man/systemd.mount.xml

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   9   Copyright 2010 Lennart Poettering
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  24
  25 <refentry id="systemd.mount">
  26         <refentryinfo>
  27                 <title>systemd.mount</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Lennart</firstname>
  34                                 <surname>Poettering</surname>
  35                                 <email>lennart@poettering.net</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemd.mount</refentrytitle>
  42                 <manvolnum>5</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd.mount</refname>
  47                 <refpurpose>systemd mount configuration files</refpurpose>
  48         </refnamediv>
  49
  50         <refsynopsisdiv>
  51                 <para><filename>systemd.mount</filename></para>
  52         </refsynopsisdiv>
  53
  54         <refsect1>
  55                 <title>Description</title>
  56
  57                 <para>A unit configuration file whose name ends in
  58                 <filename>.mount</filename> encodes information about
  59                 a file system mount point controlled and supervised by
  60                 systemd.</para>
  61
  62                 <para>This man page lists the configuration options
  63                 specific to this unit type. See
  64                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
  65                 for the common options of all unit configuration
  66                 files. The common configuration items are configured
  67                 in the generic [Unit] and [Install] sections. The
  68                 mount specific configuration options are configured
  69                 in the [Mount] section.</para>
  70
  71                 <para>Additional options are listed in
  72                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
  73                 which define the execution environment the
  74                 <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
  75                 binary is executed in.</para>
  76
  77                 <para>Mount units must be named after the mount point
  78                 directories they control. Example: the mount point
  79                 <filename>/home/lennart</filename> must be configured
  80                 in a unit file
  81                 <filename>home-lennart.mount</filename>. For details
  82                 about the escaping logic used to convert a file system
  83                 path to a unit name see
  84                 <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
  85
  86                 <para>Optionally, a mount unit may be accompanied by
  87                 an automount unit, to allow on-demand or parallelized
  88                 mounting. See
  89                 <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
  90
  91                 <para>If an mount point is beneath another mount point
  92                 in the file system hierarchy, a dependency between both
  93                 units is created automatically.</para>
  94
  95                 <para>Mount points created at runtime independent on
  96                 unit files or <filename>/etc/fstab</filename> will be
  97                 monitored by systemd and appear like any other mount
  98                 unit in systemd.</para>
  99         </refsect1>
 100
 101         <refsect1>
 102                 <title><filename>/etc/fstab</filename></title>
 103
 104                 <para>Mount units may either be configured via unit
 105                 files, or via <filename>/etc/fstab</filename> (see
 106                 <citerefentry><refentrytitle>fstab</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 107                 for details).</para>
 108
 109                 <para>When reading <filename>/etc/fstab</filename> a
 110                 few special mount options are understood by systemd
 111                 which influence how dependencies are created for mount
 112                 points from <filename>/etc/fstab</filename>. systemd
 113                 will create a dependency of type
 114                 <option>Wants</option> from either
 115                 <filename>local-fs.target</filename> or
 116                 <filename>remote-fs.target</filename>, depending
 117                 whether the file system is local or remote. If
 118                 <option>x-systemd.automount</option> is set, an
 119                 automount unit will be created for the file
 120                 system. See
 121                 <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 122                 for details. If
 123                 <option>x-systemd.device-timeout=</option> is
 124                 specified it may be used to configure how long systemd
 125                 should wait for a device to show up before giving up
 126                 on an entry from
 127                 <filename>/etc/fstab</filename>. Specify a time in
 128                 seconds or explicitly specifiy a unit as
 129                 <literal>s</literal>, <literal>min</literal>,
 130                 <literal>h</literal>, <literal>ms</literal>.</para>
 131
 132                 <para>If a mount point is configured in both
 133                 <filename>/etc/fstab</filename> and a unit file, the
 134                 configuration in the latter takes precedence.</para>
 135         </refsect1>
 136
 137         <refsect1>
 138                 <title>Options</title>
 139
 140                 <para>Mount files must include a [Mount] section,
 141                 which carries information about the file system mount points it
 142                 supervises. A number of options that may be used in
 143                 this section are shared with other unit types. These
 144                 options are documented in
 145                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
 146                 options specific to the [Mount] section of mount
 147                 units are the following:</para>
 148
 149                 <variablelist>
 150
 151                         <varlistentry>
 152                                 <term><varname>What=</varname></term>
 153                                 <listitem><para>Takes an absolute path
 154                                 of a device node, file or other
 155                                 resource to mount. See
 156                                 <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 157                                 for details. If this refers to a
 158                                 device node, a dependency on the
 159                                 respective device unit is
 160                                 automatically created. (See
 161                                 <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information.)
