Comment 0 for bug 1758034

As live migration is now tunnelled over ssh (by default), the fqdn of the target (e.g overcloud-novacompute-0.example.com) must exist in /etc/hosts and resolve to the internal api network address.

If CloudDomain has not been set correctly on initial deployment (to match DNS/DHCP etc...) then the /etc/hosts entries will default to localdomain and live-migration will fail.

However altering ClouldDomain after initial deployment is known to cause issues (e.g with galera).

Until the issues with altering CloudDomain have been resolved I suggest we backport https://review.openstack.org/521928. The would allow additional entries to be appended to /etc/hosts to workaround the issue.