115 lines
5.2 KiB
XML
115 lines
5.2 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="systemd.slice">
|
|
<refentryinfo>
|
|
<title>systemd.slice</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd.slice</refentrytitle>
|
|
<manvolnum>5</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd.slice</refname>
|
|
<refpurpose>Slice unit configuration</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename><replaceable>slice</replaceable>.slice</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>A unit configuration file whose name ends in <literal>.slice</literal> 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 <filename>-.slice</filename>. Example:
|
|
<filename>foo-bar.slice</filename> is a slice that is located within <filename>foo.slice</filename>, which in turn
|
|
is located in the root slice <filename>-.slice</filename>.
|
|
</para>
|
|
|
|
<para>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.</para>
|
|
|
|
<para>By default, service and scope units are placed in
|
|
<filename>system.slice</filename>, virtual machines and containers
|
|
registered with
|
|
<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
are found in <filename>machine.slice</filename>, and user sessions
|
|
handled by
|
|
<citerefentry><refentrytitle>systemd-logind</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
in <filename>user.slice</filename>. See
|
|
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
for more information.</para>
|
|
|
|
<para>See
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
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
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> are allowed.
|
|
</para>
|
|
|
|
<para>See the <ulink
|
|
url="https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New
|
|
Control Group Interfaces</ulink> for an introduction on how to make
|
|
use of slice units from programs.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Automatic Dependencies</title>
|
|
|
|
<refsect2>
|
|
<title>Implicit Dependencies</title>
|
|
|
|
<para>The following dependencies are implicitly added:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>Slice units automatically gain dependencies of type
|
|
<varname>After=</varname> and <varname>Requires=</varname> on
|
|
their immediate parent slice unit.</para></listitem>
|
|
</itemizedlist>
|
|
</refsect2>
|
|
|
|
<refsect2>
|
|
<title>Default Dependencies</title>
|
|
|
|
<para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
|
|
|
|
<itemizedlist>
|
|
<listitem><para>Slice units will automatically have dependencies of type <varname>Conflicts=</varname> and
|
|
<varname>Before=</varname> on
|
|
<filename>shutdown.target</filename>. These ensure that slice units are removed prior to system shutdown.
|
|
Only slice units involved with late system shutdown should disable
|
|
<varname>DefaultDependencies=</varname> option.</para></listitem>
|
|
</itemizedlist>
|
|
</refsect2>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|