NAME

       systemd-machine-id-commit.service - Commit a transient machine ID to disk

SYNOPSIS

       systemd-machine-id-commit.service

DESCRIPTION

       systemd-machine-id-commit.service is an early boot service responsible for committing transient
       /etc/machine-id files to a writable disk file system. See machine-id(5) for more information about
       machine IDs.

       This service is started after local-fs.target in case /etc/machine-id is a mount point of its own
       (usually from a memory file system such as "tmpfs") and /etc is writable. The service will invoke
       systemd-machine-id-setup --commit, which writes the current transient machine ID to disk and unmount the
       /etc/machine-id file in a race-free manner to ensure that file is always valid and accessible for other
       processes. See systemd-machine-id-setup(1) for details.

       The main use case of this service are systems where /etc/machine-id is read-only and initially not
       initialized. In this case, the system manager will generate a transient machine ID file on a memory file
       system, and mount it over /etc/machine-id, during the early boot phase. This service is then invoked in a
       later boot phase, as soon as /etc/ has been remounted writable and the ID may thus be committed to disk
       to make it permanent.

SEE ALSO

       systemd(1), systemd-machine-id-setup(1), machine-id(5), systemd-firstboot(1)