbose.destinations_[0].output_);
+
+    std::string header = "{\n";
+    std::string begin =
+        "\"name\": \"kea\",\n"
+        "\"output_options\": [ {\n"
+        " \"output\": \"stdout\", \"flush\": true, \"pattern\": \"\" } ],\n"
+        "\"severity\": \"";
+    std::string dbglvl = "\",\n\"debuglevel\": ";
+    std::string trailer = "\n}\n";
+    std::string expected = header + begin + "INFO" + dbglvl + "0" + trailer;
+    runToElementTest<LoggingInfo>(expected, info_non_verbose);
+
+    // Add a user context
+    std::string comment = "\"comment\": \"foo\"";
+    std::string user_context = "{ " + comment + " }";
+    std::string user_context_nl = "{\n" + comment + "\n}";
+    EXPECT_FALSE(info_non_verbose.getContext());
+    info_non_verbose.setContext(Element::fromJSON(user_context));
+    ASSERT_TRUE(info_non_verbose.getContext());
+    EXPECT_EQ(user_context, info_non_verbose.getContext()->str());
+    expected = header;
+    expected += "\"user-context\": " + user_context_nl + ",\n";
+    expected += begin + "INFO" + dbglvl + "0" + trailer;
+    runToElementTest<LoggingInfo>(expected, info_non_verbose);
+
+    Daemon::setVerbose(true);
+    LoggingInfo info_verbose;
+    EXPECT_EQ("kea", info_verbose.name_);
+    EXPECT_EQ(isc::log::DEBUG, info_verbose.severity_);
+    EXPECT_EQ(99, info_verbose.debuglevel_);
+
+    ASSERT_EQ(1, info_verbose.destinations_.size());
+    EXPECT_EQ("stdout", info_verbose.destinations_[0].output_);
+
+    EXPECT_EQ(10240000, info_verbose.destinations_[0].maxsize_);
+    EXPECT_EQ(1, info_verbose.destinations_[0].maxver_);
+
+    expected = header + begin + "DEBUG" + dbglvl + "99" + trailer;
+    runToElementTest<LoggingInfo>(expected, info_verbose);
+
+    // User comment again
+    EXPECT_FALSE(info_verbose.getContext());
+    info_verbose.setContext(Element::fromJSON(user_context));
+    ASSERT_TRUE(info_verbose.getContext());
+    EXPECT_EQ(user_context, info_verbose.getContext()->str());
+    expected = header;
+    expected += "\"user-context\": " + user_context_nl + ",\n";
+    expected += begin + "DEBUG" + dbglvl + "99" + trailer;
+    runToElementTest<LoggingInfo>(expected, info_verbose);
+}
+
+// Checks if (in)equality operators work for LoggingInfo.
+TEST_F(LoggingInfoTest, equalityOperators) {
+    LoggingInfo info1;
+    LoggingInfo info2;
+
+    // Initially, both objects are the same.
+    EXPECT_TRUE(info1 == info2);
+
+    // Differ by name.
+    info1.name_ = "foo";
+    info2.name_ = "bar";
+    EXPECT_FALSE(info1 == info2);
+    EXPECT_TRUE(info1 != info2);
+
+    // Names equal.
+    info2.name_ = "foo";
+    EXPECT_TRUE(info1 == info2);
+    EXPECT_FALSE(info1 != info2);
+
+    // Differ by severity.
+    info1.severity_ = isc::log::DEBUG;
+    info2.severity_ = isc::log::INFO;
+    EXPECT_FALSE(info1 == info2);
+    EXPECT_TRUE(info1 != info2);
+
+    // Severities equal.
+    info2.severity_ = isc::log::DEBUG;
+    EXPECT_TRUE(info1 == info2);
+    EXPECT_FALSE(info1 != info2);
+
+    // Differ by debug level.
+    info1.debuglevel_ = 99;
+    info2.debuglevel_ = 1;
+    EXPECT_FALSE(info1 == info2);
+    EXPECT_TRUE(info1 != info2);
+
+    // Debug level equal.
+    info2.debuglevel_ = 99;
+    EXPECT_TRUE(info1 == info2);
+    EXPECT_FALSE(info1 != info2);
+
+    // Create two different destinations.
+    LoggingDestination dest1;
+    LoggingDestination dest2;
+    dest1.output_ = "foo";
+    dest2.output_ = "bar";
+
+    // Push destinations in some order to info1.
+    info1.destinations_.push_back(dest1);
+    info1.destinations_.push_back(dest2);
+
+    // Push in reverse order to info2. Order shouldn't matter.
+    info2.destinations_.push_back(dest2);
+    info2.destinations_.push_back(dest1);
+
+    EXPECT_TRUE(info1 == info2);
+    EXPECT_FALSE(info1 != info2);
+
+    // Change one of the destinations.
+    LoggingDestination dest3;
+    dest3.output_ = "foobar";
+
+    info2.destinations_[2] = dest3;
+
+    // The should now be unequal.
