[one-users] VM in unknown state never gets updated

[Ruben S. Montero]

Yes, I think it'd do. Let's try to fix this for OpenNebula 4.0,
http://dev.opennebula.org/issues/1687

Cheers

Ruben

On Fri, Dec 7, 2012 at 12:52 AM, Gary S. Cuozzo <gary at isgsoftware.net> wrote:
> I suppose exiting with 0 would work.  It would be nice though to be able to know the outcome of the post-migrate.  In my case it means that I have either NFS mounts or iSCSI connections to clean up manually.  Would a compromise work where the script can return a non-zero exit code but ONE would still view the migration as "successful" because the failure happened after the actual hypervisor migration step?
>
> ----- Original Message -----
> From: "Ruben S. Montero" <rsmontero at opennebula.org>
> To: "Gary S. Cuozzo" <gary at isgsoftware.net>
> Cc: users at lists.opennebula.org
> Sent: Thursday, December 6, 2012 2:09:46 PM
> Subject: Re: [one-users] VM in unknown state never gets updated
>
> Hi
>
> I think this is the expected behavior, the problem here is the drivers
> "lying" to OpenNebula. This what happens:
>
> 1.- Users issue a live migration. The live migration fails (driver exits 1)
> 2.- OpenNebula detects a failed migration and assumes the VM is
> RUNNING in the original host
> 3.- OpenNebula polls the VM and it can find it, so it move it to the
> unknown state
> 4.- OpenNebula keeps polling the VM and looking for it in the initial host
>
> There is no way for OpenNebula to know that the VM has leaved the
> host. Probably the only way is changing 2, and assume that the live
> migration succeeded. However in a normal (failure) situation when the
> hypervisor fails the live-migration the VM keeps running in the
> original host.
>
> So what happens if post-migrate fail? I'd say that given that the VM
> is running on the new host it does not make sense to rollback the
> operation and I think we should always exit 0 the post-migrate
> script...
>
> What do you think?
>
> Ruben
>
>
> On Thu, Dec 6, 2012 at 4:19 AM, Gary S. Cuozzo <gary at isgsoftware.net> wrote:
>> As a note, I manually migrated the VM back to the original host and ONE did
>> pick up on it and put it back to the running state so that I can manage it
>> again.  I think it would be good though if ONE could find it on any host and
>> not just the host it originally ran on.
>> gary
>>
>> ________________________________
>> From: "Gary S. Cuozzo" <gary at isgsoftware.net>
>> To: users at lists.opennebula.org
>> Sent: Wednesday, December 5, 2012 10:04:34 PM
>> Subject: [one-users] VM in unknown state never gets updated
>>
>>
>> Hello,
>> I'm testing my TM driver and using the pre/postmigrate scripts in 3.8.1.
>> Due to a bug in the postmigrate script, I have a VM that successfully
>> migrated from one host to the other, but since the postmigrate returned
>> non-zero status, the migration was considered to be failed by ONE and the VM
>> was put into the UNKOWN state.  I figured ONE would eventually poll the
>> hosts and realize that the VM was running and update the state of the VM as
>> well as the host it's running on.  It never picked up on it though.
>>
>> It seems like ONE should be able to recover from this since it should be
>> able to poll the hosts and find out that it is running on one of them.  Is
>> there some way to tell ONE to update the state?  Or tell it to scan for it?
>>
>> Since it's just a test VM I can just delete & recreate it, but I think this
>> is a use case that ONE should be able to handle.
>>
>> Any thoughts?
>>
>> Cheers,
>> gary
>>
>>
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>>
>>
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>
>
>
> --
> Ruben S. Montero, PhD
> Project co-Lead and Chief Architect
> OpenNebula - The Open Source Solution for Data Center Virtualization
> www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula



-- 
Ruben S. Montero, PhD
Project co-Lead and Chief Architect
OpenNebula - The Open Source Solution for Data Center Virtualization
www.OpenNebula.org | rsmontero at opennebula.org | @OpenNebula