[ovirt-users] PLEASE HELP - oVirt 4.0.5 Instability + Best way to rollback to 4.0.4

[Pavel Zhukov]

Hello oVirt Padawan,
You can install new engine machine and import existing storage domains
there.
https://www.ovirt.org/develop/release-management/features/storage/importstoragedomain/
Please read restrictions and limitations.
I think it's more safe way to go in such kind of situations.

On Wed, Jan 4, 2017 at 6:40 PM, Rogério Ceni Coelho <
rogeriocenicoelho at gmail.com> wrote:

> Hi oVirt ObiWan´s,
>
> Today i try to rollback 4.0.5 to 4.0.4 because some instability with the
> following method and i crash on a problem. :-(
>
> I shutdown oVirt Engine and make checkpoint on Engine VM ( Runs on
> Hyper-V, don´t ask me way ... ). Rollback vm checkpoint to point in time
> before 4.0.5 update process and power up ovirt engine vm. Everything ok
> but, six virtual machines that i create before this point in time does not
> exist on oVirt Engine Database and all came with external-VMNAME and i can
> not do nothing on them. I really think (only in my dreams ) that when ovirt
> engine goes up and talk with ovirt nodes, all new vm will be automatically
> discovered again. The worst thing are that i use SAN Storage Domain and
> oVirt use LVM to storage VM disks, so i don´t know how to find vm disks
> that ovirt engine does not recognize (external-VMNAME).
>
> After all that, i rollback again to 4.0.5 and every vm are ok now again,
> but i want to test this rollback process to 4.0.4 and do this on Production.
>
> I think the right steps are :
>
> 1. Run engine-backup  /bin/engine-backup --mode=backup --scope=all
> --file=/root/ovirt/`hostname`.`date +%d%m%Y.%H%M%S`.ovirt-engine.bkp
> --log=/tmp/ovirt-engine_backup.log
> 2. Shutdown ovirt engine vm.
> 3. Make new checkpoint to rollback with something goes wrong
> 4. Rollback to checkpoint witch 4.0.4
> 5. Restore engine-backup (from version 4.0.5)
> 6. Start everything and check if all are ok
>
> This is the right way to rollback from one sub release to another ( 4.0.5
> to 4.0.4 ) ???
> This checkpoints/snapshots of ovirt-engine VM are the best way to rollback
> in time ???
>
> Thanks in advance.
>
>
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>


-- 
Pavel Zhukov
Software Engineer
RHEV Devops
IRC: landgraf
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