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

NAME

       systemd.target - Target unit configuration

SYNOPSIS

       target.target

DESCRIPTION

       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).

IMPLICIT DEPENDENCIES

       There are no implicit dependencies for target units.

DEFAULT DEPENDENCIES

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

       o   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.

       o   Target units automatically gain Conflicts= dependency against shutdown.target.

EXAMPLE

       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

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

systemd 237															 SYSTEMD.TARGET(5)