libvirt users - Jun 2010 - Snapshots - can't take a snapshot with running VM

Hi

I'm quite new to KVM/libvirt0 so hope you can help

I'm using Ubuntu Lucid 10.04 and libvirt0 0.8.1

When I try a :-

snapshot create vm_name

I get an error, ie 'error -5 while writing'

Googling doesnt bring anything up. Taking snapshots of a vm when it isnt 
running works fine.

Can I really only create snapshots of a vm when it isnt running ?

-- 
Kind regards

Julian

On 06/15/10 - 01:11:53PM, Julian Robbins wrote:
> Hi
> 
> I'm quite new to KVM/libvirt0 so hope you can help
> 
> I'm using Ubuntu Lucid 10.04 and libvirt0 0.8.1
> 
> When I try a :-
> 
> snapshot create vm_name
> 
> I get an error, ie 'error -5 while writing'
> 
> Googling doesnt bring anything up. Taking snapshots of a vm when it
> isnt running works fine.
> 
> Can I really only create snapshots of a vm when it isnt running ?
No, you should be able to take a snapshot both while it is running and
while it is off.  However, they use different mechanisms so there could be
a bug in the online version.  What version of qemu/kvm are you running?
Also, do you have apparmor enabled/running?  If so, and if the apparmor policy
hasn't been updated, that might be the source of your problems.

--
Chris Lalancette

> >  Can I really only create snapshots of a vm when it isnt running ?
>
> No, you should be able to take a snapshot both while it is running and
> while it is off.  However, they use different mechanisms so there could be
> a bug in the online version.  What version of qemu/kvm are you running?
> Also, do you have apparmor enabled/running?  If so, and if the apparmor
policy
> hasn't been updated, that might be the source of your problems.
>    
Thanks for your reply. Oddly, I didnt receive an email to me, but only 
in the archives !

I've disabled AppArmor for now and it works fine, so there is some 
unwanted issue there. Strangely, looking again apparmor is still enabled 
when guest is running after reboot. Possibly rebooting the guest and 
using dynamic appamor instead of static has helped ?

I'm using vers 1.84 of QEMU/Kvm from dnjl's PPA for Lucid.

-- 
Kind regards

Julian