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SYSTEMD.MOUNT(5) systemd.mount SYSTEMD.MOUNT(5)
NAME
systemd.mount - Mount unit configuration
SYNOPSIS
mount.mount
DESCRIPTION
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 systemd.exec(5), which define the execution environment
the mount(8) binary is executed in, and in systemd.kill(5), which define the way the
processes are terminated, and in systemd.resource-control(5), 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 specified in /etc/fstab; mount(8) 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 home-lennart.mount. For
details about the escaping logic used to convert a file system path to a unit name, see
systemd.unit(5).
Optionally, a mount unit may be accompanied by an automount unit, to allow on-demand or
parallelized mounting. See systemd.automount(5).
If a mount point is beneath another mount point in the file system hierarchy, a dependency
between both units is created automatically.
Mount points created at runtime (independently of unit files or /etc/fstab) will be
monitored by systemd and appear like any other mount unit in systemd. See
/proc/self/mountinfo description in proc(5).
Some file systems have special semantics as API file systems for kernel-to-userspace and
userspace-to-userpace interfaces. Some of them may not be changed via mount units, and
cannot be disabled. For a longer discussion see API File Systems[1].
FSTAB
Mount units may either be configured via unit files, or via /etc/fstab (see fstab(5) for
details). Mounts listed in /etc/fstab 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 /etc/fstab is the preferred approach. See systemd-fstab-generator(8)
for details about the conversion.
When reading /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 Wants or Requires (see option nofail below), from either local-fs.target or
remote-fs.target, depending whether the file system is local or remote.
x-systemd.requires=
Configures a Requires= and an 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 After= and Requires= in
systemd.unit(5) for details.
x-systemd.requires-mounts-for=
Configures a 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. See RequiresMountsFor= in systemd.unit(5) for details.
x-systemd.automount
An automount unit will be created for the file system. See systemd.automount(5) for
details.
x-systemd.idle-timeout=
Configures the idleness timeout of the automount unit. See TimeoutIdleSec= in
systemd.automount(5) for details.
x-systemd.device-timeout=
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 as "s",
"min", "h", "ms".
Note that this option can only be used in /etc/fstab, and will be ignored when part of
Options= setting in a unit file.
_netdev
Normally the file system type is used to determine if a mount is a "network mount",
i.e. if it should only be started after the network is available. Using this option
overrides this detection and specifies that the mount requires network.
Network mount units are ordered between remote-fs-pre.target and remote-fs.target,
instead of local-fs-pre.target and local-fs.target. They also pull in
network-online.target and are ordered after it and network.target.
noauto, auto
With noauto, this mount will not be added as a dependency for local-fs.target or
remote-fs.target. This means that it will not be mounted automatically during boot,
unless it is pulled in by some other unit. Option auto has the opposite meaning and is
the default.
nofail
With nofail this mount will be only wanted, not required, by local-fs.target or
remote-fs.target. This means that the boot will continue even if this mount point is
not mounted successfully.
x-initrd.mount
An additional filesystem to be mounted in the initramfs. See initrd-fs.target
description in systemd.special(7).
If a mount point is configured in both /etc/fstab and a unit file that is stored below
/usr, the former will take precedence. If the unit file is stored below /etc, it 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 configuration in /usr.
OPTIONS
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:
What=
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.
Where=
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.
Type=
Takes a string for the file system type. See mount(8) for details. This setting is
optional.
Options=
Mount options to use when mounting. This takes a comma-separated list of options. This
setting is optional.
SloppyOptions=
Takes a boolean argument. If true, parsing of the options specified in Options= is
relaxed, and unknown mount options are tolerated. This corresponds with mount(8)'s -s
switch. Defaults to off.
LazyUnmount=
Takes a boolean argument. If true, detach the filesystem from the filesystem hierarchy
at time of the unmount operation, and clean up all references to the filesystem as
soon as they are not busy anymore. This corresponds with umount(8)'s -l switch.
Defaults to off.
DirectoryMode=
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.
TimeoutSec=
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 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. The default value is set from the manager configuration file's
DefaultTimeoutStart= variable.
Check systemd.exec(5) and systemd.kill(5) for more settings.
SEE ALSO
systemd(1), systemctl(1), systemd.unit(5), systemd.exec(5), systemd.kill(5),
systemd.resource-control(5), systemd.service(5), systemd.device(5), proc(5), mount(8),
systemd-fstab-generator(8), systemd.directives(7)
NOTES
1. API File Systems
http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
systemd 219 SYSTEMD.MOUNT(5)
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