+    EXPECT_FALSE(info1 == info2);
+    EXPECT_TRUE(info1 != info2);
+}
+
+} // end of anonymous namespace
diff --git a/src/lib/process/tests/run_unittests.cc b/src/lib/process/tests/run_unittests.cc
new file mode 100644
index 0000000..a7c1f68
--- /dev/null
+++ b/src/lib/process/tests/run_unittests.cc
@@ -0,0 +1,24 @@
+// Copyright (C) 2016 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <log/logger_support.h>
+#include <process/d_log.h>
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+    isc::log::initLogger();
+
+    // Override --localstatedir value for PID files
+    setenv("KEA_PIDFILE_DIR", TEST_DATA_BUILDDIR, 1);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/process/testutils/Makefile.am b/src/lib/process/testutils/Makefile.am
new file mode 100644
index 0000000..147957e
--- /dev/null
+++ b/src/lib/process/testutils/Makefile.am
@@ -0,0 +1,27 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += -DDATABASE_SCRIPTS_DIR=\"$(abs_top_srcdir)/src/share/database/scripts\"
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+CLEANFILES = *.gcno *.gcda
+
+if HAVE_GTEST
+
+noinst_LTLIBRARIES = libprocesstest.la
+
+libprocesstest_la_SOURCES  = d_test_stubs.cc d_test_stubs.h
+
+libprocesstest_la_CXXFLAGS = $(AM_CXXFLAGS)
+libprocesstest_la_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+libprocesstest_la_LDFLAGS  = $(AM_LDFLAGS)
+
+libprocesstest_la_LIBADD  = $(top_builddir)/src/lib/process/libkea-process.la
+libprocesstest_la_LIBADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libprocesstest_la_LIBADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libprocesstest_la_LIBADD += $(top_builddir)/src/lib/log/libkea-log.la
+libprocesstest_la_LIBADD += $(LOG4CPLUS_LIBS) $(BOOST_LIBS)
+
+endif
diff --git a/src/lib/process/testutils/Makefile.in b/src/lib/process/testutils/Makefile.in
new file mode 100644
index 0000000..bca5d20
--- /dev/null
+++ b/src/lib/process/testutils/Makefile.in
@@ -0,0 +1,870 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
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diff --git a/src/lib/process/testutils/d_test_stubs.cc b/src/lib/process/testutils/d_test_stubs.cc
new file mode 100644
index 0000000..6500855
--- /dev/null
+++ b/src/lib/process/testutils/d_test_stubs.cc
@@ -0,0 +1,338 @@
+// Copyright (C) 2013-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+#include <asiolink/io_service.h>
+#include <process/d_log.h>
+#include <process/testutils/d_test_stubs.h>
+#include <process/daemon.h>
+#include <cc/command_interpreter.h>
+#include <functional>
+
+using namespace boost::asio;
+
+namespace isc {
+namespace process {
+
+// Initialize the static failure flag.
+SimFailure::FailureType SimFailure::failure_type_ = SimFailure::ftNoFailure;
+
+DStubProcess::DStubProcess(const char* name, asiolink::IOServicePtr io_service)
+    : DProcessBase(name, io_service, DCfgMgrBasePtr(new DStubCfgMgr())) {
+};
+
+
+void
+DStubProcess::init() {
+    if (SimFailure::shouldFailOn(SimFailure::ftProcessInit)) {
+        // Simulates a failure to instantiate the process.
+        isc_throw(DProcessBaseError, "DStubProcess simulated init() failure");
+    }
+};
+
+void
+DStubProcess::run() {
+    // Until shut down or an fatal error occurs, wait for and
+    // execute a single callback. This is a preliminary implementation
+    // that is likely to evolve as development progresses.
+    // To use run(), the "managing" layer must issue an io_service::stop
+    // or the call to run will continue to block, and shutdown will not
+    // occur.
+    asiolink::IOServicePtr& io_service = getIoService();
+    while (!shouldShutdown()) {
+        try {
+            io_service->run_one();
+        } catch (const std::exception& ex) {
+            isc_throw (DProcessBaseError,
+                std::string("Process run method failed: ") + ex.what());
+        }
+    }
+};
+
+isc::data::ConstElementPtr
+DStubProcess::shutdown(isc::data::ConstElementPtr /* args */) {
+    if (SimFailure::shouldFailOn(SimFailure::ftProcessShutdown)) {
+        // Simulates a failure during shutdown process.
+        isc_throw(DProcessBaseError, "DStubProcess simulated shutdown failure");
+    }
+
+    setShutdownFlag(true);
+    stopIOService();
+    return (isc::config::createAnswer(isc::config::CONTROL_RESULT_SUCCESS,
+                                      "Shutdown initiated."));
+}
+
+isc::data::ConstElementPtr
+DStubProcess::configure(isc::data::ConstElementPtr config_set, bool check_only) {
+    if (SimFailure::shouldFailOn(SimFailure::ftProcessConfigure)) {
+        // Simulates a process configure failure.
+        return (isc::config::createAnswer(isc::config::CONTROL_RESULT_ERROR,
+                                          "Simulated process configuration error."));
+    }
+
+    return (getCfgMgr()->simpleParseConfig(config_set, check_only));
+}
+
+DStubProcess::~DStubProcess() {
+    Daemon::setVerbose(false);
+};
+
+//************************** DStubController *************************
+
+// Define custom command line option command supported by DStubController.
+const char* DStubController::stub_option_x_ = "x";
+
+/// @brief Defines the app name used to construct the controller
+const char* DStubController::stub_app_name_ = "TestService";
+
+/// @brief Defines the bin name used to construct the controller
+const char* DStubController::stub_bin_name_ = "TestBin";
+
+
+DControllerBasePtr&
+DStubController::instance() {
+    // If the singleton hasn't been created, do it now.
+    if (!getController()) {
+        DControllerBasePtr p(new DStubController());
+        setController(p);
+    }
+
+    return (getController());
+}
+
+DStubController::DStubController()
+    : DControllerBase(stub_app_name_, stub_bin_name_),
+      processed_signals_(), record_signal_only_(false), use_alternate_parser_(false) {
+}
+
+bool
+DStubController::customOption(int option, char* /* optarg */)
+{
+    // Check for the custom option supported by DStubController.
