Re: [ovirt-users] Change host names/IPs
On 6 October 2016 at 11:27, Davide Ferrari <davide(a)billymob.com> wrote:
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?
Something like the following (I'm assuming you have multiple hosts...):
1. Put host in to maintenance mode
2. Remove it from oVirt
3. Change host network settings
4. Re-attach host with new setting to oVirt
5. Migrate some VMs to the new host and fix their IP settings
6. Repeat for other hosts
Things to note:
- If you are using hosted-engine, it will further complicate things for you,
I'm not sure if and how can one change the H.E. IP.
- If you are using an IP-based storage that is accessed via the same subnet,
you need to ensure it is still accessible with the same name/IP from the
new subnet.
If you are only making this change so you can run more VMs, you can
consider adding the new subnet as a new VLAN/physical LAN to the
existing hosts, and keep using old /24 subnet for ovirtmgmt. It is a
good idea to separate ovirtmgmt traffic from other traffic anyway...
--
Barak Korren
bkorren(a)redhat.com
RHEV-CI Team