systemd.mount — Mount unit configuration
A unit configuration file whose name ends in
.mount" encodes information about a file system
mount point 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 mount specific configuration options are configured in the [Mount] section.
Additional options are listed in
which define the execution environment the
binary is executed in, and in
which define the way the processes are terminated, and in
which configure resource control settings for the processes of the
service. Note that the User= and Group= options are not
particularly useful for mount units specifying a
Type=" option or using configuration not
will refuse options that are not listed in
/etc/fstab if it is not run as UID 0.
Mount units must be named after the mount point directories they control. Example: the mount point
/home/lennart must be configured in a unit file
For details about the escaping logic used to convert a file system path to a unit name, see
systemd.unit(5). Note that mount
units cannot be templated, nor is possible to add multiple names to a mount unit by creating additional symlinks to
Optionally, a mount unit may be accompanied by an automount unit, to allow on-demand or parallelized mounting. See systemd.automount(5).
Mount points created at runtime (independently of unit files
/etc/fstab) will be monitored by systemd
and appear like any other mount unit in systemd. See
/proc/self/mountinfo description in
Some file systems have special semantics as API file systems for kernel-to-userspace and userspace-to-userspace interfaces. Some of them may not be changed via mount units, and cannot be disabled. For a longer discussion see API File Systems.
If a mount unit is beneath another mount unit in the file system hierarchy, both a requirement dependency and an ordering dependency between both units are created automatically.
Block device backed file systems automatically gain
dependencies on the device unit encapsulating the block
device (see below).
If traditional file system quota is enabled for a mount
Before= dependencies on
quotaon.service are added.
For mount units with
DefaultDependencies=yes in the "
[Unit]" section (the
default) a couple additional dependencies are added. Mount units referring to local file systems automatically gain
After= dependency on
local-fs-pre.target. Network mount units
After= dependencies on
network-online.target. Towards the latter a
Wants= unit is added as well. Mount units referring to local and network file systems are
distinguished by their file system type specification. In some cases this is not sufficient (for example network
block device based mounts, such as iSCSI), in which case
_netdev may be added to the mount option
string of the unit, which forces systemd to consider the mount unit a network mount. Mount units (regardless if
local or network) also acquire automatic
umount.target in order to be stopped during shutdown.
Mount units may either be configured via unit files, or via
for details). Mounts listed in
will be converted into native units dynamically at boot and when
the configuration of the system manager is reloaded. In general,
configuring mount points through
is the preferred approach. See
for details about the conversion.
The NFS mount option
bg for NFS background mounts
as documented in nfs(5)
is not supported in
/etc/fstab entries. The systemd mount option
provides similar functionality and should be used instead.
/etc/fstab a few special
mount options are understood by systemd which influence how
dependencies are created for mount points. systemd will create a
dependency of type
Requires (see option
below), from either
remote-fs.target, depending whether the file
system is local or remote.
After= dependency between the created
mount unit and another systemd unit, such as a device or mount
unit. The argument should be a unit name, or an absolute path
to a device node or mount point. This option may be specified
more than once. This option is particularly useful for mount
point declarations that need an additional device to be around
(such as an external journal device for journal file systems)
or an additional mount to be in place (such as an overlay file
system that merges multiple mount points). See
RequiresMountsFor= dependency between the
created mount unit and other mount units. The argument must be
an absolute path. This option may be specified more than once.
An automount unit will be created for the file system. See systemd.automount(5) for details.
Configures the idle timeout of the
automount unit. See
Configure how long systemd should wait for a
device to show up before giving up on an entry from
/etc/fstab. Specify a time in seconds or
explicitly append a unit such as "
Note that this option can only be used in
/etc/fstab, and will be
ignored when part of the
setting in a unit file.
noauto, this mount will
not be added as a dependency for
remote-fs.target. This means that it will
not be mounted automatically during boot, unless it is pulled
in by some other unit. The
auto option has the
opposite meaning and is the default.
nofail, this mount will
be only wanted, not required, by
remote-fs.target. This means that the
boot will continue even if this mount point is not mounted
An additional filesystem to be mounted in the
If a mount point is configured in both
/etc/fstab and a unit file that is stored
/usr, the former will take precedence.
If the unit file is stored below
will take precedence. This means: native unit files take
precedence over traditional configuration files, but this is
superseded by the rule that configuration in
/etc will always take precedence over
Mount files must include a [Mount] section, which carries information about the file system mount points 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 [Mount] section of mount units are the following:
Takes an absolute path of a device node, file or other resource to mount. See mount(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.) This option is mandatory.
Takes an absolute path of a directory of the mount point. If the mount point does not exist at the time of mounting, it is created. This string must be reflected in the unit filename. (See above.) This option is mandatory.
Takes a string for the file system type. See mount(8) for details. This setting is optional.
Mount options to use when mounting. This takes a comma-separated list of options. This setting is optional.
Takes a boolean argument. If true, parsing of
the options specified in
relaxed, and unknown mount options are tolerated. This
-s switch. Defaults to
Directories of mount points (and any parent directories) are automatically created if needed. This option specifies the file system access mode used when creating these directories. Takes an access mode in octal notation. Defaults to 0755.
Configures the time to wait for the mount
command to finish. If a command does not exit within the
configured time, the mount will be considered failed and be
shut down again. All commands still running will be terminated
SIGTERM, and after another
delay of this time with
Takes a unit-less value in seconds, or a time span value such
as "5min 20s". Pass 0 to disable the timeout logic. The
default value is set from the manager configuration file's