+    if (static_cast<char>(option) == *stub_option_x_) {
+        return (true);
+    }
+
+    return (false);
+}
+
+DProcessBase* DStubController::createProcess() {
+    if (SimFailure::shouldFailOn(SimFailure::ftCreateProcessException)) {
+        // Simulates a failure to instantiate the process due to exception.
+        throw std::runtime_error("SimFailure::ftCreateProcess");
+    }
+
+    if (SimFailure::shouldFailOn(SimFailure::ftCreateProcessNull)) {
+        // Simulates a failure to instantiate the process.
+        return (NULL);
+    }
+
+    // This should be a successful instantiation.
+    return (new DStubProcess(getAppName().c_str(), getIOService()));
+}
+
+const std::string DStubController::getCustomOpts() const {
+    // Return the "list" of custom options supported by DStubController.
+    return (std::string(stub_option_x_));
+}
+
+void
+DStubController::processSignal(int signum){
+    processed_signals_.push_back(signum);
+    if (record_signal_only_) {
+        return;
+    }
+
+    DControllerBase::processSignal(signum);
+}
+
+isc::data::ConstElementPtr
+DStubController::parseFile(const std::string& /*file_name*/) {
+    isc::data::ConstElementPtr elements;
+    if (use_alternate_parser_) {
+        std::ostringstream os;
+
+        os << "{ \"" << getController()->getAppName()
+            << "\": " << std::endl;
+        os <<  "{ \"string_test\": \"alt value\" } ";
+        os << " } " << std::endl;
+        elements = isc::data::Element::fromJSON(os.str());
+    }
+
+    return (elements);
+}
+
+DStubController::~DStubController() {
+}
+
+//************************** DControllerTest *************************
+
+void
+DControllerTest::writeFile(const std::string& content,
+                           const std::string& module_name) {
+    std::ofstream out(CFG_TEST_FILE, std::ios::trunc);
+    ASSERT_TRUE(out.is_open());
+
+    out << "{ \"" << (!module_name.empty() ? module_name
+                      : getController()->getAppName())
+        << "\": " << std::endl;
+
+    out << content;
+    out << " } " << std::endl;
+    out.close();
+}
+
+void
+DControllerTest::timedWriteCallback() {
+    writeFile(new_cfg_content_);
+}
+
+void
+DControllerTest::scheduleTimedWrite(const std::string& config,
+                                    int write_time_ms) {
+    new_cfg_content_ = config;
+    write_timer_.reset(new asiolink::IntervalTimer(*getIOService()));
+    write_timer_->setup(std::bind(&DControllerTest::timedWriteCallback, this),
+                        write_time_ms, asiolink::IntervalTimer::ONE_SHOT);
+}
+
+void
+DControllerTest::runWithConfig(const std::string& config, int run_time_ms,
+                               time_duration& elapsed_time) {
+    // Create the config file.
+    writeFile(config);
+
+    // Shutdown (without error) after runtime.
+    isc::asiolink::IntervalTimer timer(*getIOService());
+    timer.setup(genShutdownCallback, run_time_ms);
+
+    // Record start time, and invoke launch().
+    // We catch and rethrow to allow testing error scenarios.
+    ptime start = microsec_clock::universal_time();
+    try  {
+        // Set up valid command line arguments
+        char* argv[] = { const_cast<char*>("progName"),
+                         const_cast<char*>("-c"),
+                         const_cast<char*>(DControllerTest::CFG_TEST_FILE),
+                         const_cast<char*>("-d") };
+        launch(4, argv);
+    } catch (...) {
+        // calculate elapsed time, then rethrow it
+        elapsed_time = microsec_clock::universal_time() - start;
+        throw;
+    }
+
+    elapsed_time = microsec_clock::universal_time() - start;
+}
+
+void
+DControllerTest::runWithConfig(const std::string& config, int run_time_ms,
+                               const TestCallback& callback,
+                               time_duration& elapsed_time) {
+    // Create the config file.
+    writeFile(config);
+
+    // Shutdown (without error) after runtime.
+    isc::asiolink::IntervalTimer timer(*getIOService());
+    timer.setup([&] { callback(); genShutdownCallback(); }, run_time_ms);
+
+    // Record start time, and invoke launch().
+    // We catch and rethrow to allow testing error scenarios.
+    ptime start = microsec_clock::universal_time();
+    try  {
+        // Set up valid command line arguments
+        char* argv[] = { const_cast<char*>("progName"),
+                         const_cast<char*>("-c"),
+                         const_cast<char*>(DControllerTest::CFG_TEST_FILE),
+                         const_cast<char*>("-d") };
+        launch(4, argv);
+    } catch (...) {
+        // calculate elapsed time, then rethrow it
+        elapsed_time = microsec_clock::universal_time() - start;
+        throw;
+    }
+
+    elapsed_time = microsec_clock::universal_time() - start;
+}
+
+DProcessBasePtr
+DControllerTest:: getProcess() {
+    DProcessBasePtr p;
+    if (getController()) {
+        p = getController()->getProcess();
+    }
+    return (p);
+}
+
+DCfgMgrBasePtr
+DControllerTest::getCfgMgr() {
+    DCfgMgrBasePtr p;
+    if (getProcess()) {
+        p = getProcess()->getCfgMgr();
+    }
+
+    return (p);
+}
+
+ConfigPtr
+DControllerTest::getContext() {
+    ConfigPtr p;
+    if (getCfgMgr()) {
+        p = getCfgMgr()->getContext();
+    }
+
+    return (p);
+}
+
+// Initialize controller wrapper's static instance getter member.
