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From 6fe43c70ac008feaf26f49420c559565e3b50528 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Mon, 30 Dec 2013 00:11:30 -0500
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Subject: [PATCH] man: expand on some more subtle points in systemd.socket(5)
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http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=727708#1694
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---
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man/systemd.socket.xml | 67 ++++++++++++++++++++++++++++++++++++--------------
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1 file changed, 49 insertions(+), 18 deletions(-)
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diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml
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index ac3127d..570a6fb 100644
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--- a/man/systemd.socket.xml
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+++ b/man/systemd.socket.xml
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@@ -85,21 +85,26 @@
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processes of the socket.</para>
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<para>For each socket file a matching service file
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- (see
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+ must exist, describing the service to start on
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+ incoming traffic on the socket (see
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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- for details) must exist, describing the service to
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- start on incoming traffic on the socket. Depending on
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- the setting of <option>Accept=</option> (see below),
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- this must either be named like the socket unit, but
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- with the suffix replaced; or it must be a template
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- file named the same way. Example: a socket file
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+ for more information about .service files). The name
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+ of the .service unit is by default the same as the
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+ name of the .socket unit, but can be altered with
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+ <option>Service=</option> option described below.
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+ Depending on the setting of <option>Accept=</option>
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+ option described below, this .service unit must either
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+ be named like the .socket unit, but with the suffix
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+ replaced, unless overridden with
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+ <option>Service=</option>; or it must be a template
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+ unit named the same way. Example: a socket file
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<filename>foo.socket</filename> needs a matching
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service <filename>foo.service</filename> if
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<option>Accept=false</option> is set. If
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- <option>Accept=true</option> is set, a service template
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- file <filename>foo@.service</filename> must exist from
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- which services are instantiated for each incoming
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- connection.</para>
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+ <option>Accept=true</option> is set, a service
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+ template file <filename>foo@.service</filename> must
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+ exist from which services are instantiated for each
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+ incoming connection.</para>
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<para>Unless <varname>DefaultDependencies=</varname>
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is set to <option>false</option>, socket units will
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@@ -116,9 +121,21 @@
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boot or late system shutdown should disable this
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option.</para>
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+ <para>Socket units will have a
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+ <varname>Before=</varname> dependency on the service
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+ which they trigger added implicitly. No implicit
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+ <varname>WantedBy=</varname> or
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+ <varname>RequiredBy=</varname> dependency from the
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+ socket to the service is added. This means that the
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+ service may be started without the socket, in which
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+ case it must be able to open sockets by itself. To
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+ prevent this, an explicit <varname>Requires=</varname>
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+ dependency may be added.</para>
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+
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<para>Socket units may be used to implement on-demand
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starting of services, as well as parallelized starting
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- of services.</para>
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+ of services. See the blog stories linked at the end
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+ for introduction.</para>
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<para>Note that the daemon software configured for
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socket activation with socket units needs to be able
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@@ -221,12 +238,23 @@
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of any of these options will have no
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effect.</para>
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+ <para>It is also possible to have more
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+ than one socket unit for the same
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+ service when using
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+ <varname>Service=</varname>, and the
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+ service will receive all the sockets
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+ configured in all the socket units.
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+ Sockets configured in one unit are
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+ passed in the order of configuration,
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+ but no ordering between socket units
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+ is specified.</para>
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+
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<para>If an IP address is used here,
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it is often desirable to listen on it
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before the interface it is configured
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on is up and running, and even
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regardless of whether it will be up and
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- running ever at all. To deal with this
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+ running at any point. To deal with this
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it is recommended to set the
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<varname>FreeBind=</varname> option
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described below.</para></listitem>
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@@ -687,11 +715,14 @@
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<term><varname>Service=</varname></term>
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<listitem><para>Specifies the service
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unit name to activate on incoming
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- traffic. This defaults to the service
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- that bears the same name as the socket
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- (ignoring the different suffixes). In
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- most cases it should not be necessary
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- to use this option.</para></listitem>
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+ traffic. This setting is only allowed
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+ for sockets with
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+ <varname>Accept=no</varname>. It
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+ defaults to the service that bears the
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+ same name as the socket (with the
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+ suffix replaced). In most cases it
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+ should not be necessary to use this
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+ option.</para></listitem>
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</varlistentry>
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</variablelist>
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