Fix a duplicate machine-id after cloning a VPS
Two clones sharing one /etc/machine-id can fight over a DHCP lease. Regenerate it safely, and truncate it before you snapshot a golden image.
#snapshots
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VPS snapshots vs backups vs clones
A snapshot lives on your provider's infrastructure, so it is not a backup. What each one restores, and what to fix on a cloned VPS before it runs.