systemd.target(5) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | AUTOMATIC DEPENDENCIES | EXAMPLE | SEE ALSO | COLOPHON

SYSTEMD.TARGET(5)            systemd.target            SYSTEMD.TARGET(5)

NAME         top

       systemd.target - Target unit configuration

SYNOPSIS         top

       target.target

DESCRIPTION         top

       A unit configuration file whose name ends in ".target" encodes
       information about a target unit of systemd, which is used for
       grouping units and as well-known synchronization points during
       start-up.

       This unit type has no specific options. 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. A separate [Target] section does not exist,
       since no target-specific options may be configured.

       Target units do not offer any additional functionality on top of
       the generic functionality provided by units. They exist merely to
       group units via dependencies (useful as boot targets), and to
       establish standardized names for synchronization points used in
       dependencies between units. Among other things, target units are
       a more flexible replacement for SysV runlevels in the classic
       SysV init system. (And for compatibility reasons special target
       units such as runlevel3.target exist which are used by the SysV
       runlevel compatibility code in systemd. See systemd.special(7)
       for details).

AUTOMATIC DEPENDENCIES         top

   Implicit Dependencies
       There are no implicit dependencies for target units.

   Default Dependencies
       The following dependencies are added unless
       DefaultDependencies=no is set:

       •   Target units will automatically complement all configured
           dependencies of type Wants= or Requires= with dependencies of
           type After= unless DefaultDependencies=no is set in the
           specified units. Note that Wants= or Requires= must be
           defined in the target unit itself — if you for example define
           Wants=some.target in some.service, the automatic ordering
           will not be added.

       •   Target units automatically gain Conflicts= and Before=
           dependencies against shutdown.target.

EXAMPLE         top

       Example 1. Simple standalone target

           # emergency-net.target

           [Unit]
           Description=Emergency Mode with Networking
           Requires=emergency.target systemd-networkd.service
           After=emergency.target systemd-networkd.service
           AllowIsolate=yes

       When adding dependencies to other units, it's important to check
       if they set DefaultDependencies=. Service units, unless they set
       DefaultDependencies=no, automatically get a dependency on
       sysinit.target. In this case, both emergency.target and
       systemd-networkd.service have DefaultDependencies=no, so they are
       suitable for use in this target, and do not pull in
       sysinit.target.

       You can now switch into this emergency mode by running systemctl
       isolate emergency-net.target or by passing the option
       systemd.unit=emergency-net.target on the kernel command line.

       Other units can have WantedBy=emergency-net.target in the
       [Install] section. After they are enabled using systemctl enable,
       they will be started before emergency-net.target is started. It
       is also possible to add arbitrary units as dependencies of
       emergency.target without modifying them by using systemctl
       add-wants.

SEE ALSO         top

       systemd(1), systemctl(1), systemd.unit(5), systemd.special(7),
       systemd.directives(7)

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-04-01.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-04-01.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 248                                            SYSTEMD.TARGET(5)

Pages that refer to this page: systemctl(1)systemd(1)systemd.unit(5)bootup(7)systemd.directives(7)systemd.index(7)systemd.special(7)systemd.syntax(7)lvm2-activation-generator(8)runlevel(8)systemd-sysv-generator(8)systemd-xdg-autostart-generator(8)