libvirt users - Jul 2012 - I can't virt-clone into an existing LVM now (ERROR: clone onto existing storage volume is not supported:) - i could in previous lbvirt versions? (deployment scripts no longer work...)

Hi

To deploy KVM vms I use a KVM template + script - which is cloned, then
cloned again and resized - using virt-resize.

i.e

----------------------------------------------------

virt-clone --original debian6template-DONTSTART --name NAME.test -f
/dev/vgpool/NAME.test

virsh vol-create-as vgpool NAME 8G

virt-clone --original NAME.test --name NAME -f /dev/vgpool/NAME

virt-resize --expand /dev/sda1 /dev/vgpool/NAME.test /dev/vgpool/NAME

----------------------------------------------------

The reason I clone twice is because I know that virt-clone does things to
prep it for a new install, also the whole point was to be able to specify a
size to be clone into (hence the use of virt-resize)

This worked fine on our Ubuntu 11.10 server, however in Ubuntu 12.04 when I
try to do the same I get the error

'ERROR    Clone onto existing storage volume is not supported:
'/dev/vgpool/test'

If I can't virt-clone into an existing LVM I know I can clone once - then
resize with LVM, then virt-resize into the partition (then virt-sysprep) -
however the issue with that is that it is far more fiddly to mange...

Previously could just make a 20GB partition and use virt-resize to expand
into - using the above method I would have to increase the LVM to the value
I want minus the size of the template..
i.e I have to specify - the  amount to increase by, rather than the final
size I want.... The templates also change size (when I update them, etc)
which would mean re-writting the script after every update.

Is there a way I can re-enable being able to virt-clone to an existing LVM
partition ? As mentioned it works 100% fine in Ubuntu 10.04

Regards
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[adding virt-tools-list]

On 07/11/2012 04:36 AM, Morgan Cox wrote:
> Hi
> 
> To deploy KVM vms I use a KVM template + script - which is cloned, then
> cloned again and resized - using virt-resize.
> 
> i.e
> 
> ----------------------------------------------------
> 
> virt-clone --original debian6template-DONTSTART --name NAME.test -f
> /dev/vgpool/NAME.test
> 
> virsh vol-create-as vgpool NAME 8G
> 
> virt-clone --original NAME.test --name NAME -f /dev/vgpool/NAME
> 
> virt-resize --expand /dev/sda1 /dev/vgpool/NAME.test /dev/vgpool/NAME
> 
> ----------------------------------------------------
> 
> The reason I clone twice is because I know that virt-clone does things to
> prep it for a new install, also the whole point was to be able to specify a
> size to be clone into (hence the use of virt-resize)
> 
> This worked fine on our Ubuntu 11.10 server, however in Ubuntu 12.04 when I
> try to do the same I get the error
> 
> 'ERROR    Clone onto existing storage volume is not supported:
> '/dev/vgpool/test'
virt-clone is a separate package from libvirt, I'm hoping that someone
on the virt-tools-list has more insight into whether this was an
accidental regression.
> 
> If I can't virt-clone into an existing LVM I know I can clone once -
then
> resize with LVM, then virt-resize into the partition (then virt-sysprep) -
> however the issue with that is that it is far more fiddly to mange...
> 
> Previously could just make a 20GB partition and use virt-resize to expand
> into - using the above method I would have to increase the LVM to the value
> I want minus the size of the template..
> i.e I have to specify - the  amount to increase by, rather than the final
> size I want.... The templates also change size (when I update them, etc)
> which would mean re-writting the script after every update.
> 
> Is there a way I can re-enable being able to virt-clone to an existing LVM
> partition ? As mentioned it works 100% fine in Ubuntu 10.04
> 

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



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