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systemd-machine-id-setup

 3 years ago
source link: https://www.freedesktop.org/software/systemd/man/systemd-machine-id-setup.html
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Synopsis

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 machined 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.

  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.


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