[one-users] VM running on multiple hosts

[Tino Vazquez]

Hi,

Issues with delete and shutdown have been greatly improved in
OpenNebula 4.4+, I would recommend upgrading as far as possible.

Best,

-Tino

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Constantino Vázquez Blanco, PhD, MSc
Senior Infrastructure Architect at C12G Labs
www.c12g.com | @C12G | es.linkedin.com/in/tinova

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On 26 June 2014 16:42, Steven Timm <timm at fnal.gov> wrote:
> We have also seen this behavior in OpenNebula 3.2.
> It appears that the failure mode occurs because the onevm delete
> (or shutdown or migrate) doesn't correctly verify that the virtual machine
> has gone away.
> It sends the acpi terminate signal to the virtual machine
> but if that fails, the VM will keep running.  There is no
> signal sent to libvirt to kill the machine regardless.
> OpenNebula
> deletes the disk.0 from underneath it but that doesn't stop
> the vm from running, it stays running on the deleted file handle.
>
> On the plus side, I once was able to recover the full disk image
> of a VM that shouldn't have been deleted, that way, by going
> to the /proc file system and dd'ing from the still-open file
> handle of the process.
>
> We've written a set of utilities to check the consistency
> of the leases database with what is actually running on the cloud,
> and alert us if there are any differences.
>
> Steve Timm
>
>
>
> On Thu, 26 Jun 2014, Milos Kozak wrote:
>
>> Hi, I would like to add that I have experienced it few times with ONE
>> 3.8..
>>
>> On 6/26/2014 9:34 AM, Robert Tanase wrote:
>>>
>>>      Hi all,
>>>
>>>      We are using Opennebula 4.2 system with several hosts ( KVM +
>>>      network storage) .
>>>
>>>      Recently we have discovered, by having disk r/w issues on a VM, that
>>>      after a delete - recreate action, specific VM is running on two
>>>      different hosts: the old placement host and the new placement host.
>>>
>>>      We are using the hooks system for host failure and a cron job at 5
>>>      minutes which is (re)deploying pending machines on available running
>>>      hosts.
>>>
>>>      By checking oned log files we couldn't find any abnormal behavior
>>>      and we are stuck.
>>>
>>>      Please guide us to find the root cause of this issue if is possible.
>>>
>>>      --
>>>      Thank you,
>>>      Robert Tanase
>>>
>>>
>>>
>>>  _______________________________________________
>>>  Users mailing list
>>>  Users at lists.opennebula.org
>>>  http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
>
> ------------------------------------------------------------------
> Steven C. Timm, Ph.D  (630) 840-8525
> timm at fnal.gov  http://home.fnal.gov/~timm/
> Fermilab Scientific Computing Division, Scientific Computing Services Quad.
> Grid and Cloud Services Dept., Associate Dept. Head for Cloud Computing
>
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