systemd.mount — Mount unit configuration
mount.mount
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. 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 aren't 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.
/etc/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. 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 from /etc/fstab. systemd
                will create a dependency of type
                Wants from either
                local-fs.target or
                remote-fs.target, depending
                whether the file system is local or remote. If
                x-systemd.automount is set, an
                automount unit will be created for the file
                system. See
                systemd.automount(5)
                for details. If
                x-systemd.device-timeout= 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 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.
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 file name. (See above.) This option is mandatory.
Type=¶Takes a string for the filesystem 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.
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. Defaults to
                                90s.
Check systemd.exec(5) and systemd.kill(5) for more settings.
The following option is also available in the
                [Mount] section, but exists purely
                for compatibility reasons and should not be used in
                newly written mount files.
FsckPassNo=¶The pass number for the file system checking service for this mount. See systemd.service(5) for more information on this setting.