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-<?xml version='1.0'?> <!--*-nxml-*-->
-<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="systemd.swap">
- <refentryinfo>
- <title>systemd.swap</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd.swap</refentrytitle>
- <manvolnum>5</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd.swap</refname>
- <refpurpose>Swap unit configuration</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd.swap</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>A unit configuration file whose name ends in
- <filename>.swap</filename> encodes information about a
- swap device or file for memory paging controlled and
- supervised by systemd.</para>
-
- <para>This man page lists the configuration options
- specific to this unit type. 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 swap
- specific configuration options are configured in the
- [Swap] section.</para>
-
- <para>Additional options are listed in
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- which define the execution environment the
- <citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- binary is executed in, and in
- <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- which define the way the processes are
- terminated.</para>
-
- <para>Swap units must be named after the devices
- or files they control. Example: the swap device
- <filename>/dev/sda5</filename> must be configured in a
- unit file <filename>dev-sda5.swap</filename>. For
- details about the escaping logic used to convert a
- file system path to a unit name see
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
-
- <para>All swap units automatically get the appropriate
- dependencies on the devices or on the mount points
- of the files they are activated from.</para>
-
- <para>Swap units with
- <varname>DefaultDependencies=</varname> enabled
- implicitly acquire a conflicting dependency to
- <filename>umount.target</filename> so that they are
- deactivated at shutdown.</para>
- </refsect1>
-
- <refsect1>
- <title><filename>fstab</filename></title>
-
- <para>Swap units may either be configured via unit
- files, or via <filename>/etc/fstab</filename> (see
- <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details). Swaps listed in
- <filename>/etc/fstab</filename> will be converted into
- native units dynamically at boot and when the
- configuration of the system manager is
- reloaded. See
- <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for details about the conversion.</para>
-
- <para>If a swap device or file is configured in both
- <filename>/etc/fstab</filename> and a unit file the
- configuration in the latter takes precedence.</para>
-
- <para>Unless the <option>noauto</option> option is set
- for them all swap units configured in
- <filename>/etc/fstab</filename> are also added as
- requirements to <filename>swap.target</filename>, so
- that they are waited for and activated during
- boot.</para>
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>Swap files must include a [Swap] section, which
- carries information about the swap device it
- supervises. A number of options that may be used in
- this section are shared with other unit types. These
- options are documented in
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- and
- <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
- options specific to the [Swap] section of swap units
- are the following:</para>
-
- <variablelist>
-
- <varlistentry>
- <term><varname>What=</varname></term>
- <listitem><para>Takes an absolute path
- of a device node or file to use for
- paging. See
- <citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for details. If this refers to a
- device node, a dependency on the
- respective device unit is
- automatically created. (See
- <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information.) If this refers
- to a file, a dependency on the
- respective mount unit is automatically
- created. (See
- <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more information.) This option is
- mandatory.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><varname>Priority=</varname></term>
-
- <listitem><para>Swap priority to use
- when activating the swap device or
- file. This takes an integer. This
- setting is optional.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><varname>TimeoutSec=</varname></term>
- <listitem><para>Configures the time to
- wait for the swapon command to
- finish. If a command does not exit
- within the configured time the swap
- will be considered failed and be shut
- down again. All commands still running
- will be terminated forcibly via
- SIGTERM, and after another delay of
- this time with SIGKILL. (See
- <option>KillMode=</option> in
- <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>.)
- Takes a unit-less value in seconds, or
- a time span value such as "5min
- 20s". Pass 0 to disable the timeout
- logic. Defaults to
- 90s.</para></listitem>
- </varlistentry>
- </variablelist>
-
- <para>Check
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- and
- <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for more settings.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>