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For some unit types we have hundreds of options, and the reader may easily miss that more options are described in other pages. We already mentioned this in the introduction and then at the top of the option list, but it can't hurt to repeat the information. Also, add an (almost empty) Options section for the unit types which don't have any custom options. It is nicer to have the same page structure in all cases, so people can jump between pages for different types more easily.
123 lines
5.5 KiB
XML
123 lines
5.5 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="systemd.slice">
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<refentryinfo>
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<title>systemd.slice</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.slice</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.slice</refname>
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<refpurpose>Slice unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>slice</replaceable>.slice</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>A unit configuration file whose name ends in <literal>.slice</literal> encodes information about a slice
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unit. A slice unit is a concept for hierarchically managing resources of a group of processes. This management is
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performed by creating a node in the Linux Control Group (cgroup) tree. Units that manage processes (primarily scope
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and service units) may be assigned to a specific slice. For each slice, certain resource limits may be set that
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apply to all processes of all units contained in that slice. Slices are organized hierarchically in a tree. The
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name of the slice encodes the location in the tree. The name consists of a dash-separated series of names, which
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describes the path to the slice from the root slice. The root slice is named <filename>-.slice</filename>. Example:
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<filename>foo-bar.slice</filename> is a slice that is located within <filename>foo.slice</filename>, which in turn
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is located in the root slice <filename>-.slice</filename>.
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</para>
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<para>Note that slice units cannot be templated, nor is possible to add multiple names to a slice unit by creating
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additional symlinks to its unit file.</para>
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<para>By default, service and scope units are placed in
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<filename>system.slice</filename>, virtual machines and containers
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registered with
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<citerefentry><refentrytitle>systemd-machined</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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are found in <filename>machine.slice</filename>, and user sessions
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handled by
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<citerefentry><refentrytitle>systemd-logind</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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in <filename>user.slice</filename>. See
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for more information.</para>
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<para>See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for the common options of all unit configuration
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files. The common configuration items are configured
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in the generic [Unit] and [Install] sections. The
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slice specific configuration options are configured in
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the [Slice] section. Currently, only generic resource control settings
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as described in
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry> are allowed.
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</para>
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<para>See the <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/ControlGroupInterface/">New
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Control Group Interfaces</ulink> for an introduction on how to make
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use of slice units from programs.</para>
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</refsect1>
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<refsect1>
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<title>Automatic Dependencies</title>
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<refsect2>
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<title>Implicit Dependencies</title>
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<para>The following dependencies are implicitly added:</para>
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<itemizedlist>
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<listitem><para>Slice units automatically gain dependencies of type
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<varname>After=</varname> and <varname>Requires=</varname> on
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their immediate parent slice unit.</para></listitem>
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</itemizedlist>
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</refsect2>
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<refsect2>
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<title>Default Dependencies</title>
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<para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
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<itemizedlist>
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<listitem><para>Slice units will automatically have dependencies of type <varname>Conflicts=</varname> and
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<varname>Before=</varname> on
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<filename>shutdown.target</filename>. These ensure that slice units are removed prior to system shutdown.
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Only slice units involved with late system shutdown should disable
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<varname>DefaultDependencies=</varname> option.</para></listitem>
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</itemizedlist>
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</refsect2>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>Slice unit files may include [Unit] and [Install] sections, which are described in
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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No options specific to this file type are supported.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.scope</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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