systemd.slice — Slice unit configuration
slice.slice
A unit configuration file whose name ends in ".slice" encodes information about a slice
unit. A slice unit is a concept for hierarchically managing resources of a group of processes. This management is
performed by creating a node in the Linux Control Group (cgroup) tree. Units that manage processes (primarily scope
and service units) may be assigned to a specific slice. For each slice, certain resource limits may be set that
apply to all processes of all units contained in that slice. Slices are organized hierarchically in a tree. The
name of the slice encodes the location in the tree. The name consists of a dash-separated series of names, which
describes the path to the slice from the root slice. The root slice is named -.slice. Example:
foo-bar.slice is a slice that is located within foo.slice, which in turn
is located in the root slice -.slice.
Note that slice units cannot be templated, nor is possible to add multiple names to a slice unit by creating additional symlinks to its unit file.
By default, service and scope units are placed in
system.slice, virtual machines and containers
registered with
systemd-machined(8)
are found in machine.slice, and user sessions
handled by
systemd-logind(8)
in user.slice. See
systemd.special(7)
for more information.
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 slice specific configuration options are configured in the [Slice] section. Currently, only generic resource control settings as described in systemd.resource-control(5) are allowed.
See the New Control Group Interfaces for an introduction on how to make use of slice units from programs.
The following dependencies are implicitly added:
Slice units automatically gain dependencies of type
After= and Requires= on
their immediate parent slice unit.
The following dependencies are added unless DefaultDependencies=no is set:
Slice units will automatically have dependencies of type Conflicts= and
Before= on
shutdown.target. These ensure that slice units are removed prior to system shutdown.
Only slice units involved with late system shutdown should disable
DefaultDependencies= option.
Slice unit files may include [Unit] and [Install] sections, which are described in systemd.unit(5).
Slice files may include a [Slice] section. Options that may be used in this section are shared with other unit types. These options are documented in systemd.resource-control(5).