[ovirt-users] Change host names/IPs

Davide Ferrari davide at billymob.com
Thu Oct 6 08:27:03 UTC 2016

Well, actually I want to migrate both DNS hostnames and the subnet (from a
/24 to a /16) to which the ovirtmgr interface is connected.
The second change is the most problematic as you say..in any case what
would be the best procedure, even if it implies downtime?

2016-10-06 10:04 GMT+02:00 Barak Korren <bkorren at redhat.com>:

> > Is there a clean way and possibly without downtime to change the hostname
> > and IP addresses of all the hosts in a running oVirt cluster?
> As long as you don't change the VLANs and subnets for the hosts, you
> can change IPs by putting the hosts into maintenance one-by-one (so
> that VMs migrate to other hosts), removing them and re-adding with the
> new IPs.
> Hostnames (Except the engine's) should not matter for oVirt at all
> (you can register hosts to oVirt with names, but I wouldn't recommend
> that for production, as the DNS becomes a massive SPOF).
> If you change the subnet the hosts are attached to, and you have VMs
> that are using that subnet as well, you will not be able to do this
> without downtime, because the VMs will probably not have the right IP
> settings to allow them to communicate using the new subnet...
> --
> Barak Korren
> bkorren at redhat.com
> RHEV-CI Team

Davide Ferrari
Senior Systems Engineer
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