+DControllerTest::InstanceGetter DControllerTest::instanceGetter_ = NULL;
+
+/// @brief Defines the name of the configuration file to use
+const char* DControllerTest::CFG_TEST_FILE = "d2-test-config.json";
+
+//************************** DStubContext *************************
+
+DStubContext::DStubContext() {
+}
+
+DStubContext::~DStubContext() {
+}
+
+ConfigPtr
+DStubContext::clone() {
+    return (ConfigPtr(new DStubContext(*this)));
+}
+
+DStubContext::DStubContext(const DStubContext& rhs): ConfigBase(rhs) {
+}
+
+isc::data::ElementPtr
+DStubContext::toElement() const {
+    return (isc::data::Element::createMap());
+}
+
+//************************** DStubCfgMgr *************************
+
+DStubCfgMgr::DStubCfgMgr()
+    : DCfgMgrBase(ConfigPtr(new DStubContext())) {
+}
+
+DStubCfgMgr::~DStubCfgMgr() {
+}
+
+ConfigPtr
+DStubCfgMgr::createNewContext() {
+    return (ConfigPtr (new DStubContext()));
+}
+
+isc::data::ConstElementPtr
+DStubCfgMgr::parse(isc::data::ConstElementPtr /*config*/, bool /*check_only*/) {
+    return (isc::config::createAnswer(isc::config::CONTROL_RESULT_SUCCESS,
+                                      "It all went fine. I promise"));
+}
+
+} // namespace isc::process
+} // namespace isc
diff --git a/src/lib/process/testutils/d_test_stubs.h b/src/lib/process/testutils/d_test_stubs.h
new file mode 100644
index 0000000..9881ee4
--- /dev/null
+++ b/src/lib/process/testutils/d_test_stubs.h
@@ -0,0 +1,753 @@
+// Copyright (C) 2013-2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef D_TEST_STUBS_H
+#define D_TEST_STUBS_H
+
+#include <asiolink/interval_timer.h>
+
+#include <cc/data.h>
+#include <cc/command_interpreter.h>
+
+#include <log/logger_support.h>
+
+#include <process/d_controller.h>
+#include <process/d_cfg_mgr.h>
+
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+using namespace boost::posix_time;
+
+#include <gtest/gtest.h>
+
+#include <fstream>
+#include <iostream>
+#include <sstream>
+
+namespace isc {
+namespace process {
+
+/// @brief Class is used to set a globally accessible value that indicates
+/// a specific type of failure to simulate.  Test derivations of base classes
+/// can exercise error handling code paths by testing for specific SimFailure
+/// values at the appropriate places and then causing the error to "occur".
+/// The class consists of an enumerated set of failures, and static methods
+/// for getting, setting, and testing the current value.
+class SimFailure {
+public:
+    enum FailureType {
+        ftUnknown = -1,
+        ftNoFailure = 0,
+        ftCreateProcessException,
+        ftCreateProcessNull,
+        ftProcessInit,
+        ftProcessConfigure,
+        ftProcessShutdown,
+        ftElementBuild,
+        ftElementCommit,
+        ftElementUnknown
+    };
+
+    /// @brief Sets the SimFailure value to the given value.
+    ///
+    /// @param value is the new value to assign to the global value.
+    static void set(enum FailureType value) {
+       failure_type_ = value;
+    }
+
+    /// @brief Gets the current global SimFailure value
+    ///
+    /// @return returns the current SimFailure value
+    static enum FailureType get() {
+       return (failure_type_);
+    }
+
+    /// @brief One-shot test of the SimFailure value. If the global
+    /// SimFailure value is equal to the given value, clear the global
+    /// value and return true.  This makes it convenient for code to
+    /// test and react without having to explicitly clear the global
+    /// value.
+    ///
+    /// @param value is the value against which the global value is
+    /// to be compared.
+    ///
+    /// @return returns true if current SimFailure value matches the
+    /// given value.
+    static bool shouldFailOn(enum FailureType value) {
+        if (failure_type_ == value) {
+            clear();
+            return (true);
+        }
+
+        return (false);
+    }
+
+    /// @brief Resets the failure type to none.
+    static void clear() {
+       failure_type_ = ftNoFailure;
+    }
+
+    /// @brief Static value for holding the failure type to simulate.
+    static enum FailureType failure_type_;
+};
+
+/// @brief Test Derivation of the DProcessBase class.
+///
+/// This class is used primarily to server as a test process class for testing
+/// DControllerBase.  It provides minimal, but sufficient implementation to
+/// test the majority of DControllerBase functionality.
+class DStubProcess : public DProcessBase {
+public:
+
+    /// @brief Constructor
+    ///
+    /// @param name name is a text label for the process. Generally used
+    /// in log statements, but otherwise arbitrary.
+    /// @param io_service is the io_service used by the caller for
+    /// asynchronous event handling.
+    ///
+    /// @throw DProcessBaseError is io_service is NULL.
+    DStubProcess(const char* name, asiolink::IOServicePtr io_service);
+
+    /// @brief Invoked after process instantiation to perform initialization.
+    /// This implementation supports simulating an error initializing the
+    /// process by throwing a DProcessBaseError if SimFailure is set to
+    /// ftProcessInit.
+    virtual void init();
+
+    /// @brief Implements the process's event loop.
+    /// This implementation is quite basic, surrounding calls to
+    /// io_service->runOne() with a test of the shutdown flag. Once invoked,
+    /// the method will continue until the process itself is exiting due to a
+    /// request to shutdown or some anomaly forces an exit.
+    /// @return  returns 0 upon a successful, "normal" termination, non-zero to
+    /// indicate an abnormal termination.
