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312 lines
17 KiB
XML
312 lines
17 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.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>Mount unit configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename><replaceable>mount</replaceable>.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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<literal>.mount</literal> 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>,
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which define the execution environment the
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<citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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binary is executed in, and in
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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which define the way the processes are terminated, and
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in
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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which configure resource control settings for the
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processes of the service. Note that the User= and
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Group= options are not particularly useful for mount
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units specifying a <literal>Type=</literal> option or
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using configuration not specified in
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<filename>/etc/fstab</filename>;
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<citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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will refuse options that are not listed in
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<filename>/etc/fstab</filename> if it is not run as
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UID 0.</para>
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<para>Mount units must be named after the mount point
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directories they control. Example: the mount point
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<filename noindex='true'>/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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<para>If a mount point is beneath another mount point
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in the file system hierarchy, a dependency between both
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units is created automatically.</para>
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<para>Mount points created at runtime (independently of
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unit files or <filename>/etc/fstab</filename>) will be
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monitored by systemd and appear like any other mount
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unit in systemd.
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See <filename>/proc/self/mountinfo</filename> description
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in <citerefentry><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para>
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<para>Some file systems have special semantics as API
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file systems for kernel-to-userspace and
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userspace-to-userpace interfaces. Some of them may not
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be changed via mount units, and cannot be disabled.
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For a longer discussion see <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems">API
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File Systems</ulink>.</para>
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</refsect1>
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<refsect1>
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<title><filename>/etc/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). Mounts listed in
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<filename>/etc/fstab</filename> will be converted into
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native units dynamically at boot and when the
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configuration of the system manager is reloaded. In
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general, configuring mount points through
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<filename>/etc/fstab</filename> is the preferred
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approach. See
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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for details about the conversion.</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>. systemd
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will create a dependency of type
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<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>x-systemd.automount</option> is set, an
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automount unit will be created for the file
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system. See
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<citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details. If
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<option>x-systemd.device-timeout=</option> is
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specified, it may be used to configure how long systemd
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should wait for a device to show up before giving up
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on an entry from
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<filename>/etc/fstab</filename>. Specify a time in
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seconds or explicitly specify a unit as
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<literal>s</literal>, <literal>min</literal>,
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<literal>h</literal>, <literal>ms</literal>.</para>
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<para>If <option>nofail</option> is given, this mount
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will be only wanted, not required, by the
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<filename>local-fs.target</filename>. This means that
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the boot will continue even if this mount point is not
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mounted successfully. Option <option>fail</option> has
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the opposite meaning and is the default.</para>
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<para>If <option>noauto</option> is given, this mount
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will not be added as a dependency for
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<filename>local-fs.target</filename>. This means that
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it will not be mounted automatically during boot,
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unless it is pulled in by some other unit. Option
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<option>auto</option> has the opposite meaning and is
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the default.</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 that
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is stored below <filename>/usr</filename>, the former
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will take precedence. If the unit file is stored below
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<filename>/etc</filename>, it will take
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precedence. This means: native unit files take
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precedence over traditional configuration files, but
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this is superseded by the rule that configuration in
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<filename>/etc</filename> will always take precedence
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over configuration in
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<filename>/usr</filename>.</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>
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and
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<citerefentry><refentrytitle>systemd.kill</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 class='unit-directives'>
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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 does not exist at the
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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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filename. (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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file system 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
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comma-separated 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. Takes an access
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mode in octal notation. 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 command 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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<constant>SIGTERM</constant>, and after another delay of
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this time with <constant>SIGKILL</constant>. (See
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<option>KillMode=</option> in
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>.)
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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. The default value is set from the manager configuration
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file's <varname>DefaultTimeoutStart=</varname> variable.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Check
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more settings.</para>
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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.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.resource-control</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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