Adding upstream version 4.0.upstream/4.0upstream

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

1 files changed, 165 insertions, 0 deletions

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+Installation
+
+The software is distributed as source code which has to be compiled. The source
+code is supplied in the form of a gzipped tar file, which unpacks to a
+subdirectory identifying the name and version of the program.
+
+A C compiler (e.g. gcc or clang) and GNU Make are needed to build chrony. The
+following libraries with their development files, and programs, are needed to
+enable optional features:
+
+  o pkg-config: detection of development libraries
+
+  o Nettle, NSS, or LibTomCrypt: secure hash functions (SECHASH)
+
+  o libcap: dropping root privileges on Linux (DROPROOT)
+
+  o libseccomp: system call filter on Linux (SCFILTER)
+
+  o GnuTLS and Nettle: Network Time Security (NTS)
+
+  o Editline: line editing in chronyc (READLINE)
+
+  o timepps.h header: PPS reference clock
+
+  o Asciidoctor: documentation in HTML format
+
+  o Bash: test suite
+
+The following programs are needed when building chrony from the git repository
+instead of a released tar file:
+
+  o Asciidoctor: manual pages
+
+  o Bison: parser for chronyc settime command
+
+After unpacking the source code, change directory into it, and type
+
+./configure
+
+This is a shell script that automatically determines the system type. There is
+an optional parameter --prefix, which indicates the directory tree where the
+software should be installed. For example,
+
+./configure --prefix=/opt/free
+
+will install the chronyd daemon into /opt/free/sbin and the chronyc control
+program into /opt/free/bin. The default value for the prefix is /usr/local.
+
+The configure script assumes you want to use gcc as your compiler. If you want
+to use a different compiler, you can configure this way:
+
+CC=cc ./configure --prefix=/opt/free
+
+for Bourne-family shells, or
+
+setenv CC cc
+setenv CFLAGS -O
+./configure --prefix=/opt/free
+
+for C-family shells.
+
+If the software cannot (yet) be built on your system, an error message will be
+shown. Otherwise, Makefile will be generated.
+
+On Linux, if development files for the libcap library are available, chronyd
+will be built with support for dropping root privileges. On other systems no
+extra library is needed. The default user which chronyd should run as can be
+specified with the --with-user option of the configure script.
+
+If development files for the POSIX threads library are available, chronyd will
+be built with support for asynchronous resolving of hostnames specified in the
+server, peer, and pool directives. This allows chronyd operating as a server to
+respond to client requests when resolving a hostname. If you don't want to
+enable the support, specify the --disable-asyncdns flag to configure.
+
+If development files for the Nettle, NSS, or libtomcrypt library are available,
+chronyd will be built with support for other cryptographic hash functions than
+MD5, which can be used for NTP authentication with a symmetric key. If you
+don't want to enable the support, specify the --disable-sechash flag to
+configure.
+
+If development files for the editline library are available, chronyc will be
+built with line editing support. If you don't want this, specify the
+--disable-readline flag to configure.
+
+If a timepps.h header is available (e.g. from the LinuxPPS project), chronyd
+will be built with PPS API reference clock driver. If the header is installed
+in a location that isn't normally searched by the compiler, you can add it to
+the searched locations by setting the CPPFLAGS variable to -I/path/to/timepps.
+
+The --help option can be specified to configure to print all options supported
+by the script.
+
+Now type
+
+make
+
+to build the programs.
+
+If you want to build the manual in HTML, type
+
+make docs
+
+Once the programs have been successfully compiled, they need to be installed in
+their target locations. This step normally needs to be performed by the
+superuser, and requires the following command to be entered.
+
+make install
+
+This will install the binaries and man pages.
+
+To install the HTML version of the manual, enter the command
+
+make install-docs
+
+Now that the software is successfully installed, the next step is to set up a
+configuration file. The default location of the file is /etc/chrony.conf.
+Several examples of configuration with comments are included in the examples
+directory. Suppose you want to use public NTP servers from the pool.ntp.org
+project as your time reference. A minimal useful configuration file could be
+
+pool pool.ntp.org iburst
+makestep 1.0 3
+rtcsync
+
+Then, chronyd can be run. For security reasons, it's recommended to create an
+unprivileged user for chronyd and specify it with the -u command-line option or
+the user directive in the configuration file, or set the default user with the
+--with-user configure option before building.
+
+Support for system call filtering
+
+chronyd can be built with support for the Linux secure computing (seccomp)
+facility. This requires development files for the libseccomp library and the
+--enable-scfilter option specified to configure. The -F option of chronyd will
+enable a system call filter, which should significantly reduce the kernel
+attack surface and possibly prevent kernel exploits from chronyd if it is
+compromised.
+
+Extra options for package builders
+
+The configure and make procedures have some extra options that may be useful if
+you are building a distribution package for chrony.
+
+The --mandir=DIR option to configure specifies an installation directory for
+the man pages. This overrides the man subdirectory of the argument to the
+--prefix option.
+
+./configure --prefix=/usr --mandir=/usr/share/man
+
+to set both options together.
+
+The final option is the DESTDIR option to the make command. For example, you
+could use the commands
+
+./configure --prefix=/usr --mandir=/usr/share/man
+make all docs
+make install DESTDIR=./tmp
+cd tmp
+tar cvf - . | gzip -9 > chrony.tar.gz
+
+to build a package. When untarred within the root directory, this will install
+the files to the intended final locations.
+
+Last updated 2020-10-07 17:27:34 +0200