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 <[email protected]>: > > 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 > [email protected] > RHEV-CI Team > -- Davide Ferrari Senior Systems Engineer
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