systemd-machine-id-commit.service(8) — Linux manual page

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

COLOPHON

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2024-06-13.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 257~devel                                     SYSTEM...ERVICE(8)

Pages that refer to this page: systemd-firstboot(1), systemd-machine-id-setup(1), machine-id(5), systemd.directives(7), systemd.index(7)

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