9:47 a.m.
All,
Using Centos 6.4 with provided libvirt:
[root@node1 ~]# rpm -q libvirt
libvirt-1.0.1-2.el6.x86_64
Assume a VM with one or more live snapshots.
In virsh the VM snapshots can be listed.
With virsh:
- Stop and undefine this VM.
- Then define (and start) this VM.
The new VM does not have the list of snapshots.
Is there a way with virsh to rebuild the metadata such that libvirt "knows"
about the snapshots in the "disk stack"?
Harald
1:36 p.m.
On 08/27/2013 08:17 PM, Skardal, Harald wrote:
All,
Using Centos 6.4 with provided libvirt:
[root@node1 ~]# rpm -q libvirt
libvirt-1.0.1-2.el6.x86_64
Assume a VM with one or more live snapshots.
In virsh the VM snapshots can be listed.
With virsh:
- Stop and undefine this VM.
If you have snapshots, then just undefining will not work. You also have to undefine the
snapshot-metadata
If you have two snapshots named snap1, snap2 for v1, you also need to do:
$ virsh snapshot-delete --domain vm1 snap1 --metadata
$ virsh snapshot-delete --domain vm1 snap2 --metadata
NOTE - The above will only delete the libvirt snapshot metadata, but leaves the content
behind.
- Then define (and start) this VM.
Snapshot XMLs are located here (assuming you haven't deleted libvirt metadata
already):
/var/lib/libvirt/qemu/snapshot/. You can define these and try?
The new VM does not have the list of snapshots.
What is your goal? A clone of a VM with its associated snapshots?
Is there a way with virsh to rebuild the metadata such that libvirt "knows"
about the snapshots in the "disk stack"?
Defining the snapshot XMLs should make that possible.
Hope the above gives you some clues.
Harald
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--
/kashyap
8:57 p.m.
On 08/27/2013 08:47 AM, Skardal, Harald wrote:
All,
Using Centos 6.4 with provided libvirt:
[root@node1 ~]# rpm -q libvirt
libvirt-1.0.1-2.el6.x86_64
Assume a VM with one or more live snapshots.
In virsh the VM snapshots can be listed.
With virsh:
- Stop and undefine this VM.
- Then define (and start) this VM.
The new VM does not have the list of snapshots.
Is there a way with virsh to rebuild the metadata such that libvirt "knows"
about the snapshots in the "disk stack"?
If you saved off the snapshot XML ('virsh snapshot-dumpxml $dom $name'
for each name in 'virsh snapshot-list $dom', and paying attention to
which one (if any) was the current snapshot with 'virsh snapshot-current
--name $dom'), then recreating that stack can be done with 'virsh
snapshot-create --redefine $dom $file [--current]' for each file of your
saved stack.
When it comes to migrating a domain with snapshots, this process of
defining the snapshots manually on the destination then undefining them
on the source, is still the only currently supported way (as actually
migrating snapshots requires a change to the RPC protocol used to drive
migration, as it requires passing potentially large amounts of data that
will not fit in a single migration cookie).
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
3985
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3986
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2 comments
3 participants
participants (3)
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Eric Blake -
Kashyap Chamarthy -
Skardal, Harald