systemd.mountsystemdDeveloperLennartPoetteringlennart@poettering.netsystemd.mount5systemd.mountMount unit configurationmount.mountDescriptionA 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.unit5
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.exec5,
which define the execution environment the
mount8
binary is executed in, and in
systemd.kill5,
which define the way the processes are terminated, and
in
systemd.resource-control5,
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;
mount8
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.unit5.Optionally, a mount unit may be accompanied by
an automount unit, to allow on-demand or parallelized
mounting. See
systemd.automount5.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 proc5.
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.<filename>/etc/fstab</filename>Mount units may either be configured via unit
files, or via /etc/fstab (see
fstab5
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-generator8
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 from /etc/fstab. systemd
will create a dependency of type
from either
local-fs.target or
remote-fs.target, depending
whether the file system is local or remote. If
is set, an
automount unit will be created for the file
system. See
systemd.automount5
for details. If
is
specified, it may be used to 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 specify a unit as
s, min,
h, ms.If is given, this mount
will be only wanted, not required, by the
local-fs.target. This means that
the boot will continue even if this mount point is not
mounted successfully. Option has
the opposite meaning and is the default.If is given, this mount
will not be added as a dependency for
local-fs.target. This means that
it will not be mounted automatically during boot,
unless it is pulled in by some other unit. Option
has the opposite meaning and is
the default.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.OptionsMount 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.exec5
and
systemd.kill5. 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
mount8
for details. If this refers to a
device node, a dependency on the
respective device unit is
automatically created. (See
systemd.device5 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
mount8
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
mount8's
-s
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
in
systemd.kill5.)
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.exec5
and
systemd.kill5
for more settings.See Alsosystemd1,
systemctl8,
systemd.unit5,
systemd.exec5,
systemd.kill5,
systemd.resource-control5,
systemd.service5,
systemd.device5,
proc5,
mount8,
systemd-fstab-generator8,
systemd.directives7