[ovirt-users] Updating nodes

[Gabi C]

Hello!

>From my experience, updating my setup - 3 nodes + 1 engine ESXi VM; all F19
ovirt 3.2 -> 3.3 -.3.4 and now 3.4.1 with all 3 nodes acting also as
gluster replicated nodes - you may also run into gluster issues -
compatibility between different gluster version, slit-brain etc.  -
client&server when you apply gluster updates


On Mon, May 12, 2014 at 9:47 AM, Itamar Heim <iheim at redhat.com> wrote:

> On 05/12/2014 12:43 AM, Paul Heinlein wrote:
>
>> On Sun, 11 May 2014, Itamar Heim wrote:
>>
>>   I just inherited an oVirt cluster at work that's running 3.2 on
>>>>  Fedora 18 and would dearly love some direction about updating
>>>>  things without a system-wide downtime.
>>>>
>>>
>>> 1. no downtime should happen, as you can upgrade hosts by moving
>>>    them to maintenance, which will live migrate VMs running on them.
>>>
>>> 2. fedora 18 is EOL, so 'yum update' isn't going to help here.
>>>
>>> 3. re-install host should refresh vdsm and its dependent packages if
>>>    the repo's configured have newer versions. when the host is in
>>>    maint, you can simply run 'yum update' on the host, then
>>>    re-activate it (of course reboot if kernel got updated, etc.)
>>>
>>
>> I've followed those steps, and I can get VMs migrated *to* the updated
>> nodes. I have two worries:
>>
>>   1. VMs migrated to the updated nodes cannot be migrated back to the
>>      old nodes. So once I start, it's all-in or nothing. Is that to be
>>      expected?
>>
>
> on fedora hosts this can happen, since there is no live migration
> compatibility between fedora versions.
> on .el6 hosts this shouldn't happen[1]
>
>
>
>>   2. Once all the nodes are backed up, is there a fairly sure-fire way
>>      to update the master engine? Is that documented somewhere?
>>
>
> a. you should be able to upgrade engine or hosts regardless of each
>    other.
> b. the setup (upgrade) script takes a db backup just in case. if you
>    happen to run it in a VM, snapshot/backing it up doesn't hurt as
>    well.
> c. if upgrading to a new minor version, note to change in the upgraded
>    engine the cluster and DC level to benefit from new features.
>
>
>
>> Thanks!
>>
>>
> [1] there is a known caveat is you have selinux disabled on some machines
> and enabled on others.
>
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