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-<?xml version='1.0'?> <!--*-nxml-*-->
-<!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><replaceable>swap</replaceable>.swap</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para>A unit configuration file whose name ends in
- <literal>.swap</literal> 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 project='man-pages'><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, and in
- <citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- which configure resource control settings for the processes of the
- service.</para>
-
- <para>Swap units must be named after the devices
- or files they control. Example: the swap device
- <filename noindex='true'>/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 project='man-pages'><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>When reading <filename>/etc/fstab</filename> a few special
- options are understood by systemd which influence how dependencies
- are created for swap units.</para>
-
- <variablelist class='fstab-options'>
- <varlistentry>
- <term><option>noauto</option></term>
- <term><option>auto</option></term>
-
- <listitem><para>With <option>noauto</option> the swap unit
- will not be added as a dependency for
- <filename>swap.target</filename>. This means that it will not
- be activated automatically during boot, unless it is pulled in
- by some other unit. Option <option>auto</option> has the
- opposite meaning and is the default.</para>
- </listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>nofail</option></term>
-
- <listitem><para>With <option>nofail</option> the swap unit
- will be only wanted, not required by
- <filename>swap.target</filename>. This means that the boot
- will continue even if this swap device is not activated
- successfully.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </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 class='unit-directives'>
-
- <varlistentry>
- <term><varname>What=</varname></term>
- <listitem><para>Takes an absolute path of a device node or
- file to use for paging. See
- <citerefentry project='man-pages'><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>Options=</varname></term>
-
- <listitem><para>May contain an option string for the swap
- device. This may be used for controlling discard options among
- other functionality, if the swap backing device supports the
- discard or trim operation. (See
- <citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- for more information.) </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 <constant>SIGTERM</constant>, and after another
- delay of this time with <constant>SIGKILL</constant>. (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 <literal>0</literal> to disable the
- timeout logic. Defaults to
- <varname>DefaultTimeoutStartSec=</varname> from the manager
- configuration file (see
- <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
- </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>1</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.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>
~ianmdlvl / elogind.git / blobdiff