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.TH "SYSTEMD\&.SWAP" "5" "" "systemd 204" "systemd.swap"
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.SH "NAME"
systemd.swap \- Swap unit configuration
.SH "SYNOPSIS"
.PP
\fIswap\fR\&.swap
.SH "DESCRIPTION"
.PP
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\&.
.PP
This man page lists the configuration options specific to this unit type\&. See
\fBsystemd.unit\fR(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\&.
.PP
Additional options are listed in
\fBsystemd.exec\fR(5), which define the execution environment the
\fBswapon\fR(8)
binary is executed in, and in
\fBsystemd.kill\fR(5)
which define the way the processes are terminated\&.
.PP
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
\fBsystemd.unit\fR(5)\&.
.PP
All swap units automatically get the appropriate dependencies on the devices or on the mount points of the files they are activated from\&.
.PP
Swap units with
\fIDefaultDependencies=\fR
enabled implicitly acquire a conflicting dependency to
umount\&.target
so that they are deactivated at shutdown\&.
.SH "FSTAB"
.PP
Swap units may either be configured via unit files, or via
/etc/fstab
(see
\fBfstab\fR(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
\fBsystemd-fstab-generator\fR(8)
for details about the conversion\&.
.PP
If a swap device or file is configured in both
/etc/fstab
and a unit file the configuration in the latter takes precedence\&.
.PP
Unless the
\fBnoauto\fR
option is set for them all swap units configured in
/etc/fstab
are also added as requirements to
swap\&.target, so that they are waited for and activated during boot\&.
.SH "OPTIONS"
.PP
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
\fBsystemd.exec\fR(5)
and
\fBsystemd.kill\fR(5)\&. The options specific to the [Swap] section of swap units are the following:
.PP
\fIWhat=\fR
.RS 4
Takes an absolute path of a device node or file to use for paging\&. See
\fBswapon\fR(8)
for details\&. If this refers to a device node, a dependency on the respective device unit is automatically created\&. (See
\fBsystemd.device\fR(5)
for more information\&.) If this refers to a file, a dependency on the respective mount unit is automatically created\&. (See
\fBsystemd.mount\fR(5)
for more information\&.) This option is mandatory\&.
.RE
.PP
\fIPriority=\fR
.RS 4
Swap priority to use when activating the swap device or file\&. This takes an integer\&. This setting is optional\&.
.RE
.PP
\fITimeoutSec=\fR
.RS 4
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
\fBKillMode=\fR
in
\fBsystemd.kill\fR(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 90s\&.
.RE
.PP
Check
\fBsystemd.exec\fR(5)
and
\fBsystemd.kill\fR(5)
for more settings\&.
.SH "SEE ALSO"
.PP

\fBsystemd\fR(1),
\fBsystemctl\fR(8),
\fBsystemd.unit\fR(5),
\fBsystemd.exec\fR(5),
\fBsystemd.kill\fR(5),
\fBsystemd.device\fR(5),
\fBsystemd.mount\fR(5),
\fBswapon\fR(8),
\fBsystemd-fstab-generator\fR(8),
\fBsystemd.directives\fR(7)