Open Stack

Hi,

In Kolla, we are having an issue with Nova's VNC / SPICE address and live
migration.  Currently, we are declaring the IP address for vncserver_listen
on each node (via ansible).  However, when a live migration is performed,
it fails due to this address not being available.

The hack is to switch the vncserver_listen to be 0.0.0.0, but this is
horribly insecure and breaks the network isolation that kolla supports.

Looking at the relevant code, this looks like it should be functional
via VIR_DOMAIN_XML_MIGRATABLE, but it doesn't seem to be working.

Could someone from Nova help us determine the cause?  We are tracking this
as bug 1596724

https://github.com/openstack/nova/blob/04cef3b5d03be3db7efab6896de867fc2cbbd03a/nova/virt/libvirt/driver.py#L5393

https://github.com/openstack/nova/blob/04cef3b5d03be3db7efab6896de867fc2cbbd03a/nova/virt/libvirt/driver.py#L5754

Thanks

--
Kind Regards,
Dave Walker
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