systemd-machine-id-commit man page

systemd-machine-id-commit — Commit transient machine ID to /etc/machine-id


systemd-machine-id-commit may be used to write on disk any transient machine ID mounted as a temporary file system in /etc/machine-id at boot time. See machine-id(5) for more information about this file.

This tool will execute no operation if /etc/machine-id doesn't contain any valid machine ID, isn't mounted as an independent temporary file system, of /etc is read-only. If those conditions are met, it will then write current machine ID to disk and unmount the transient /etc/machine-id file in a race-free manner to ensure that this file is always valid for other processes.

Note that the traditional way to initialize the machine ID in /etc/machine-id is to use systemd-machine-id-setup by system installer tools. You can also use systemd-firstboot(1) to initialize the machine ID on mounted (but not booted) system images.


The following options are understood:

Takes a directory path as an argument. All paths will be prefixed with the given alternate root path, including config search paths.
-h, --help
Print a short help text and exit.
Print a short version string and exit.

Exit status

On success, 0 is returned, a non-zero failure code otherwise.

See Also

systemd(1), systemd-machine-id-commit.service(8), systemd-machine-id-setup(1), machine-id(5), systemd-firstboot(1)

Referenced By


Explore man page connections for systemd-machine-id-commit(1).