Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

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

1 files changed, 51 insertions, 0 deletions

diff --git a/doc/wiki/IMAPServer.Hibernation.txt b/doc/wiki/IMAPServer.Hibernation.txt
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+++ b/doc/wiki/IMAPServer.Hibernation.txt
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+Hibernation
+===========
+
+This is not supported on kqueue based systems currently, such as FreeBSD.
+
+Dovecot supports moving connections that have issued IDLE to a special holding
+process, called imap-hibernate. This process is responsible for holding the
+idle processes until they need to be thawed.
+
+Configuration
+-------------
+
+'imap_hibernate_timeout' specifies the delay before moving users to
+'imap-hibernate' process. This requires inter-process communication between
+'imap' and 'imap-hibernate' process.
+
+---%<-------------------------------------------------------------------------
+imap_hibernate_timeout = 5s
+
+service imap {
+  # Note that this change will allow any process running as
+  # $default_internal_user (dovecot) to access mails as any other user.
+  # This may be insecure in some installations, which is why this isn't
+  # done by default.
+  unix_listener imap-master {
+    user = $default_internal_user
+  }
+}
+
+# The following is the default already in v2.3.1+:
+service imap {
+  extra_groups = $default_internal_group
+}
+service imap-hibernate {
+  unix_listener imap-hibernate {
+    mode = 0660
+    group = $default_internal_group
+  }
+}
+---%<-------------------------------------------------------------------------
+
+How it works
+------------
+
+When client issues IDLE, the connection socket is moved to the hibernation
+process. This process is responsible for keeping all connections that are
+idling, until they issue some command that requires them to be thawed into a
+imap process. This way, memory and CPU resources are saved, since there is only
+one hibernation process.
+
+(This file was created from the wiki on 2019-06-19 12:42)