+    virtual void run();
+
+    /// @brief Implements the process shutdown procedure.
+    ///
+    /// This sets the instance shutdown flag monitored by run()  and stops
+    /// the IO service.
+    virtual isc::data::ConstElementPtr shutdown(isc::data::ConstElementPtr);
+
+    /// @brief Processes the given configuration.
+    ///
+    /// This implementation fails if SimFailure is set to ftProcessConfigure.
+    /// Otherwise it will complete successfully.  It does not check the content
+    /// of the inbound configuration.
+    ///
+    /// @param config_set a new configuration (JSON) for the process
+    /// @param check_only true if configuration is to be verified only, not applied
+    /// @return an Element that contains the results of configuration composed
+    /// of an integer status value (0 means successful, non-zero means failure),
+    /// and a string explanation of the outcome.
+    virtual isc::data::ConstElementPtr
+    configure(isc::data::ConstElementPtr config_set, bool check_only);
+
+    /// @brief Returns configuration summary in the textual format.
+    ///
+    /// @return Always an empty string.
+    virtual std::string getConfigSummary(const uint32_t) {
+        return ("");
+    }
+
+    /// @brief Destructor
+    virtual ~DStubProcess();
+};
+
+
+/// @brief Test Derivation of the DControllerBase class.
+///
+/// DControllerBase is an abstract class and therefore requires a derivation
+/// for testing.  It allows testing the majority of the base class code
+/// without polluting production derivations (e.g. D2Process).  It uses
+/// DStubProcess as its application process class.  It is a full enough
+/// implementation to support running both stand alone and integrated.
+class DStubController : public DControllerBase {
+public:
+    /// @brief Static singleton instance method. This method returns the
+    /// base class singleton instance member.  It instantiates the singleton
+    /// and sets the base class instance member upon first invocation.
+    ///
+    /// @return returns a pointer reference to the singleton instance.
+    static DControllerBasePtr& instance();
+
+    /// @brief Defines a custom command line option supported by
+    /// DStubController.
+    static const char* stub_option_x_;
+
+    /// @brief Defines the app name used to construct the controller
+    static const char* stub_app_name_;
+
+    /// @brief Defines the executable name used to construct the controller
+    static const char* stub_bin_name_;
+
+    /// @brief Gets the list of signals that have been caught and processed.
+    std::vector<int>& getProcessedSignals() {
+        return (processed_signals_);
+    }
+
+    /// @brief Deals with other (i.e. not application name) global objects.
+    using DControllerBase::handleOtherObjects;
+
+    /// @brief Controls whether signals are processed in full or merely
+    /// recorded.
+    ///
+    /// If true, signal handling will stop after recording the signal.
+    /// Otherwise the base class signal handler,
+    /// DControllerBase::processSignals will also be invoked. This switch is
+    /// useful for ensuring that IOSignals are delivered as expected without
+    /// incurring the full impact such as reconfiguring or shutting down.
+    ///
+    /// @param value boolean which if true enables record-only behavior
+    void recordSignalOnly(bool value) {
+       record_signal_only_ = value;
+    }
+
+    /// @brief Determines if parseFile() implementation is used
+    ///
+    /// If true, parseFile() will return a Map of elements with fixed content,
+    /// mimicking a controller which is using alternate JSON parsing.
+    /// If false, parseFile() will return an empty pointer mimicking a
+    /// controller which is using original JSON parsing supplied by the
+    /// Element class.
+    ///
+    /// @param value boolean which if true enables record-only behavior
+    void useAlternateParser(bool value) {
+       use_alternate_parser_ = value;
+    }
+
+protected:
+    /// @brief Handles additional command line options that are supported
+    /// by DStubController.  This implementation supports an option "-x".
+    ///
+    /// @param option is the option "character" from the command line, without
+    /// any prefixing hyphen(s)
+    /// @optarg optarg is the argument value (if one) associated with the option
+    ///
+    /// @return returns true if the option is "x", otherwise ti returns false.
+    virtual bool customOption(int option, char *optarg);
+
+    /// @brief Instantiates an instance of DStubProcess.
+    ///
+    /// This implementation will fail if SimFailure is set to
+    /// ftCreateProcessException OR ftCreateProcessNull.
+    ///
+    /// @return returns a pointer to the new process instance (DProcessBase*)
+    /// or NULL if SimFailure is set to ftCreateProcessNull.
+    /// @throw throws std::runtime_error if SimFailure is set to
+    /// ftCreateProcessException.
+    virtual DProcessBase* createProcess();
+
+    /// @brief Provides a string of the additional command line options
+    /// supported by DStubController.  DStubController supports one
+    /// addition option, stub_option_x_.
+    ///
+    /// @return returns a string containing the option letters.
+    virtual const std::string getCustomOpts() const;
+
+    /// @brief Application-level "signal handler"
+    ///
+    /// Overrides the base class implementation such that this method
+    /// is invoked each time an IOSignal is processed.  It records the
+    /// signal received and unless we are in record-only behavior, it
+    /// in invokes the base class implementation.
+    ///
+    /// @param signum OS signal value received
+    virtual void processSignal(int signum);
+
+    /// @brief Provides alternate parse file implementation
+    ///
+    /// Overrides the base class implementation to mimic controllers which
+    /// implement alternate file parsing.  If enabled via useAlternateParser()
+    /// the method will return a fixed map of elements reflecting the following
+    /// JSON:
+    ///
+    /// @code
+    ///     { "<name>getController()->getAppName()" :
+    ///          { "string_test": "alt value" };
+    ///     }
+    ///
+    /// @endcode
+    ///
+    ///  where <name> is getController()->getAppName()
+    ///
+    /// otherwise it return an empty pointer.
