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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.
279 lines
14 KiB
XML
279 lines
14 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>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>,
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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.</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>/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 an 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 independent on
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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.</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).</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>MountAuto=yes</option> is set in
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<filename>system.conf</filename> (which is the
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default), or if <option>x-systemd.mount</option> is
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specified as mount option, then systemd will create a
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dependency of 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>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 specifiy 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 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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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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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 mount 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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mount. 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 mount 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>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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