2010-07-02 05:29:15 +07:00
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<?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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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.mount">
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<refentryinfo>
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<title>systemd.mount</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.mount</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.mount</refname>
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<refpurpose>systemd mount configuration files</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd.mount</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>.mount</filename> encodes information about
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a file system mount point controlled and supervised by
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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
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mount specific configuration options are configured
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in the [Mount] section.</para>
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<para>Additional options are listed in
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
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<para>Mount units must be named after the file paths
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they reflect. Example: the mount point
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<filename>/home/lennart</filename> must be configured
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in a unit file
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<filename>home-lennart.mount</filename>. For details
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about the escaping logic used to convert a file system
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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>Optionally, a mount unit may be accompanied by
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an automount unit, to allow on-demand or parallelized
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mounting. See
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<citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</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>Mount 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>When reading <filename>/etc/fstab</filename> a
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few special mount options are understood by systemd
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which influence how dependencies are created for mount
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points from <filename>/etc/fstab</filename>. If
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<option>comment=systemd.mount</option> is specified as
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mount option then systemd will create a dependency of
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type <option>Wants</option> from either
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<filename>local-fs.target</filename> or
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<filename>remote-fs.target</filename>, depending
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whether the file system is local or remote. If
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<option>comment=systemd.automount</option> is set, an
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automount unit will be created for the file system. See
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<citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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<para>If a mount point 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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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>Mount files must include a [Mount] section,
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which carries information about the file system mount points 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 [Mount] section of mount
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units 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, file or other
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resource to mount. See
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<citerefentry><refentrytitle>mount</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> for more information.)
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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>Where=</varname></term>
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<listitem><para>Takes an absolute path
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of a directory of the mount point. If
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the mount point is not existing at
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time of mounting it is created. This
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string must be reflected in the unit
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file name. (See above.) 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>Type=</varname></term>
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<listitem><para>Takes a string for the
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filesystem type. See
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<citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for details. This setting is
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optional.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Options=</varname></term>
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<listitem><para>Mount options to use
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when mounting. This takes a comma
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seperated list of options. 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>DirectoryMode=</varname></term>
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<listitem><para>Directories of mount
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points (and any parent directories)
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are automatically created if
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needed. This option specifies the file
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system access mode used when creating
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these directories. Defaults to
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0755.</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 mount command to
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finish. If a comand does not exit
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within the configured time the mount
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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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60s.</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 mount shall be
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killed. One of
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<option>control-group</option>,
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<option>process-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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</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>8</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>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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