Snapshot Powered Off Instances

Can anyone tell me why instances have to be powered ON to create a snapshot? I ask because when reverting to a live VM snapshot, the instances are very unstable most likely due to massive clock changes.

It would be nice to shut down the instance and cut a snapshot of the dormant filesystem. I’m running Linux instances on a vCenter/ESXi hypervisor which supports this behavior.

Versions of the related components and OS (frontend, hypervisors, VMs):

  • OpenNebula 5.10.3
  • vCenter/ESXi 6.5

Steps to reproduce:

  1. Power off instance
  2. Attempt to snapshot
  3. Greyed out button in Sunstone

Expected results:

  1. Power off instance
  2. Create snapshot
  3. Boot instance
  4. Power off instance
  5. Revert to snapshot