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The keyfile on all 3 hosts is stored in /root/keyfile, and is used to unlock the encrypted partition at boot. The {{The /etc/crypttab}} file  file is what facilitates this. The first field in the file,  {{data}} in __data__ in this case, is the name of the partition that will be given to the device-mapper. This can be seen in the above {{/etc/fstab}} entry that specifies the device location as {{as /dev/mapper/data}}. The device location in /etc/crypttab is specified by UUID since this value will remain consistent across reboots and hardware changes to the VM.


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