<div dir="ltr"><div>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.<br></div>The second change is the most problematic as you say..in any case what would be the best procedure, even if it implies downtime?<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-10-06 10:04 GMT+02:00 Barak Korren <span dir="ltr"><<a href="mailto:bkorren@redhat.com" target="_blank">bkorren@redhat.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">> Is there a clean way and possibly without downtime to change the hostname<br>
> and IP addresses of all the hosts in a running oVirt cluster?<br>
<br>
</span>As long as you don't change the VLANs and subnets for the hosts, you<br>
can change IPs by putting the hosts into maintenance one-by-one (so<br>
that VMs migrate to other hosts), removing them and re-adding with the<br>
new IPs.<br>
<br>
Hostnames (Except the engine's) should not matter for oVirt at all<br>
(you can register hosts to oVirt with names, but I wouldn't recommend<br>
that for production, as the DNS becomes a massive SPOF).<br>
<br>
If you change the subnet the hosts are attached to, and you have VMs<br>
that are using that subnet as well, you will not be able to do this<br>
without downtime, because the VMs will probably not have the right IP<br>
settings to allow them to communicate using the new subnet...<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
Barak Korren<br>
<a href="mailto:bkorren@redhat.com">bkorren@redhat.com</a><br>
RHEV-CI Team<br>
</font></span></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>Davide Ferrari<br></div>Senior Systems Engineer<br></div></div>
</div>