systemd.target — Target unit configuration
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
which are used by the SysV runlevel compatibility code in systemd.
There are no implicit dependencies for target units.
The following dependencies are added unless
DefaultDependencies=no is set:
Target units will automatically complement all
configured dependencies of type
Requires= with dependencies of type
is set in the specified units. Note that
Requires= must be defined in the target unit itself — if
you for example define
some.service, the automatic ordering will not be added.
Target units automatically gain
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
DefaultDependencies=no, so they are suitable for use
in this target, and do not pull in
You can now switch into this emergency mode by running
isolate emergency-net.target or by passing the option
systemd.unit=emergency-net.target on the kernel command
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
modifying them by using systemctl add-wants.