每台機器都會有一些自己唯一的 id

在開發程式中，可能會有需要用來分辨機器

machine-id

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$ cat /etc/machine-id

$ cat /var/lib/dbus/machine-id

product_uuid

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$ sudo cat /sys/class/dmi/id/product_uuid

MAC address

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$ ip link

Hard Disk UUID

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$ blkid

$ ls -l /dev/disk/by-uuid

random UUID

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$ cat /proc/sys/kernel/random/uuid

$ uuidgen

Reference

https://www.thegeekdiary.com/centos-rhel-7-how-to-change-the-machine-id/ http://0pointer.de/blog/projects/ids.html https://liquidat.wordpress.com/2013/03/13/uuids-and-linux-everything-you-ever-need-to-know/