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5he1n avatar Server

Modifying parent snapshot in QCOW2 internal snapshots tree

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5he1n


Faced one problem and cannot find any info on the net

Let's say I have several snapshots on my VM running on .qcow2 image.

For example, it has next tree:

# virsh snapshot-list my_vm --tree
clean
  |
  +- basic
  |   |
  |   +- project_deps
  |
  +- noproxy
      |
      +- project_deps-noproxy

Where:

  • clean - freshly installed OS with updates
  • basic - clean + qemu_guest_agent + cntlm
  • project_deps - basic + project dependencies
  • noproxy - clean + qemu_guest_agent
  • project_deps-noproxy - noproxy + project dependencies

At the moment everything is just fine but one day some packages on clean snapshot will become outdated and I'll have to update it. So there is the problem. As I see, there is no option to kinda rebase snapshots on "updated clean" snapshot. I tried creating it and replacing parent snapshot in children .xml's and as expected - no result.

Sadly, I cannot use external snapshots even considering that they have requested functionality

I am glad to see any ideas on coping with that.

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