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c129bd5df3
For all units ensure there's an "Automatic Dependencies" section in the man page, and explain which dependencies are automatically added in all cases, and which ones are added on top if DefaultDependencies=yes is set. This is also done for systemd.exec(5), systemd.resource-control(5) and systemd.unit(5) as these pages describe common behaviour of various unit types.
134 lines
5.6 KiB
XML
134 lines
5.6 KiB
XML
<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2013 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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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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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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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
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<literal>.slice</literal> encodes information about a slice which
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is a concept for hierarchically managing resources of a group of
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processes. This management is performed by creating a node in the
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Linux Control Group (cgroup) tree. Units that manage processes
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(primarily scope and service units) may be assigned to a specific
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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
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slice. Slices are organized hierarchically in a tree. The name of
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the slice encodes the location in the tree. The name consists of a
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dash-separated series of names, which describes the path to the
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slice from the root slice. The root slice is named,
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<filename>-.slice</filename>. Example:
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<filename>foo-bar.slice</filename> is a slice that is located
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within <filename>foo.slice</filename>, which in turn is located in
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the root slice <filename>-.slice</filename>.
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</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>1</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>1</manvolnum></citerefentry>
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in <filename>user.slice</filename>. See
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<citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>5</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="http://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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<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>
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<para>Unless <varname>DefaultDependencies=false</varname>
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is used, slice units will implicitly have dependencies of
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type <varname>Conflicts=</varname> and
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<varname>Before=</varname> on
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<filename>shutdown.target</filename>. These ensure
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that slice units are removed prior to system
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shutdown. Only slice units involved with early boot or
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late system shutdown should disable this option.
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</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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