man/systemd.automount.xml

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  23
  24 <refentry id="systemd.automount">
  25   <refentryinfo>
  26     <title>systemd.automount</title>
  27     <productname>systemd</productname>
  28
  29     <authorgroup>
  30       <author>
  31         <contrib>Developer</contrib>
  32         <firstname>Lennart</firstname>
  33         <surname>Poettering</surname>
  34         <email>lennart@poettering.net</email>
  35       </author>
  36     </authorgroup>
  37   </refentryinfo>
  38
  39   <refmeta>
  40     <refentrytitle>systemd.automount</refentrytitle>
  41     <manvolnum>5</manvolnum>
  42   </refmeta>
  43
  44   <refnamediv>
  45     <refname>systemd.automount</refname>
  46     <refpurpose>Automount unit configuration</refpurpose>
  47   </refnamediv>
  48
  49   <refsynopsisdiv>
  50     <para><filename><replaceable>automount</replaceable>.automount</filename></para>
  51   </refsynopsisdiv>
  52
  53   <refsect1>
  54     <title>Description</title>
  55
  56     <para>A unit configuration file whose name ends in
  57     <literal>.automount</literal> encodes information about a file
  58     system automount point controlled and supervised by
  59     systemd.</para>
  60
  61     <para>This man page lists the configuration options specific to
  62     this unit type. See
  63     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  64     for the common options of all unit configuration files. The common
  65     configuration items are configured in the generic [Unit] and
  66     [Install] sections. The automount specific configuration options
  67     are configured in the [Automount] section.</para>
  68
  69     <para>Automount units must be named after the automount directories they control. Example: the automount point
  70     <filename noindex='true'>/home/lennart</filename> must be configured in a unit file
  71     <filename>home-lennart.automount</filename>. For details about the escaping logic used to convert a file system
  72     path to a unit name see
  73     <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Note that
  74     automount units cannot be templated, nor is it possible to add multiple names to an automount unit by creating
  75     additional symlinks to its unit file.</para>
  76
  77     <para>For each automount unit file a matching mount unit file (see
  78     <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  79     for details) must exist which is activated when the automount path
  80     is accessed. Example: if an automount unit
  81     <filename>home-lennart.automount</filename> is active and the user
  82     accesses <filename>/home/lennart</filename> the mount unit
  83     <filename>home-lennart.mount</filename> will be activated.</para>
  84
  85     <para>Automount units may be used to implement on-demand mounting
  86     as well as parallelized mounting of file systems.</para>
  87   </refsect1>
  88
  89   <refsect1>
  90     <title>Implicit Dependencies</title>
  91
  92     <para>The following dependencies are implicitly added:</para>
  93
  94     <itemizedlist>
  95       <listitem><para>If an automount unit is beneath another mount unit in the
  96       file system hierarchy, both a requirement and an ordering
  97       dependency between both units are created automatically.</para></listitem>
  98
  99       <listitem><para>An implicit <varname>Before=</varname> dependency is created
 100       between an automount unit and the mount unit it activates.</para></listitem>
 101     </itemizedlist>
 102   </refsect1>
 103
 104   <refsect1>
 105     <title>Default Dependencies</title>
 106
 107     <para>The following dependencies are added unless <varname>DefaultDependencies=no</varname> is set:</para>
 108
 109     <itemizedlist>
 110       <listitem><para>Automount units acquire automatic <varname>Before=</varname> and
 111       <varname>Conflicts=</varname> on <filename>umount.target</filename> in order to be stopped during
 112       shutdown.</para></listitem>
 113     </itemizedlist>
 114   </refsect1>
 115
 116   <refsect1>
 117     <title><filename>fstab</filename></title>
 118
 119     <para>Automount units may either be configured via unit files, or
 120     via <filename>/etc/fstab</filename> (see
 121     <citerefentry project='man-pages'><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 122     for details).</para>
 123
 124     <para>For details how systemd parses
 125     <filename>/etc/fstab</filename> see
 126     <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
 127
 128     <para>If an automount point is configured in both
 129     <filename>/etc/fstab</filename> and a unit file, the configuration
 130     in the latter takes precedence.</para>
 131   </refsect1>
 132
 133   <refsect1>
 134     <title>Options</title>
 135
 136     <para>Automount files must include an [Automount] section, which
 137     carries information about the file system automount points it
 138     supervises. The options specific to the [Automount] section of
 139     automount units are the following:</para>
 140
 141     <variablelist class='unit-directives'>
 142
 143       <varlistentry>
 144         <term><varname>Where=</varname></term>
 145         <listitem><para>Takes an absolute path of a directory of the
 146         automount point. If the automount point does not exist at time
 147         that the automount point is installed, it is created. This
 148         string must be reflected in the unit filename. (See above.)
 149         This option is mandatory.</para></listitem>
 150       </varlistentry>
 151
 152       <varlistentry>
 153         <term><varname>DirectoryMode=</varname></term>
 154         <listitem><para>Directories of automount points (and any
 155         parent directories) are automatically created if needed. This
 156         option specifies the file system access mode used when
 157         creating these directories. Takes an access mode in octal
 158         notation. Defaults to 0755.</para></listitem>
 159       </varlistentry>
 160       <varlistentry>
 161         <term><varname>TimeoutIdleSec=</varname></term>
 162         <listitem><para>Configures an idle timeout. Once the mount has been
 163         idle for the specified time, systemd will attempt to unmount. Takes a
 164         unit-less value in seconds, or a time span value such as "5min 20s".
 165         Pass 0 to disable the timeout logic. The timeout is disabled by
 166         default.</para></listitem>
 167       </varlistentry>
 168     </variablelist>
 169   </refsect1>
 170
 171   <refsect1>
 172       <title>See Also</title>
 173       <para>
 174         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 175         <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 176         <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 177         <citerefentry><refentrytitle>systemd.mount</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 178         <citerefentry project='man-pages'><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 179         <citerefentry project='die-net'><refentrytitle>automount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 180         <citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
 181       </para>
 182   </refsect1>
 183
 184 </refentry>