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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:35:18 +0000
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treea5df1a06754bdd014cb975c051c83b01c9a97532 /man/systemd.slice.xml
parentInitial commit. (diff)
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Adding upstream version 252.22.upstream/252.22
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?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>Options</title>
+
+ <para>Slice unit files may include [Unit] and [Install] sections, which are described in
+ <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ No options specific to this file type are supported.</para>
+ </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>