Hi, Effectively, I use unix socket as backend. Thx for help. J.P. -----Message d'origine----- De : Michal Privoznik [mailto:mprivozn@redhat.com] Envoyé : jeudi 3 septembre 2015 11:33 À : Jean-Pierre Ribeauville; libvirt-users@redhat.com Objet : Re: [libvirt-users] about guest live migration configuration changes persistence .. On 03.09.2015 11:18, Jean-Pierre Ribeauville wrote:
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 ?
Sure. Otherwise migration would be broken in general. I mean, if guest uses say tap0 on the source, the device may already have been taken on the destination. Libvirt must then find/create another free device for the migrated domain to use, e.g. tap1. It's the same with other devices. Even consoles. But if you're using channel device (assuming you're using a unix socket as backend (=part visible within the host)), the path to the socket should be preserved. Michal