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Live backups create-snapshot-as and memspec



Hi all!

I've been using libvirt for some time and until now I have treated backups of virtual computers as if they where physical computers installing the backup client on the guest. I am now however facing the need to backup a couple a couple of guest at the host level so I've been trying to catch up by reading, googling and by trial and error too. Up to now I've been able to backup a live machine whith a command like the following

virsh snapshot-create-as --domain test --name backup --atomic --diskspec vda,snapshot=external --disk-only

This command creates a file test.backup and in the meantime I can backup the original test.qcow2 but for what I saw this disk image is in a "dirty" state, as if the machine I could restore from this file had been turned off whithout a proper shutdown.

I know that I can later restore the machine to its original state by issuing a command like this

virsh blockcommit --domain test vda --active --pivot
virsh snapshot-delete test --metadata backup

I have seen that it is possible to create the snapshot using a memspec parameter which would make the backup of the guest as if it where in a clean state, however I haven't found the equivalent of the blockcommit for the memory file, in a sort of speak, to be able to restore the guest to it's original state.

Thank you very much!
Best regards.
David Wells.


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