On Wed, Feb 22, 2017 at 5:33 PM, Chris Adams <cma@cmadams.net> wrote:

I'm working on upgrading an oVirt 3.5 setup. The physical hosts are
running CentOS 7, but the hosted engine is CentOS 6. The upgrade notes
are "back up the engine, upgrade/reinstall the OS, then restore", but I
can't see how to actually install CentOS 7 on the engine.

Am I supposed to re-run "hosted-engine --deploy"? Wouldn't that try to
re-register the physical hosts, or can I interrupt it to restore the
backup?

Or, is there a way to just attach an install ISO to the engine VM and
boot from that?

On 3.6 we release the engine also for el6 so for 3.5/el6 to 3.6/el6 you have just to:

- set global maintenance mode,

- add the 3.6 repo to the engine VM,

- run yum update ovirt-*-setup* on the engine VM

- run engine-setup

- upgrade the host to 3.6 setting maintenance mode one host at a time

- raise the cluster compatibility level

Then ee have a specific helper utility for 3.6/el6 -> 4.0/el7:

https://www.ovirt.org/develop/release-management/features/hosted-engine-migration-to-4-0/

--
Chris Adams <cma@cmadams.net>
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