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