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5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
223 lines
11 KiB
XML
223 lines
11 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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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 2010 Lennart Poettering
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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.swap">
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<refentryinfo>
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<title>systemd.swap</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.swap</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.swap</refname>
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<refpurpose>systemd swap configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd.swap</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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<filename>.swap</filename> encodes information about a
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swap device or file for memory paging controlled and
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supervised by systemd.</para>
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<para>This man page lists the configuration options
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specific to this unit type. 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 swap
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specific configuration options are configured in the
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[Swap] section.</para>
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<para>Swap units must be named after the devices
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(resp. files) they control. Example: the swap device
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<filename>/dev/sda5</filename> must be configured in a
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unit file <filename>dev-sda5.swap</filename>. For
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details about the escaping logic used to convert a
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file system path to a unit name see
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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<para>All swap units automatically get the appropriate
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dependencies on the devices (resp. on the mount points
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of the files) they are activated from.</para>
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<para>Swap units with
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<varname>DefaultDependencies=</varname> enabled
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implicitly acquire a conflicting dependency to
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<filename>umount.target</filename> so that they are
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deactivated at shutdown.</para>
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</refsect1>
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<refsect1>
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<title><filename>fstab</filename></title>
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<para>Swap units may either be configured via unit
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files, or via <filename>/etc/fstab</filename> (see
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<citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details).</para>
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<para>If a swap device or file is configured in both
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<filename>/etc/fstab</filename> and a unit file the
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configuration in the latter takes precedence.</para>
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<para>Unless the <option>noauto</option> option is set
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for them all swap units configured in
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<filename>/etc/fstab</filename> are also added as
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requirements to <filename>swap.target</filename>, so
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that they are waited for and activated during
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boot.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>Swap files must include a [Swap] section, which
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carries information about the swap device it
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supervises. A number of options that may be used in
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this section are shared with other unit types. These
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options are documented in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
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options specific to the [Swap] section of swap units
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are the following:</para>
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<variablelist>
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<varlistentry>
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<term><varname>What=</varname></term>
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<listitem><para>Takes an absolute path
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of a device node or file to use for
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paging. See
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<citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for details. If this refers to a
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device node, a dependency on the
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respective device unit is
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automatically created. (See
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<citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.) If this refers
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to a file, a dependency on the
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respective mount unit is automatically
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created. (See
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<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more information.) This option is
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mandatory.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Priority=</varname></term>
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<listitem><para>Swap priority to use
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when activating the swap device or
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file. This takes an integer. This
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setting is optional.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>TimeoutSec=</varname></term>
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<listitem><para>Configures the time to
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wait for the swapon command to
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finish. If a command does not exit
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within the configured time the swap
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will be considered failed and be shut
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down again. All commands still running
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will be terminated forcibly via
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SIGTERM, and after another delay of
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this time with SIGKILL. (See
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<option>KillMode=</option> below.)
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Takes a unit-less value in seconds, or
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a time span value such as "5min
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20s". Pass 0 to disable the timeout
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logic. Defaults to
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90s.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KillMode=</varname></term>
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<listitem><para>Specifies how
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processes of this swap shall be
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killed. One of
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<option>control-group</option>,
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<option>process</option>,
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<option>none</option>.</para>
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<para>This option is mostly equivalent
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to the <option>KillMode=</option>
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option of service files. See
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KillSignal=</varname></term>
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<listitem><para>Specifies which signal
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to use when killing a process of this
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swap. Defaults to SIGTERM.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SendSIGKILL=</varname></term>
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<listitem><para>Specifies whether to
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send SIGKILL to remaining processes
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after a timeout, if the normal
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shutdown procedure left processes of
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the swap around. Takes a boolean
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value. Defaults to "yes".
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</para></listitem>
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</varlistentry>
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</variablelist>
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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>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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