systemd-machine-id-commit.service(8)

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)

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