+    virtual isc::data::ConstElementPtr parseFile(const std::string&);
+
+public:
+
+    /// @brief Provides additional extended version text
+    ///
+    /// Overrides the base class implementation so we can
+    /// verify the getting the extended version text
+    /// contains derivation specific contributions.
+    virtual std::string getVersionAddendum() {
+        return ("StubController Version Text");
+    }
+
+private:
+    /// @brief Constructor is private to protect singleton integrity.
+    DStubController();
+
+    /// @brief Vector to record the signal values received.
+    std::vector<int> processed_signals_;
+
+    /// @brief Boolean for controlling if signals are merely recorded.
+    bool record_signal_only_;
+
+    /// @brief Boolean for controlling if parseFile is "implemented"
+    bool use_alternate_parser_;
+
+public:
+    virtual ~DStubController();
+};
+
+/// @brief Defines a pointer to a DStubController.
+typedef boost::shared_ptr<DStubController> DStubControllerPtr;
+
+/// @brief Abstract Test fixture class that wraps a DControllerBase. This class
+/// is a friend class of DControllerBase which allows it access to class
+/// content to facilitate testing.  It provides numerous wrapper methods for
+/// the protected and private methods and member of the base class.
+class DControllerTest : public ::testing::Test {
+public:
+
+    /// @brief Defines a function pointer for controller singleton fetchers.
+    typedef DControllerBasePtr& (*InstanceGetter)();
+
+    /// @brief Static storage of the controller class's singleton fetcher.
+    /// We need this this statically available for callbacks.
+    static InstanceGetter instanceGetter_;
+
+    /// @brief Constructor
+    ///
+    /// @param instance_getter is a function pointer to the static instance
+    /// method of the DControllerBase derivation under test.
+    DControllerTest(InstanceGetter instance_getter)
+         : write_timer_(), new_cfg_content_() {
+        // Set the static fetcher member, then invoke it via getController.
+        // This ensures the singleton is instantiated.
+        instanceGetter_ = instance_getter;
+        getController();
+    }
+
+    /// @brief Destructor
+    /// Note the controller singleton is destroyed. This is essential to ensure
+    /// a clean start between tests.
+    virtual ~DControllerTest() {
+        // Some unit tests update the logging configuration which has a side
+        // effect that all subsequent tests print the output to stdout. This
+        // is to ensure that the logging settings are back to default.
+        isc::log::setDefaultLoggingOutput();
+
+        if (write_timer_) {
+            write_timer_->cancel();
+        }
+
+        getController().reset();
+        static_cast<void>(remove(CFG_TEST_FILE));
+    }
+
+    /// @brief Convenience method that destructs and then recreates the
+    /// controller singleton under test.  This is handy for tests within
+    /// tests.
+    void resetController() {
+        getController().reset();
+        getController();
+    }
+
+    /// @brief Static method which returns the instance of the controller
+    /// under test.
+    /// @return returns a reference to the controller instance.
+    static DControllerBasePtr& getController() {
+        return ((*instanceGetter_)());
+    }
+
+    /// @brief Returns true if the Controller's app name matches the
+    /// given value.
+    ///
+    /// @param should_be is the value to compare against.
+    ///
+    /// @return returns true if the values are equal.
+    bool checkAppName(const std::string& should_be) {
+        return (getController()->getAppName().compare(should_be) == 0);
+    }
+
+    /// @brief Returns true if the Controller's service name matches the
+    /// given value.
+    ///
+    /// @param should_be is the value to compare against.
+    ///
+    /// @return returns true if the values are equal.
+    bool checkBinName(const std::string& should_be) {
+        return (getController()->getBinName().compare(should_be) == 0);
+    }
+
+    /// @brief Tests the existence of the Controller's application process.
+    ///
+    /// @return returns true if the process instance exists.
+    bool checkProcess() {
+        return (getController()->process_.get() != 0);
+    }
+
+    /// @brief Tests the existence of the Controller's IOService.
+    ///
+    /// @return returns true if the IOService exists.
+    bool checkIOService() {
+        return (getController()->io_service_.get() != 0);
+    }
+
+    /// @brief Gets the Controller's IOService.
+    ///
+    /// @return returns a reference to the IOService
+    asiolink::IOServicePtr& getIOService() {
+        return (getController()->io_service_);
+    }
+
+    /// @brief Compares verbose flag with the given value.
+    ///
+    /// @param value
+    ///
+    /// @return returns true if the verbose flag is equal to the given value.
+    bool checkVerbose(bool value) {
+        return (getController()->isVerbose() == value);
+    }
+
+    /// @brief Compares configuration file name with the given value.
+    ///
+    /// @param value file name to compare against
+    ///
+    /// @return returns true if the verbose flag is equal to the given value.
+    bool checkConfigFileName(const std::string& value) {
+        return (getController()->getConfigFile() == value);
+    }
+
+    /// @Wrapper to invoke the Controller's parseArgs method.  Please refer to
+    /// DControllerBase::parseArgs for details.
+    void parseArgs(int argc, char* argv[]) {
+        getController()->parseArgs(argc, argv);
+    }
+
+    /// @Wrapper to invoke the Controller's init method.  Please refer to
+    /// DControllerBase::init for details.
+    void initProcess() {
+        getController()->initProcess();
+    }
+
+    /// @Wrapper to invoke the Controller's launch method.  Please refer to
+    /// DControllerBase::launch for details.
