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479fe882ae
Especially sentences like "filename ends in .suffix" are easier to parse if the suffix is surrounded by quotes. In sentences like "requires a .service unit", where the suffix is used as a class designation, there is no need to use quotes.
216 lines
11 KiB
XML
216 lines
11 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.timer">
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<refentryinfo>
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<title>systemd.timer</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.timer</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.timer</refname>
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<refpurpose>Timer unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>timer</replaceable>.timer</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in
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<literal>.timer</literal> encodes information about
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a timer controlled and supervised by systemd, for
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timer-based activation.</para>
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<para>This man page lists the configuration options
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specific to this unit type. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration
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files. The common configuration items are configured
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in the generic [Unit] and [Install] sections. The
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timer specific configuration options are configured in
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the [Timer] section.</para>
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<para>For each timer file, a matching unit file must
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exist, describing the unit to activate when the timer
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elapses. By default, a service by the same name as the
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timer (except for the suffix) is activated. Example: a
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timer file <filename>foo.timer</filename> activates a
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matching service <filename>foo.service</filename>. The
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unit to activate may be controlled by
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<varname>Unit=</varname> (see below).</para>
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<para>Unless <varname>DefaultDependencies=</varname>
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is set to <option>false</option>, timer units will
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implicitly have dependencies of type
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<varname>Conflicts=</varname> and
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<varname>Before=</varname> on
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<filename>shutdown.target</filename>. These ensure
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that timer units are stopped cleanly prior to system
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shutdown. Only timer units involved with early boot or
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late system shutdown should disable this
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option.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>Timer files must include a [Timer] section,
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which carries information about the timer it
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defines. The options specific to the [Timer] section
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of timer units are the following:</para>
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<variablelist class='unit-directives'>
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<varlistentry>
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<term><varname>OnActiveSec=</varname></term>
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<term><varname>OnBootSec=</varname></term>
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<term><varname>OnStartupSec=</varname></term>
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<term><varname>OnUnitActiveSec=</varname></term>
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<term><varname>OnUnitInactiveSec=</varname></term>
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<listitem><para>Defines monotonic timers
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relative to different starting points:
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<varname>OnActiveSec=</varname> defines a
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timer relative to the moment the timer
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itself is
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activated. <varname>OnBootSec=</varname>
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defines a timer relative to when the
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machine was booted
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up. <varname>OnStartupSec=</varname>
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defines a timer relative to when
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systemd was first
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started. <varname>OnUnitActiveSec=</varname>
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defines a timer relative to when the
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unit the timer is activating was last
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activated. <varname>OnUnitInactiveSec=</varname>
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defines a timer relative to when the
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unit the timer is activating was last
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deactivated.</para>
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<para>Multiple directives may be
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combined of the same and of different
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types. For example, by combining
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<varname>OnBootSec=</varname> and
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<varname>OnUnitActiveSec=</varname> it is
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possible to define a timer that
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elapses in regular intervals and
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activates a specific service each
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time.</para>
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<para>The arguments to the directives
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are time spans configured in
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seconds. Example: "OnBootSec=50" means
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50s after boot-up. The argument may
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also include time units. Example:
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"OnBootSec=5h 30min" means 5 hours and
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30 minutes after boot-up. For details
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about the syntax of time spans see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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<para>If a timer configured with
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<varname>OnBootSec=</varname> or
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<varname>OnStartupSec=</varname> is
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already in the past when the timer
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unit is activated, it will immediately
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elapse and the configured unit is
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started. This is not the case for
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timers defined in the other
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directives.</para>
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<para>These are monotonic timers,
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independent of wall-clock time and timezones. If the
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computer is temporarily suspended, the
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monotonic clock stops too.</para>
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<para>If the empty string is assigned
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to any of these options, the list of
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timers is reset, and all prior
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assignments will have no
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effect.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>OnCalendar=</varname></term>
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<listitem><para>Defines realtime
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(i.e. wallclock) timers via calendar
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event expressions. See
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for more information on the syntax of
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calendar event expressions. Otherwise
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the semantics are similar to
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<varname>OnActiveSec=</varname> and
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related settings.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Unit=</varname></term>
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<listitem><para>The unit to activate
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when this timer elapses. The argument is a
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unit name, whose suffix is not
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<literal>.timer</literal>. If not
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specified, this value defaults to a
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service that has the same name as the
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timer unit, except for the
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suffix. (See above.) It is recommended
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that the unit name that is activated
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and the unit name of the timer unit
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are named identically, except for the
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suffix.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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