 162                                 This option is
 163                                 mandatory.</para></listitem>
 164                         </varlistentry>
 165
 166                         <varlistentry>
 167                                 <term><varname>Where=</varname></term>
 168                                 <listitem><para>Takes an absolute path
 169                                 of a directory of the mount point. If
 170                                 the mount point is not existing at
 171                                 time of mounting, it is created. This
 172                                 string must be reflected in the unit
 173                                 file name. (See above.) This option is
 174                                 mandatory.</para></listitem>
 175                         </varlistentry>
 176
 177                         <varlistentry>
 178                                 <term><varname>Type=</varname></term>
 179                                 <listitem><para>Takes a string for the
 180                                 filesystem type. See
 181                                 <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 182                                 for details. This setting is
 183                                 optional.</para></listitem>
 184                         </varlistentry>
 185
 186                         <varlistentry>
 187                                 <term><varname>Options=</varname></term>
 188
 189                                 <listitem><para>Mount options to use
 190                                 when mounting. This takes a comma
 191                                 separated list of options. This
 192                                 setting is optional.</para></listitem>
 193                         </varlistentry>
 194
 195                         <varlistentry>
 196                                 <term><varname>DirectoryMode=</varname></term>
 197                                 <listitem><para>Directories of mount
 198                                 points (and any parent directories)
 199                                 are automatically created if
 200                                 needed. This option specifies the file
 201                                 system access mode used when creating
 202                                 these directories. Takes an access
 203                                 mode in octal notation. Defaults to
 204                                 0755.</para></listitem>
 205                         </varlistentry>
 206
 207                         <varlistentry>
 208                                 <term><varname>TimeoutSec=</varname></term>
 209                                 <listitem><para>Configures the time to
 210                                 wait for the mount command to
 211                                 finish. If a command does not exit
 212                                 within the configured time the mount
 213                                 will be considered failed and be shut
 214                                 down again. All commands still running
 215                                 will be terminated forcibly via
 216                                 SIGTERM, and after another delay of
 217                                 this time with SIGKILL. (See
 218                                 <option>KillMode=</option> below.)
 219                                 Takes a unit-less value in seconds, or
 220                                 a time span value such as "5min
 221                                 20s". Pass 0 to disable the timeout
 222                                 logic. Defaults to
 223                                 90s.</para></listitem>
 224                         </varlistentry>
 225
 226                         <varlistentry>
 227                                 <term><varname>KillMode=</varname></term>
 228                                 <listitem><para>Specifies how
 229                                 processes of this mount shall be
 230                                 killed. One of
 231                                 <option>control-group</option>,
 232                                 <option>process</option>,
 233                                 <option>none</option>.</para>
 234
 235                                 <para>This option is mostly equivalent
 236                                 to the <option>KillMode=</option>
 237                                 option of service files. See
 238                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 239                                 for details.</para></listitem>
 240                         </varlistentry>
 241
 242                         <varlistentry>
 243                                 <term><varname>KillSignal=</varname></term>
 244                                 <listitem><para>Specifies which signal
 245                                 to use when killing a process of this
 246                                 mount. Defaults to SIGTERM.
 247                                 </para></listitem>
 248                         </varlistentry>
 249
 250                         <varlistentry>
 251                                 <term><varname>SendSIGKILL=</varname></term>
 252                                 <listitem><para>Specifies whether to
 253                                 send SIGKILL to remaining processes
 254                                 after a timeout, if the normal
 255                                 shutdown procedure left processes of
 256                                 the mount around. Takes a boolean
 257                                 value. Defaults to "yes".
 258                                 </para></listitem>
 259                         </varlistentry>
 260
 261                         <varlistentry>
 262                                 <term><varname>FsckPassNo=</varname></term>
 263
 264                                 <listitem><para>The pass number for
 265                                 the file system checking service for
 266                                 this mount. See
 267                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 268                                 for more information on this setting.
 269                                 </para></listitem>
 270                         </varlistentry>
 271
 272                 </variablelist>
 273         </refsect1>
 274
 275         <refsect1>
 276                   <title>See Also</title>
 277                   <para>
 278                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 279                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 280                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 281                           <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 282                           <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 283                           <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 284                           <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 285                   </para>
 286         </refsect1>
 287
 288 </refentry>