mirror of
https://github.com/systemd/systemd.git
synced 2024-11-02 19:21:53 +03:00
223 lines
11 KiB
XML
223 lines
11 KiB
XML
<?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 General Public License as published by
|
|
the Free Software Foundation; either version 2 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
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU 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>systemd swap configuration files</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>Swap units must be named after the devices
|
|
(resp. 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 (resp. 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).</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>. 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> below.)
|
|
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>
|
|
|
|
<varlistentry>
|
|
<term><varname>KillMode=</varname></term>
|
|
<listitem><para>Specifies how
|
|
processes of this swap shall be
|
|
killed. One of
|
|
<option>control-group</option>,
|
|
<option>process</option>,
|
|
<option>none</option>.</para>
|
|
|
|
<para>This option is mostly equivalent
|
|
to the <option>KillMode=</option>
|
|
option of service files. See
|
|
<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
|
for details.</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>KillSignal=</varname></term>
|
|
<listitem><para>Specifies which signal
|
|
to use when killing a process of this
|
|
swap. Defaults to SIGTERM.
|
|
</para></listitem>
|
|
</varlistentry>
|
|
|
|
<varlistentry>
|
|
<term><varname>SendSIGKILL=</varname></term>
|
|
<listitem><para>Specifies whether to
|
|
send SIGKILL to remaining processes
|
|
after a timeout, if the normal
|
|
shutdown procedure left processes of
|
|
the swap around. Takes a boolean
|
|
value. Defaults to "yes".
|
|
</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</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.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>swapon</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|