Patch Re: [Libvir] save and restore guest

[Farkas Levente]

Daniel P. Berrange wrote:
> On Mon, Oct 08, 2007 at 04:27:00PM +0200, Farkas Levente wrote:
>> Daniel P. Berrange wrote:
>>> On Sat, Oct 06, 2007 at 02:29:39PM +0200, Farkas Levente wrote:
>>>> hi,
>>>> if i use xen with xendomain it's possible to save and restore guest
>>>> state. if i use libvirt it's not working (at least by default with kvm).
>>>> i mean if i stop or restart libvirtd all guests a stopped and even if i
>>>> restart libvirtd i've to start all guests manually. imho this's a very
>>>> essential feature. what is the reason this not working with libvirtd?:
>>>> - this feature is missing from libvirtd? or
>>> You can set KVM/QEMU guests to autostart with
>>>
>>>   virsh autostart {NAME|ID|UUID}
>> thanks, but go back to my first question. afais /etc/init.d/libvirtd
>> simple kill libvirtd, but virsh has a command save/restore. wouldn't be
>> it's much better to save guest's state on stop, restore on start in
>> stead of start if there is a saved state. i can send a patch to the
>> /etc/init.d/libvirtd, just would like to know is there any reason it's
>> not that way? anyway xendomains do it in the save way.
> 
> The save/restore capability is currently only available in the KVM-ified
> version of QEMU. We could make it try to save, and failing that destroy
> the guest. The xendomains scripts isn't a good model to emulate though.
> The autostart/kill functionality is part of the libvirt daemon itself. Any
> save/restore capability would be best integrated there

for those who like to save and restore guest at libvirtd stop and start
i attached a patch we use to for it. it's based on xen's sripts.
LIBVIRTD_AUTO_ONLY still not implemented but the sysconfig file already
contains it. if you like to set the default behavior to the current then
set LIBVIRTD_RESTORE to false.
imho it'd be useful to include in the upstream libvirtd too.

-- 
  Levente                               "Si vis pacem para bellum!"