+    void launch(int argc, char* argv[]) {
+        optind = 1;
+        getController()->launch(argc, argv, true);
+    }
+
+    /// @Wrapper to invoke the Controller's updateConfig method.  Please
+    /// refer to DControllerBase::updateConfig for details.
+    isc::data::ConstElementPtr updateConfig(isc::data::ConstElementPtr
+                                            new_config) {
+        return (getController()->updateConfig(new_config));
+    }
+
+    /// @Wrapper to invoke the Controller's checkConfig method.  Please
+    /// refer to DControllerBase::checkConfig for details.
+    isc::data::ConstElementPtr checkConfig(isc::data::ConstElementPtr
+                                           new_config) {
+        return (getController()->checkConfig(new_config));
+    }
+
+    /// @brief Callback that will generate shutdown command via the
+    /// command callback function.
+    static void genShutdownCallback() {
+        isc::data::ElementPtr arg_set;
+        getController()->shutdownHandler(SHUT_DOWN_COMMAND, arg_set);
+    }
+
+    /// @brief Callback that throws an exception.
+    static void genFatalErrorCallback() {
+        isc_throw (DProcessBaseError, "simulated fatal error");
+    }
+
+    /// @brief writes specified content to a well known file
+    ///
+    /// Writes given JSON content to CFG_TEST_FILE. It will wrap the
+    /// content within a JSON element whose name is equal to the controller's
+    /// app name or the given module name if not blank:
+    ///
+    /// @code
+    ///    { "<app_name>" : <content> }
+    /// @endcode
+    ///
+    /// suffix the content within a JSON element with the given module
+    /// name or  wrapped by a JSON
+    /// element  . Tests will
+    /// attempt to read that file.
+    ///
+    /// @param content JSON text to be written to file
+    /// @param module_name  content content to be written to file
+    void writeFile(const std::string& content,
+                   const std::string& module_name = "");
+
+    /// @brief Method used as timer callback to invoke writeFile.
+    ///
+    /// Wraps a call to writeFile passing in new_cfg_content_.  This allows
+    /// the method to be bound as an IntervalTimer callback.
+    virtual void timedWriteCallback();
+
+    /// @brief Schedules the given content to overwrite the config file.
+    ///
+    /// Creates a one-shot IntervalTimer whose callback will overwrite the
+    /// configuration with the given content.  This allows the configuration
+    /// file to replaced write_time_ms after DControllerBase::launch() has
+    /// invoked runProcess().
+    ///
+    /// @param config JSON string containing the desired content for the config
+    /// file.
+    /// @param write_time_ms time in milliseconds to delay before writing the
+    /// file.
+    void scheduleTimedWrite(const std::string& config, int write_time_ms);
+
+    /// @brief Convenience method for invoking standard, valid launch
+    ///
+    /// This method sets up a timed run of the DController::launch.  It does
+    /// the following:
+    /// - It creates command line argument variables argc/argv
+    /// - Invokes writeFile to create the config file with the given content
+    /// - Schedules a shutdown time timer to call DController::executeShutdown
+    /// after the interval
+    /// - Records the start time
+    /// - Invokes DController::launch() with the command line arguments
+    /// - After launch returns, it calculates the elapsed time and returns it
+    ///
+    /// @param config configuration file content to write before calling launch
+    /// @param run_time_ms  maximum amount of time to allow runProcess() to
+    /// continue.
+    /// @param[out] elapsed_time the actual time in ms spent in launch().
+    void runWithConfig(const std::string& config, int run_time_ms,
+                       time_duration& elapsed_time);
+
+    /// @brief Type of testing callbacks
+    typedef std::function<void()> TestCallback;
+
+    /// @brief Convenience method for invoking standard, valid launch
+    /// with a testing callback
+    ///
+    /// This method sets up a timed run of the DController::launch.  It does
+    /// the following:
+    /// - It creates command line argument variables argc/argv
+    /// - Invokes writeFile to create the config file with the given content
+    /// - Schedules a shutdown time timer to call DController::executeShutdown
+    /// after the interval
+    /// - Records the start time
+    /// - Invokes DController::launch() with the command line arguments
+    /// - After launch returns, it calculates the elapsed time and returns it
+    ///
+    /// @note the callback is called before the shutdown and MUST NOT throw
+    /// @param config configuration file content to write before calling launch
+    /// @param run_time_ms  maximum amount of time to allow runProcess() to
+    /// continue.
+    /// @param callback testing callback of TestCallback type
+    /// @param[out] elapsed_time the actual time in ms spent in launch().
+    void runWithConfig(const std::string& config, int run_time_ms,
+                       const TestCallback& callback,
+                       time_duration& elapsed_time);
+
+    /// @brief Fetches the controller's process
+    ///
+    /// @return A pointer to the process which may be null if it has not yet
+    /// been instantiated.
+    DProcessBasePtr getProcess();
+
+    /// @brief Fetches the process's configuration manager
+    ///
+    /// @return A pointer to the manager which may be null if it has not yet
+    /// been instantiated.
+    DCfgMgrBasePtr getCfgMgr();
+
+    /// @brief Fetches the configuration manager's context
+    ///
+    /// @return A pointer to the context which may be null if it has not yet
+    /// been instantiated.
+    ConfigPtr getContext();
+
+    /// @brief Timer used for delayed configuration file writing.
+    asiolink::IntervalTimerPtr write_timer_;
+
+    /// @brief String which contains the content delayed file writing will use.
+    std::string new_cfg_content_;
+
+    /// @brief Name of a config file used during tests
+    static const char* CFG_TEST_FILE;
+};
+
+/// @brief Test Derivation of the ConfigBase class.
+///
+/// This class is used to test basic functionality of configuration context.
