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