# phpman > man > systemd-machine-id-commit.service(8)

SYSTEMD-MACHINE-ID-COMMIT.SERVICE(**sy**stemd-machine-id-commit.serv**SYS**[TEMD-MACHINE-ID-COMMIT.SERVICE(8)](https://www.chedong.com/phpMan.php/man/TEMD-MACHINE-ID-COMMIT.SERVICE/8/markdown)



## 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)](https://www.chedong.com/phpMan.php/man/machine-id/5/markdown) 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)](https://www.chedong.com/phpMan.php/man/systemd-machine-id-setup/1/markdown) 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)](https://www.chedong.com/phpMan.php/man/systemd/1/markdown), [**systemd-machine-id-setup**(1)](https://www.chedong.com/phpMan.php/man/systemd-machine-id-setup/1/markdown), [**machine-id**(5)](https://www.chedong.com/phpMan.php/man/machine-id/5/markdown), [**systemd-firstboot**(1)](https://www.chedong.com/phpMan.php/man/systemd-firstboot/1/markdown)



systemd 249                                                     [SYSTEMD-MACHINE-ID-COMMIT.SERVICE(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-MACHINE-ID-COMMIT.SERVICE/8/markdown)