[ovirt-users] Upgrade from CentOS 6.8 (oVirt 3.5) to CentOS 7 (oVirt 4.0)

[Simone Tiraboschi]

On Mon, Aug 29, 2016 at 2:11 PM, Nir Soffer <nsoffer at redhat.com> wrote:
> On Mon, Aug 29, 2016 at 3:06 PM, Fedele Stabile
> <fedele.stabile at fis.unical.it> wrote:
>> my ultimate goal would be to have a cluster with last version of Centos
>> and oVirt,
>> so my question is
>> what are the best steps:
>> first upgrade Centos of first upgrade oVirt?
>
> You cannot upgrade ovirt on centos 6, since 3.5 is the last version
> supporting it.
>
> Best would be to upgrade the hypervisors to centos 7, which will
> pull latest ovirt anyway.
>
>> The ovirt-engine is hosted
>
> Upgrading the hosted engine vm is not related and more delicate,
> It should be possible using hosted engine setup.
>
> Adding Simone to add more info on that.

On 4.0 we have a new --upgrade-appliance feature on hosted-engine-setup:
 https://www.ovirt.org/develop/release-management/features/hosted-engine-migration-to-4-0/

The tool will ask you to take a backup pf your engine DB with
engine-backup, then the tool will re-deploy a 4.0/el7 appliance
automatically injecting there the backup of your 3.6 engine.
The supported path is 3.6 -> 4.0 so you have also to do 3.5 -> 3.6 before that.



>> Fedele
>>
>> Il giorno lun, 29/08/2016 alle 13.44 +0200, Fedele Stabile ha scritto:
>>> ok,
>>> I understand you suggest to upgrade centos 6.8 to 7.2 first
>>> Correct?
>
> I misread your question - you seems to already run centos 6.8.
>
> I guess you are not using block storage (iSCSI/FC), do you?
>
> Nir
>
>>>
>>> Il giorno lun, 29/08/2016 alle 14.38 +0300, Nir Soffer ha scritto:
>>> >
>>> > On Mon, Aug 29, 2016 at 2:15 PM, Fedele Stabile
>>> > <fedele.stabile at fis.unical.it> wrote:
>>> > >
>>> > >
>>> > > I would upgrade my CentOS 6.8 to 7 on my cluster of 5 ovirt nodes
>>> > > (actually I'm running oVirt 3.5 and glusterfs 3.7).
>>> > > Anyone has experienced troubles for this upgrade?
>>> >
>>> > Udev in 6.8 seems to be broken, breaking block storage.
>>> > See https://access.redhat.com/solutions/2576511
>>> >
>>> > I would avoid this upgrade, or test it on one hypervisor and report
>>> > ovirt bug.
>>> >
>>> > Upgrading to 3.6 or 4.0 and centos 7.2 is recommended.
>>> >
>>> > Nir
>>> >
>>>
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>>