+/// It adds an additional storage container "extra values" to mimic an
+/// application extension of configuration storage.  This permits testing that
+/// both the base class content as well as the application content is
+/// correctly copied during cloning.  This is vital to configuration backup
+/// and rollback during configuration parsing.
+class DStubContext : public ConfigBase {
+public:
+
+    /// @brief Constructor
+    DStubContext();
+
+    /// @brief Destructor
+    virtual ~DStubContext();
+
+    /// @brief Creates a clone of a DStubContext.
+    ///
+    /// @return returns a pointer to the new clone.
+    virtual ConfigPtr clone();
+
+protected:
+    /// @brief Copy constructor
+    DStubContext(const DStubContext& rhs);
+
+private:
+    /// @brief Private assignment operator, not implemented.
+    DStubContext& operator=(const DStubContext& rhs);
+
+    /// @brief Unparse a configuration object
+    ///
+    /// @return a pointer to a configuration
+    virtual isc::data::ElementPtr toElement() const;
+};
+
+/// @brief Defines a pointer to DStubContext.
+typedef boost::shared_ptr<DStubContext> DStubContextPtr;
+
+/// @brief Test Derivation of the DCfgMgrBase class.
+///
+/// This class is used to test basic functionality of configuration management.
+/// It supports the following configuration elements:
+///
+/// "bool_test" - Boolean element, tests parsing and committing a boolean
+///               configuration parameter.
+/// "uint32_test" - Uint32 element, tests parsing and committing a uint32_t
+///               configuration parameter.
+/// "string_test" - String element, tests parsing and committing a string
+///               configuration parameter.
+/// "extra_test" - "Extra" element, tests parsing and committing an extra
+///               configuration parameter. (This is used to demonstrate
+///               derivation's addition of storage to configuration context.
+///
+/// It also keeps track of the element ids that are parsed in the order they
+/// are parsed.  This is used to test ordered and non-ordered parsing.
+class DStubCfgMgr : public DCfgMgrBase {
+public:
+    /// @brief Constructor
+    DStubCfgMgr();
+
+    /// @brief Destructor
+    virtual ~DStubCfgMgr();
+
+    /// @brief Pretends to parse the config
+    ///
+    /// This method pretends to parse the configuration specified on input
+    /// and returns a positive answer. The check_only flag is currently ignored.
+    ///
+    /// @param config configuration specified
+    /// @param check_only whether it's real configuration (false) or just
+    ///                configuration check (true)
+    /// @return always positive answer
+    ///
+    isc::data::ConstElementPtr
+    parse(isc::data::ConstElementPtr config, bool check_only);
+
+    /// @brief Returns a summary of the configuration in the textual format.
+    ///
+    /// @return Always an empty string.
+    virtual std::string getConfigSummary(const uint32_t) {
+        return ("");
+    }
+
+    /// @todo
+    virtual ConfigPtr createNewContext();
+};
+
+/// @brief Defines a pointer to DStubCfgMgr.
+typedef boost::shared_ptr<DStubCfgMgr> DStubCfgMgrPtr;
+
+/// @brief Test fixture base class for any fixtures which test parsing.
+/// It provides methods for converting JSON strings to configuration element
+/// sets and checking parse results
+class ConfigParseTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    ConfigParseTest(){
+    }
+
+    /// @brief Destructor
+    ~ConfigParseTest() {
+    }
+
+    /// @brief Converts a given JSON string into an Element set and stores the
+    /// result the member variable, config_set_.
+    ///
+    /// @param json_text contains the configuration text in JSON format to
+    /// convert.
+    /// @return returns AssertionSuccess if there were no parsing errors,
+    /// AssertionFailure otherwise.
+    ::testing::AssertionResult fromJSON(const std::string& json_text) {
+        try  {
+            config_set_ = isc::data::Element::fromJSON(json_text);
+        } catch (const isc::Exception &ex) {
+            return (::testing::AssertionFailure(::testing::Message() <<
+                                                "JSON text failed to parse:"
+                                                << ex.what()));
+        }
+
+        return (::testing::AssertionSuccess());
+    }
+
+    /// @brief Compares the status in the  parse result stored in member
+    /// variable answer_ to a given value.
+    ///
+    /// @param should_be is an integer against which to compare the status.
+    ///
+    /// @return returns AssertionSuccess if there were no parsing errors,
+    /// AssertionFailure otherwise.
+    ::testing::AssertionResult checkAnswer(int should_be) {
+        return (checkAnswer(answer_, should_be));
+    }
+
+    /// @brief Compares the status in the given parse result to a given value.
+    ///
+    /// @param answer Element set containing an integer response and string
+    /// comment.
+    /// @param should_be is an integer against which to compare the status.
+    ///
+    /// @return returns AssertionSuccess if there were no parsing errors,
+    /// AssertionFailure otherwise.
+    ::testing::AssertionResult checkAnswer(isc::data::ConstElementPtr answer,
+                                           int should_be) {
+        int rcode = 0;
+        isc::data::ConstElementPtr comment;
+        comment = isc::config::parseAnswer(rcode, answer);
+        if (rcode == should_be) {
+            return (testing::AssertionSuccess());
+        }
+
+        return (::testing::AssertionFailure(::testing::Message() <<
+                                            "checkAnswer rcode:" << rcode
+                                            << " comment: " << *comment));
+    }
+
+    /// @brief Configuration set being tested.
+    isc::data::ElementPtr config_set_;
+
+    /// @brief Results of most recent element parsing.
+    isc::data::ConstElementPtr answer_;
+};
+
+} // namespace isc::process
+} // namespace isc
+
+#endif