SYSTEMD.SWAP(5)                  systemd.swap                  SYSTEMD.SWAP(5)

       systemd.swap - Swap unit configuration


       A unit configuration file whose name ends in ".swap" encodes
       information about a swap device or file for memory paging controlled
       and supervised by systemd.

       This man page lists the configuration options specific to this unit
       type. See systemd.unit(5) for the common options of all unit
       configuration files. The common configuration items are configured in
       the generic [Unit] and [Install] sections. The swap specific
       configuration options are configured in the [Swap] section.

       Additional options are listed in systemd.exec(5), which define the
       execution environment the swapon(8) program is executed in, in
       systemd.kill(5), which define the way these processes are terminated,
       and in systemd.resource-control(5), which configure resource control
       settings for these processes of the unit.

       Swap units must be named after the devices or files they control.
       Example: the swap device /dev/sda5 must be configured in a unit file
       dev-sda5.swap. For details about the escaping logic used to convert a
       file system path to a unit name, see systemd.unit(5). Note that swap
       units cannot be templated, nor is possible to add multiple names to a
       swap unit by creating additional symlinks to it.

   Implicit Dependencies
       The following dependencies are implicitly added:

       o   All swap units automatically get the BindsTo= and After=
           dependencies on the device units or the mount units of the files
           they are activated from.

       Additional implicit dependencies may be added as result of execution
       and resource control parameters as documented in systemd.exec(5) and

   Default Dependencies
       The following dependencies are added unless DefaultDependencies=no is

       o   Swap units automatically acquire a Conflicts= and a Before=
           dependency on so that they are deactivated at
           shutdown as well as a dependency.

       Swap units may either be configured via unit files, or via /etc/fstab
       (see fstab(5) for details). Swaps listed in /etc/fstab will be
       converted into native units dynamically at boot and when the
       configuration of the system manager is reloaded. See systemd-fstab-
       generator(8) for details about the conversion.

       If a swap device or file is configured in both /etc/fstab and a unit
       file, the configuration in the latter takes precedence.

       When reading /etc/fstab, a few special options are understood by
       systemd which influence how dependencies are created for swap units.

       noauto, auto
           With noauto, the swap unit will not be added as a dependency for
  This means that it will not be activated automatically
           during boot, unless it is pulled in by some other unit. The auto
           option has the opposite meaning and is the default.

           With nofail, the swap unit will be only wanted, not required by
  This means that the boot will continue even if this
           swap device is not activated successfully.

       Swap files must include a [Swap] section, which carries information
       about the swap device it supervises. A number of options that may be
       used in this section are shared with other unit types. These options
       are documented in systemd.exec(5) and systemd.kill(5). The options
       specific to the [Swap] section of swap units are the following:

           Takes an absolute path of a device node or file to use for paging.
           See swapon(8) for details. If this refers to a device node, a
           dependency on the respective device unit is automatically created.
           (See systemd.device(5) for more information.) If this refers to a
           file, a dependency on the respective mount unit is automatically
           created. (See systemd.mount(5) for more information.) This option
           is mandatory. Note that the usual specifier expansion is applied to
           this setting, literal percent characters should hence be written as

           Swap priority to use when activating the swap device or file. This
           takes an integer. This setting is optional and ignored when the
           priority is set by pri= in the Options= key.

           May contain an option string for the swap device. This may be used
           for controlling discard options among other functionality, if the
           swap backing device supports the discard or trim operation. (See
           swapon(8) for more information.) Note that the usual specifier
           expansion is applied to this setting, literal percent characters
           should hence be written as "%%".

           Configures the time to wait for the swapon command to finish. If a
           command does not exit within the configured time, the swap will be
           considered failed and be shut down again. All commands still
           running will be terminated forcibly via SIGTERM, and after another
           delay of this time with SIGKILL. (See KillMode= in
           systemd.kill(5).) Takes a unit-less value in seconds, or a time
           span value such as "5min 20s". Pass "0" to disable the timeout
           logic. Defaults to DefaultTimeoutStartSec= from the manager
           configuration file (see systemd-system.conf(5)).

       Check systemd.exec(5) and systemd.kill(5) for more settings.

       systemd(1), systemctl(1), systemd.unit(5), systemd.exec(5),
       systemd.kill(5), systemd.resource-control(5), systemd.device(5),
       systemd.mount(5), swapon(8), systemd-fstab-generator(8),

systemd 239                                                    SYSTEMD.SWAP(5)

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