Hi, ----- 2016. júl.. 14., 10:09, Yedidyah Bar David didi@redhat.com írta:
On Thu, Jul 14, 2016 at 10:38 AM, Demeter Tibor <tdemeter@itsmart.hu> wrote:
Dear members!
We have an ovirt cluster that based on el6 and 3.5.6 It is contain three nodes, but the first node is an all-in-one installation. I would like to upgrade the whole system to 4.0. Also I would like to switch to hosted engine modell.
Sounds like a combination of:
[1] http://www.ovirt.org/develop/developer-guide/engine/migrate-to-hosted-engine... [2] https://www.ovirt.org/documentation/how-to/hosted-engine-host-OS-upgrade/ [3] https://www.ovirt.org/documentation/how-to/hosted-engine/#upgrade-hosted-eng...
Now, we bought new servers for the migration.
"For the migration", meaning you intend to eventually migrate to them? And decommission the existing ones?
:) No, it was an old plan. So we bought them because we want to switch to ultra-dense multipurpose servers from individual servers.
Also, I assume you want el7 on all hosts eventually.
Storage remains as-is?
The storage is NFS based storgae.
How important is no downtime for the VMs?
We could makes downtime if that needed.
What is the good way to migrate nodes, etc?
Something like: 1. Create new storage space for the hosted-engine 2. Install el7 on one of the new hosts, NH1 3. deploy hosted-engine on NH1
Have I add the old IP to this engine? Because it same with the node. Also, I would like to switch to VLANs with the migration, if possible. I don't know when I need to make this, after or under the migration process..
Follow [1]: - backup existing engine and stop/disable engine there - restore backup on the engine vm (after you install engine, but do not engine-setup) - engine-setup - When 'hosted-engine --deploy' will try to add the host to the engine, it might fail, because it will add it to Default cluster, which has el6 hosts. Check [2] about this - create new cluster and add there. - All of the above in 3.5.
How can I install 3.5 and not 4.0 from repositories?
4. Perhaps add the other new hosts, perhaps as hosted-engine hosts - if you want HA for the engine vm 5. Migrate all VMs to the new cluster. 6. Delete old hosts 7. Upgrade to 3.6 - check [2] 8. Upgrade to 4.0 - should be normal procedure [3]
I recommend testing this on test systems prior to prod. You can use nested kvm for this.
Best, -- Didi
Thank you Tibor