Machine Guid/Uuid that is unique to each operating system that never changes?

black3dynamite

Salt uses your computer hostname as the minion id but that can be annoying if you ever end up changing your hostname after. You would end up having to change the minion id and on the salt master, you will need to accept the new minion id and remove the old minion id. You could create a script that makes the changes to the minion id file, restart the service and have salt master automatically accept the new minion and remove the old minion. If you were to use a unique Guid or UUID as the minion id then you can avoid this.

From a Windows systems, which value is unique that never changes?

# This won't change unless you reinstall
Get-ItemProperty -Path Registry::HKLM\SOFTWARE\Microsoft\Cryptography | Select-Object -ExpandProperty MachineGuid

OR

# Both command shows the same the UUID value
Get-WmiObject -Class Win32_ComputerSystemProduct | Select-Object -ExpandProperty UUID

- OR -

(Get-CimInstance -Class Win32_ComputerSystemProduct).UUID

From a Linux systems, which value is unique that never changes?

# This won't change unless you reinstall or use the systemd-machine-id-setup command
cat /etc/machine-id

OR

# Both command shows the same the UUID value
sudo dmidecode -s system-uuid

- OR -

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