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CentOS 7.0 - man page for systemd-machine-id-setup (centos section 1)

SYSTEMD-MACHINE-ID-SETUP(1)				     systemd-machine-id-setup				       SYSTEMD-MACHINE-ID-SETUP(1)

systemd-machine-id-setup - Initialize the machine ID in /etc/machine-id
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 randomly generated ID. See machine-id(5) for more information about this file. This tool will execute no operation if /etc/machine-id is already initialized. 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. If run inside a KVM virtual machine and a UUID is passed via the -uuid option, this UUID is used to initialize the machine ID instead of a randomly generated one. The caller must ensure that the UUID passed is sufficiently unique and is different for every booted instanced of the VM. Similarly, if run inside a Linux container environment and a UUID is set for the container this is used to initialize the machine ID. For details see the documentation of the Container Interface[1].
The following options are understood: -h, --help Prints a short help text and exits. --version Prints a short version string and exits.
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), machine-id(5), dbus-uuidgen(1)
1. Container Interface systemd 208 SYSTEMD-MACHINE-ID-SETUP(1)