Re: [ovirt-users] Attaching ISO to hosted engine for OS upgrade

[Chris Adams]

Once upon a time, Simone Tiraboschi  said:
> On Wed, Feb 22, 2017 at 8:04 PM, Chris Adams  wrote:
> > Also, is it normally recommended to upgrade one major release at a time?
> 
> For the engine it's not just recommended, it's mandatory!

Ahh, I didn't realize that.  I don't think I saw that in the
documentation (but maybe I just missed it?).

Thanks.
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Re: [ovirt-users] Attaching ISO to hosted engine for OS upgrade

[Simone Tiraboschi]

On Wed, Feb 22, 2017 at 8:04 PM, Chris Adams  wrote:

> Once upon a time, Simone Tiraboschi  said:
> > 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/
>
> Ahh, that looks better.  I was looking at this:
>
> https://www.ovirt.org/documentation/migration-engine-36-to-40/
>
> which just kind of glosses over how to upgrade the OS. :)
>
> I do usually use my custom CentOS install (rather than the appliance);
> is there a way to do that?
>

No, not with that flow and not in 4.1 at all.
ovirt-engine-appliance is basically just a centos VM plus ovirt-engine.
Once deployed you can tune it as you need.


>
> Also, is it normally recommended to upgrade one major release at a time?
>

For the engine it's not just recommended, it's mandatory!


> In other words, aside from the engine CentOS6->7 step, would upgrading
> from 3.5 to 4.1 need to go through 3.6 and 4.0 along the way?
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Re: [ovirt-users] Attaching ISO to hosted engine for OS upgrade

[Chris Adams]

Once upon a time, Simone Tiraboschi  said:
> 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/

Ahh, that looks better.  I was looking at this:

https://www.ovirt.org/documentation/migration-engine-36-to-40/

which just kind of glosses over how to upgrade the OS. :)

I do usually use my custom CentOS install (rather than the appliance);
is there a way to do that?

Also, is it normally recommended to upgrade one major release at a time?
In other words, aside from the engine CentOS6->7 step, would upgrading
from 3.5 to 4.1 need to go through 3.6 and 4.0 along the way?
-- 
Chris Adams 
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Re: [ovirt-users] Attaching ISO to hosted engine for OS upgrade

[Simone Tiraboschi]

On Wed, Feb 22, 2017 at 5:33 PM, Chris Adams  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/



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