libvirt users - Jan 2015 - virsh snapshot-create persistent through destroy(undefine)

Hi,

If i take a snapshot of a qcow2 image backed domain via virsh
snapshot-create domainID and I shutdown the machine (and probably destroy
the domain if virsh list still shows it running), and then undeinfed the
domain  will that snapshot still exist and be active when I define and
start the domain back up?

---
Thanks,
Yitao(依涛 姜)
jiangyt.github.io

Sorry , here is my environments

[root@localhost snapshot]# qemu-img | grep version
qemu-img version 0.12.1, Copyright (c) 2004-2008 Fabrice Bellard
       for qemu-img to create a sparse image during conversion
[root@localhost snapshot]# libvirtd --version
libvirtd (libvirt) 0.10.2


---
Thanks,
Yitao(依涛 姜)
jiangyt.github.io

On Tue, Jan 27, 2015 at 6:10 PM, Yitao Jiang <willierjyt@gmail.com> wrote:
> Hi,
>
> If i take a snapshot of a qcow2 image backed domain via virsh
> snapshot-create domainID and I shutdown the machine (and probably destroy
> the domain if virsh list still shows it running), and then undeinfed the
> domain  will that snapshot still exist and be active when I define and
> start the domain back up?
>
> ---
> Thanks,
> Yitao(依涛 姜)
> jiangyt.github.io
>

On 01/27/2015 03:10 AM, Yitao Jiang wrote:
> Hi,
> 
> If i take a snapshot of a qcow2 image backed domain via virsh
> snapshot-create domainID and I shutdown the machine (and probably destroy
> the domain if virsh list still shows it running), and then undeinfed the
> domain  will that snapshot still exist and be active when I define and
> start the domain back up?
Shutdown/destroy does not lose track of snapshot information.  Undefine
does; but it only loses track of the metadata; the snapshot data still
exists, and you could re-create it with virsh snapshot-create --redefine
after the domain is redefined, if you want to still revert to that state.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

Hi,Eric

Thank you very much for the information
On Jan 28, 2015 1:51 AM, "Eric Blake" <eblake@redhat.com> wrote:
> On 01/27/2015 03:10 AM, Yitao Jiang wrote:
> > Hi,
> >
> > If i take a snapshot of a qcow2 image backed domain via virsh
> > snapshot-create domainID and I shutdown the machine (and probably
destroy
> > the domain if virsh list still shows it running), and then undeinfed
the
> > domain  will that snapshot still exist and be active when I define and
> > start the domain back up?
>
> Shutdown/destroy does not lose track of snapshot information.  Undefine
> does; but it only loses track of the metadata; the snapshot data still
> exists, and you could re-create it with virsh snapshot-create --redefine
> after the domain is redefined, if you want to still revert to that state.
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>