[libvirt-users] about guest live migration configuration changes persistence ..

[Jean-Pierre Ribeauville]

Hi,

Thanks for infos.

My concern is the following :

In order to establish datas exchanges between hosts and guest , I'll add a channel device to a running Guest ( as I learned from you  that it's  possible to do that without stopping the Guest).
When the guest migrates to another host , this one must be able to retrieve the channel device parameters to be able to dialog with the migrated guest.
I plan to use dumpxml to retrieve these  infos.
Will these infos be updated on the second host where  the guest has migrated ?

Thx.

J.P.

-----Message d'origine-----
De : Michal Privoznik [mailto:mprivozn at redhat.com] 
Envoyé : mercredi 2 septembre 2015 14:12
À : Jean-Pierre Ribeauville; libvirt-users at redhat.com
Objet : Re: [libvirt-users] about guest live migration configuration changes persistence ..

On 31.08.2015 09:27, Jean-Pierre Ribeauville wrote:
> Hi,
> 
> 
> Is a change , by edit it via virsh edit  , in the "local" .xml 
> configuration file (i.e. adding a channel device)  persistent when live migrating the guest on another host ?

Yes. Since the 0.9.7 release, the configuration XML is transferred to the other side too. However, by default, migrated domains are just transient (unless you pass VIR_MIGRATE_PERSIST_DEST flag, or virsh migrate --persistent ..) so the configuration XML doesn't have much effect in that case.

Michal