chiark / gitweb /
man: update systemd-nspawn regarding new --slice= logic
[elogind.git] / man / systemd.timer.xml
index 5845383..fa67d59 100644 (file)
@@ -9,16 +9,16 @@
   Copyright 2010 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  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
-  General Public License for more details.
+  Lesser General Public License for more details.
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 -->
 
 
         <refnamediv>
                 <refname>systemd.timer</refname>
-                <refpurpose>systemd timer configuration files</refpurpose>
+                <refpurpose>Timer unit configuration</refpurpose>
         </refnamediv>
 
         <refsynopsisdiv>
-                <para><filename>systemd.timer</filename></para>
+                <para><filename><replaceable>timer</replaceable>.timer</filename></para>
         </refsynopsisdiv>
 
         <refsect1>
                 <title>Description</title>
 
                 <para>A unit configuration file whose name ends in
-                <filename>.timer</filename> encodes information about
+                <literal>.timer</literal> encodes information about
                 a timer controlled and supervised by systemd, for
                 timer-based activation.</para>
 
                 timer specific configuration options are configured in
                 the [Timer] section.</para>
 
-                <para>For each timer file a matching unit file must
+                <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
+                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>
                 defines. The options specific to the [Timer] section
                 of timer units are the following:</para>
 
-                <variablelist>
+                <variablelist class='unit-directives'>
                         <varlistentry>
-                                <term><varname>OnActive=</varname></term>
-                                <term><varname>OnBootup=</varname></term>
-                                <term><varname>OnStartup=</varname></term>
-                                <term><varname>OnUnitActive=</varname></term>
-                                <term><varname>OnUnitInactive=</varname></term>
+                                <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
+                                <listitem><para>Defines monotonic timers
                                 relative to different starting points:
-                                <varname>OnActive=</varname> defines a
+                                <varname>OnActiveSec=</varname> defines a
                                 timer relative to the moment the timer
                                 itself is
-                                activated. <varname>OnBootup=</varname>
+                                activated. <varname>OnBootSec=</varname>
                                 defines a timer relative to when the
                                 machine was booted
-                                up. <varname>OnStartup=</varname>
+                                up. <varname>OnStartupSec=</varname>
                                 defines a timer relative to when
-                                systemd was
-                                started. <varname>OnUnitActive=</varname>
+                                systemd was first
+                                started. <varname>OnUnitActiveSec=</varname>
                                 defines a timer relative to when the
                                 unit the timer is activating was last
-                                activated. <varname>OnUnitInactive=</varname>
+                                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
+                                combined of the same and of different
                                 types. For example, by combining
-                                <varname>OnBoot=</varname> and
-                                <varname>OnUnitActive=</varname> it is
+                                <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
 
                                 <para>The arguments to the directives
                                 are time spans configured in
-                                seconds. Example: "OnBoot=50" means
+                                seconds. Example: "OnBootSec=50" means
                                 50s after boot-up. The argument may
                                 also include time units. Example:
-                                "OnBoot=5h 30min" means 5 hours and 30
-                                minutes after boot-up. For details
+                                "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>OnBootup=</varname> or
-                                <varname>OnStartup=</varname> is
+                                <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>
+                                directives.</para>
 
                                 <para>These are monotonic timers,
-                                independant of wall-clock time and timezones. If the
+                                independent of wall-clock time and timezones. If the
                                 computer is temporarily suspended, the
                                 monotonic clock stops too.</para>
 
+                                <para>If the empty string is assigned
+                                to any of these options, the list of
+                                timers is reset, and all prior
+                                assignments will have no
+                                effect.</para></listitem>
+
+                        </varlistentry>
+
+                        <varlistentry>
+                                <term><varname>OnCalendar=</varname></term>
+
+                                <listitem><para>Defines realtime
+                                (i.e. wallclock) timers via calendar
+                                event expressions. See
+                                <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+                                for more information on the syntax of
+                                calendar event expressions. Otherwise
+                                the semantics are similar to
+                                <varname>OnActiveSec=</varname> and
+                                related settings.</para></listitem>
                         </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
+                                <literal>.timer</literal>. 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
-                                is chosen identical except for the
+                                are named identically, except for the
                                 suffix.</para></listitem>
                         </varlistentry>
                 </variablelist>
         <refsect1>
                   <title>See Also</title>
                   <para>
-                          <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+                          <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>
+                          <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+                          <citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+                          <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
                   </para>
         </refsect1>