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
rootpath, including config search paths.
- -h, --help
- Print a short help text and exit.
- Print a short version string and exit.
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), systemd-machine-id-commit.service(8), systemd-machine-id-setup(1), machine-id(5), systemd-firstboot(1)
Explore man page connections for systemd-machine-id-commit(1).