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-<?xml version='1.0'?> <!--*-nxml-*-->
-<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="systemd.timer">
- <refentryinfo>
- <title>systemd.timer</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd.timer</refentrytitle>
- <manvolnum>5</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd.timer</refname>
- <refpurpose>Timer unit configuration</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd.timer</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>A unit configuration file whose name ends in
- <filename>.timer</filename> encodes information about
- a timer controlled and supervised by systemd, for
- timer-based activation.</para>
-
- <para>This man page lists the configuration options
- specific to this unit type. See
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for the common options of all unit configuration
- files. The common configuration items are configured
- in the generic [Unit] and [Install] sections. The
- timer specific configuration options are configured in
- the [Timer] section.</para>
-
- <para>For each timer file, a matching unit file must
- exist, describing the unit to activate when the timer
- elapses. By default, a service by the same name as the
- timer (except for the suffix) is activated. Example: a
- timer file <filename>foo.timer</filename> activates a
- matching service <filename>foo.service</filename>. The
- unit to activate may be controlled by
- <varname>Unit=</varname> (see below).</para>
-
- <para>Unless <varname>DefaultDependencies=</varname>
- is set to <option>false</option>, timer units will
- implicitly have dependencies of type
- <varname>Conflicts=</varname> and
- <varname>Before=</varname> on
- <filename>shutdown.target</filename>. These ensure
- that timer units are stopped cleanly prior to system
- shutdown. Only timer units involved with early boot or
- late system shutdown should disable this
- option.</para>
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>Timer files must include a [Timer] section,
- which carries information about the timer it
- defines. The options specific to the [Timer] section
- of timer units are the following:</para>
-
- <variablelist>
- <varlistentry>
- <term><varname>OnActiveSec=</varname></term>
- <term><varname>OnBootSec=</varname></term>
- <term><varname>OnStartupSec=</varname></term>
- <term><varname>OnUnitActiveSec=</varname></term>
- <term><varname>OnUnitInactiveSec=</varname></term>
-
- <listitem><para>Defines timers
- relative to different starting points:
- <varname>OnActiveSec=</varname> defines a
- timer relative to the moment the timer
- itself is
- activated. <varname>OnBootSec=</varname>
- defines a timer relative to when the
- machine was booted
- up. <varname>OnStartupSec=</varname>
- defines a timer relative to when
- systemd was
- started. <varname>OnUnitActiveSec=</varname>
- defines a timer relative to when the
- unit the timer is activating was last
- activated. <varname>OnUnitInactiveSec=</varname>
- defines a timer relative to when the
- unit the timer is activating was last
- deactivated.</para>
-
- <para>Multiple directives may be
- combined of the same and of different
- types. For example, by combining
- <varname>OnBootSec=</varname> and
- <varname>OnUnitActiveSec=</varname> it is
- possible to define a timer that
- elapses in regular intervals and
- activates a specific service each
- time.</para>
-
- <para>The arguments to the directives
- are time spans configured in
- seconds. Example: "OnBootSec=50" means
- 50s after boot-up. The argument may
- also include time units. Example:
- "OnBootSec=5h 30min" means 5 hours and 30
- minutes after boot-up. For details
- about the syntax of time spans see
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
-
- <para>If a timer configured with
- <varname>OnBootSec=</varname> or
- <varname>OnStartupSec=</varname> is
- already in the past when the timer
- unit is activated, it will immediately
- elapse and the configured unit is
- started. This is not the case for
- timers defined in the other
- directives.</para></listitem>
-
- <para>These are monotonic timers,
- independent of wall-clock time and timezones. If the
- computer is temporarily suspended, the
- monotonic clock stops too.</para>
-
- </varlistentry>
- <varlistentry>
- <term><varname>Unit=</varname></term>
-
- <listitem><para>The unit to activate
- when this timer elapses. The argument is a
- unit name, whose suffix is not
- <filename>.timer</filename>. If not
- specified, this value defaults to a
- service that has the same name as the
- timer unit, except for the
- suffix. (See above.) It is recommended
- that the unit name that is activated
- and the unit name of the timer unit
- are named identically, except for the
- suffix.</para></listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>