I need some help or explanation - how disk snapshot works in OpenNebula.
I have some virtual machine and i want to make some changes here. I do disk snapshot, do some changes and if i don’t like result - i can revert without any problems and delete latest snapshot. That part is fine. But if i like new state and i want just delete/merge/consolidate snapshot - there is no option. I can’t delete because it is active. And when i want to do next changes - i got same. And i can’t delete previous snapshots because of childrens. But in this case i will have a hudge tree of snapshots which have no sense.
In documentation i found option about flat snapshots - ALLOW_ORPHANS. I did the settings and now i have flat snapshot list without parents-childrens. Now i’m able to delete snapshot in the middle, or just latest snapshot. But VM don’t boot after that. I always got error:
Mon Aug 29 13:11:48 2022: DEPLOY: error: Failed to create domain from /var/lib/one//datastores/101/42/deployment.4 error: Cannot access backing file ‘/var/lib/one//datastores/101/42/disk.0.snap/disk.0.snap/0’ of storage file ‘/var/lib/one//datastores/101/42/disk.0’ (as uid:9869, gid:9869): No such file or directory Could not create domain from /var/lib/one//datastores/101/42/deployment.4 ExitCode: 255
And i don’t found any option to merge/consolidate snaps.
What i’m doing wrong? How i can do disk snapshot, and later delete/consolidate/merge it?