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       systemd.timer - Timer unit configuration




       A unit configuration file whose name ends in ".timer" encodes
       information about a timer controlled and supervised by systemd, for
       timer-based activation.

       This man page lists the configuration options specific to this unit
       type. See systemd.unit(5) 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.

       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 foo.timer activates a matching service foo.service. The unit
       to activate may be controlled by Unit= (see below).

       Unless DefaultDependencies= is set to false, timer units will
       implicitly have dependencies of type Conflicts= and Before= on 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.


       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:

       OnActiveSec=, OnBootSec=, OnStartupSec=, OnUnitActiveSec=,
           Defines monotonic timers relative to different starting points:
           OnActiveSec= defines a timer relative to the moment the timer
           itself is activated.  OnBootSec= defines a timer relative to when
           the machine was booted up.  OnStartupSec= defines a timer relative
           to when systemd was first started.  OnUnitActiveSec= defines a
           timer relative to when the unit the timer is activating was last
           activated.  OnUnitInactiveSec= defines a timer relative to when the
           unit the timer is activating was last deactivated.

           Multiple directives may be combined of the same and of different
           types. For example, by combining OnBootSec= and OnUnitActiveSec=,
           it is possible to define a timer that elapses in regular intervals
           and activates a specific service each time.

           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 systemd.unit(5).

           If a timer configured with OnBootSec= or OnStartupSec= 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.

           These are monotonic timers, independent of wall-clock time and
           timezones. If the computer is temporarily suspended, the monotonic
           clock stops too.

           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.

           Defines realtime (i.e. wallclock) timers via calendar event
           expressions. See systemd.time(7) for more information on the syntax
           of calendar event expressions. Otherwise the semantics are similar
           to OnActiveSec= and related settings.

           The unit to activate when this timer elapses. The argument is a
           unit name, whose suffix is not ".timer". 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.


       systemd(1), systemctl(8), systemd.unit(5), systemd.service(5),
       systemd.time(7), systemd.directives(7)

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