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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON |
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SYSTEM...ERVICE(8) systemd-machine-id-commit.service SYSTEM...ERVICE(8)
systemd-machine-id-commit.service - Commit a transient machine ID
to disk
systemd-machine-id-commit.service
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.
systemd(1), systemd-machine-id-setup(1), machine-id(5),
systemd-firstboot(1)
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) 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
[email protected]
systemd 258~rc2 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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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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