Re: [libvirt-users] recovering from deleted snapshot
On Fri, Jun 30, 2017 at 12:05:47 +0200, Peter Krempa wrote:
On Thu, Jun 22, 2017 at 11:02:41 -0400, Doug Hughes wrote:
[...]
> virsh blockcommit $vm $DISK --active --pivot
>
> Normally this works fine, though something went wrong on the 20th.
> something happened to make the blockcommit fail, but the -snap file got
> deleted (note to self - check return code from blockcommit command!)
>
> So now I'm in a state. The domain i still running. but it's running off
> the -snapshot that is in the xml. I googled around for how to recover a
> blockcommit from a deleted snapshot, but didn't find anything. (pointers
> welcome)
In fact, it's way simpler. If libvirt still knows about the overlay
image (this is necessary only so that it can say the proper things to
qemu) you can re-do the block commit:
$ virsh list
Id Name State
----------------------------------------------------
3 fedora23 running
$ virsh snapshot-create-as --disk-only --no-metadata fedora23
Domain snapshot 1498817916 created
$ virsh domblklist fedora23
Target Source
------------------------------------------------
vda /var/lib/libvirt/images/fedora23.1498817916
hda -
$ rm /var/lib/libvirt/images/fedora23.1498817916
$ ls /var/lib/libvirt/images/fedora23.1498817916
ls: cannot access '/var/lib/libvirt/images/fedora23.1498817916': No such file or
directory
$ virsh blockcommit --active --pivot fedora23 vda
Successfully pivoted
$ virsh domblklist fedora23
Target Source
------------------------------------------------
vda /var/lib/libvirt/images/fedora23.qcow2
hda -
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