What is Machine ID?

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https://access.redhat.com/solutions/1551183

环境

Red Hat Enterprise Linux 7

问题

What is Machine ID?

Raw

# hostnamectl
Machine ID: f50935fd04114b6ba00d0820cddae7f1

决议

The /etc/machine-id file contains the unique machine ID of the local system that is set during installation. The machine ID is a single newline-terminated, hexadecimal, 32-character, lowercase machine ID string. When decoded from hexadecimal, this corresponds with a 16-byte/128-bit string.
The machine ID is usually generated from a random source during system installation and stays constant for all subsequent boots. Optionally, for stateless systems, it is generated during runtime at boot if it is found to be empty.
The machine ID does not change based on user configuration or when hardware is replaced. This machine ID adheres to the same format and logic as the D-Bus machine ID.
Programs may use this ID to identify the host with a globally unique ID in the network, which does not change even if the local network configuration changes. Due to this and its greater length, it is a more useful replacement for the gethostid(3) call that POSIX specifies.
The systemd-machine-id-setup(1) tool may be used by installer tools to initialize the machine ID at install time. Use systemd-firstboot(1) to initialize it on mounted (but not booted) system images.
For more details,

Raw

 # man 5 machine-id

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What is Machine ID?

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