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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | SEE ALSO | NOTES | COLOPHON |
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SYSTEMD-MACHINE-ID-SETUP(1)temd-machine-id-setupTEMD-MACHINE-ID-SETUP(1)
systemd-machine-id-setup - Initialize the machine ID in
/etc/machine-id
systemd-machine-id-setup
systemd-machine-id-setup may be used by system installer tools to
initialize the machine ID stored in /etc/machine-id at install
time, with a provisioned or randomly generated ID. See
machine-id(5) for more information about this file.
If the tool is invoked without the --commit switch,
/etc/machine-id is initialized with a valid, new machine ID if it
is missing or empty. The new machine ID will be acquired in the
following fashion:
1. If a valid D-Bus machine ID is already configured for the
system, the D-Bus machine ID is copied and used to initialize
the machine ID in /etc/machine-id.
2. If run inside a KVM virtual machine and a UUID is configured
(via the -uuid option), this UUID is used to initialize the
machine ID. The caller must ensure that the UUID passed is
sufficiently unique and is different for every booted
instance of the VM.
3. Similarly, if run inside a Linux container environment and a
UUID is configured for the container, this is used to
initialize the machine ID. For details, see the documentation
of the Container Interface[1].
4. Otherwise, a new ID is randomly generated.
The --commit switch may be used to commit a transient machined ID
to disk, making it persistent. For details, see below.
Use systemd-firstboot(1) to initialize the machine ID on mounted
(but not booted) system images.
The following options are understood:
--root=path
Takes a directory path as argument. All paths operated on
will be prefixed with the given alternate root path,
including the path for /etc/machine-id itself.
--image=path
Takes a path to a device node or regular file as argument.
This is similar to --root= as described above, but operates
on a disk image instead of a directory tree.
--commit
Commit a transient machine ID to disk. This command may be
used to convert a transient machine ID into a persistent one.
A transient machine ID file is one that was bind mounted from
a memory file system (usually "tmpfs") to /etc/machine-id
during the early phase of the boot process. This may happen
because /etc/ is initially read-only and was missing a valid
machine ID file at that point.
This command will execute no operation if /etc/machine-id is
not mounted from a memory file system, or if /etc/ is
read-only. The command will write the current transient
machine ID to disk and unmount the /etc/machine-id mount
point in a race-free manner to ensure that this file is
always valid and accessible for other processes.
This command is primarily used by the
systemd-machine-id-commit.service(8) early boot service.
--print
Print the machine ID generated or committed after the
operation is complete.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), machine-id(5), systemd-machine-id-commit.service(8),
dbus-uuidgen(1), systemd-firstboot(1)
1. Container Interface
https://systemd.io/CONTAINER_INTERFACE
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 2022-12-17. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-16.) 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 252 SYSTEMD-MACHINE-ID-SETUP(1)
Pages that refer to this page: systemd-firstboot(1), machine-id(5), lvmsystemid(7), systemd.directives(7), systemd.index(7), systemd-machine-id-commit.service(8)
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HTML rendering created 2022-12-18 by Michael Kerrisk, author of The Linux Programming Interface, maintainer of the Linux man-pages project. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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