NAME
systemd-machine-id-setup - Initialize the machine ID in /etc/machine-idSYNOPSIS
systemd-machine-id-setup
DESCRIPTION
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.
OPTIONS
The following options are understood: --root=pathTakes 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.
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.SEE ALSO
systemd(1), machine-id(5), systemd-machine-id-commit.service(8), dbus-uuidgen(1), systemd-firstboot(1)NOTES
- 1.
- Container Interface
systemd 252 |