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). Mounts listed in
 108                 <filename>/etc/fstab</filename> will be converted into
 109                 native units dynamically at boot and when the
 110                 configuration of the system manager is reloaded. See
 111                 <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 112                 for details about the conversion.</para>
 113
 114                 <para>When reading <filename>/etc/fstab</filename> a
 115                 few special mount options are understood by systemd
 116                 which influence how dependencies are created for mount
 117                 points from <filename>/etc/fstab</filename>. systemd
 118                 will create a dependency of type
 119                 <option>Wants</option> from either
 120                 <filename>local-fs.target</filename> or
 121                 <filename>remote-fs.target</filename>, depending
 122                 whether the file system is local or remote. If
 123                 <option>x-systemd.automount</option> is set, an
 124                 automount unit will be created for the file
 125                 system. See
 126                 <citerefentry><refentrytitle>systemd.automount</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 127                 for details. If
 128                 <option>x-systemd.device-timeout=</option> is
 129                 specified it may be used to configure how long systemd
 130                 should wait for a device to show up before giving up
 131                 on an entry from
 132                 <filename>/etc/fstab</filename>. Specify a time in
 133                 seconds or explicitly specifiy a unit as
 134                 <literal>s</literal>, <literal>min</literal>,
 135                 <literal>h</literal>, <literal>ms</literal>.</para>
 136
 137                 <para>If a mount point is configured in both
 138                 <filename>/etc/fstab</filename> and a unit file, the
 139                 configuration in the latter takes precedence.</para>
 140         </refsect1>
 141
 142         <refsect1>
 143                 <title>Options</title>
 144
 145                 <para>Mount files must include a [Mount] section,
 146                 which carries information about the file system mount points it
 147                 supervises. A number of options that may be used in
 148                 this section are shared with other unit types. These
 149                 options are documented in
 150                 <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
 151                 options specific to the [Mount] section of mount
 152                 units are the following:</para>
 153
 154                 <variablelist>
 155
 156                         <varlistentry>
 157                                 <term><varname>What=</varname></term>
 158                                 <listitem><para>Takes an absolute path
 159                                 of a device node, file or other
 160                                 resource to mount. See
 161                                 <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 162                                 for details. If this refers to a
 163                                 device node, a dependency on the
 164                                 respective device unit is
 165                                 automatically created. (See
 166                                 <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information.)
 167                                 This option is
 168                                 mandatory.</para></listitem>
 169                         </varlistentry>
 170
 171                         <varlistentry>
 172                                 <term><varname>Where=</varname></term>
 173                                 <listitem><para>Takes an absolute path
 174                                 of a directory of the mount point. If
 175                                 the mount point is not existing at
 176                                 time of mounting, it is created. This
 177                                 string must be reflected in the unit
 178                                 file name. (See above.) This option is
 179                                 mandatory.</para></listitem>
 180                         </varlistentry>
 181
 182                         <varlistentry>
 183                                 <term><varname>Type=</varname></term>
 184                                 <listitem><para>Takes a string for the
 185                                 filesystem type. See
 186                                 <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 187                                 for details. This setting is
 188                                 optional.</para></listitem>
 189                         </varlistentry>
 190
 191                         <varlistentry>
 192                                 <term><varname>Options=</varname></term>
 193
 194                                 <listitem><para>Mount options to use
 195                                 when mounting. This takes a comma
 196                                 separated list of options. This
 197                                 setting is optional.</para></listitem>
 198                         </varlistentry>
 199
 200                         <varlistentry>
 201                                 <term><varname>DirectoryMode=</varname></term>
 202                                 <listitem><para>Directories of mount
 203                                 points (and any parent directories)
 204                                 are automatically created if
 205                                 needed. This option specifies the file
 206                                 system access mode used when creating
 207                                 these directories. Takes an access
 208                                 mode in octal notation. Defaults to
 209                                 0755.</para></listitem>
 210                         </varlistentry>
 211
 212                         <varlistentry>
 213                                 <term><varname>TimeoutSec=</varname></term>
 214                                 <listitem><para>Configures the time to
 215                                 wait for the mount command to
 216                                 finish. If a command does not exit
 217                                 within the configured time the mount
 218                                 will be considered failed and be shut
 219                                 down again. All commands still running
 220                                 will be terminated forcibly via
 221                                 SIGTERM, and after another delay of
 222                                 this time with SIGKILL. (See
 223                                 <option>KillMode=</option> below.)
 224                                 Takes a unit-less value in seconds, or
 225                                 a time span value such as "5min
 226                                 20s". Pass 0 to disable the timeout
 227                                 logic. Defaults to
 228                                 90s.</para></listitem>
 229                         </varlistentry>
 230
 231                         <varlistentry>
 232                                 <term><varname>KillMode=</varname></term>
 233                                 <listitem><para>Specifies how
 234                                 processes of this mount shall be
 235                                 killed. One of
 236                                 <option>control-group</option>,
 237                                 <option>process</option>,
 238                                 <option>none</option>.</para>
 239
 240                                 <para>This option is mostly equivalent
 241                                 to the <option>KillMode=</option>
 242                                 option of service files. See
 243                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 244                                 for details.</para></listitem>
 245                         </varlistentry>
 246
 247                         <varlistentry>
 248                                 <term><varname>KillSignal=</varname></term>
 249                                 <listitem><para>Specifies which signal
 250                                 to use when killing a process of this
 251                                 mount. Defaults to SIGTERM.
 252                                 </para></listitem>
 253                         </varlistentry>
 254
 255                         <varlistentry>
 256                                 <term><varname>SendSIGKILL=</varname></term>
 257                                 <listitem><para>Specifies whether to
 258                                 send SIGKILL to remaining processes
 259                                 after a timeout, if the normal
 260                                 shutdown procedure left processes of
 261                                 the mount around. Takes a boolean
 262                                 value. Defaults to "yes".
 263                                 </para></listitem>
 264                         </varlistentry>
 265
 266                 </variablelist>
 267         </refsect1>
 268
 269         <refsect1>
 270                 <title>Compatibility Options</title>
 271
 272                 <para>The following option is also available in the
 273                 <literal>[Mount]</literal> section, but exists purely
 274                 for compatibility reasons and should not be used in
 275                 newly written mount files.</para>
 276
 277                 <variablelist>
 278                         <varlistentry>
 279                                 <term><varname>FsckPassNo=</varname></term>
 280
 281                                 <listitem><para>The pass number for
 282                                 the file system checking service for
 283                                 this mount. See
 284                                 <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
 285                                 for more information on this setting.
 286                                 </para></listitem>
 287                         </varlistentry>
 288                 </variablelist>
 289         </refsect1>
 290
 291         <refsect1>
 292                   <title>See Also</title>
 293                   <para>
 294                           <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 295                           <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 296                           <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 297                           <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 298                           <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 299                           <citerefentry><refentrytitle>systemd.device</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
 300                           <citerefentry><refentrytitle>mount</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
 301                           <citerefentry><refentrytitle>systemd-fstab-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 302                   </para>
 303         </refsect1>
 304
 305 </refentry>