[one-users] Fault Tolerance and shared storage

[Tino Vazquez]

Hi,

Thanks for the info.

The hook for host error in OpenNebula 4.4 allows to define one, and only
one, of the "-r" and "-d" flags:

   * -r will "delete --recreate" the VM in the failed host, this will go
through the epilog_delete phase, and it should erase the sym links and
launch the VM again. This is probably what you want, please come back if
the problem does not go away

  * -d will "delete" the VM in the failed host, but won't launch the VM
again.

These two are mutually exclusive.

Regards,

-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 March 2014 17:48, Nuno Serro <nserro at reitoria.ulisboa.pt> wrote:

>  Hello Tino,
>
> We are using version 4.4.1. If you need any details on the configuration I
> can provide them.
>
>
>
>       Nuno Serro
> Coordenador
> Núcleo de Infraestruturas e Telecomunicações
> Departamento de Informática
>
> Alameda da Universidade  -  Cidade Universitária
> 1649-004 Lisboa    PORTUGAL
> T. +351 210 443 566 - Ext. 19816
> E. nserro at reitoria.ulisboa.pt
> www.ulisboa.pt
>
>
>
>
>  On 26-03-2014 16:44, Tino Vazquez wrote:
>
> Hi Nuno,
>
>  What version of OpenNebula are you using?
>
>  Best,
>
>  -Tino
>
>
> --
> OpenNebula - Flexible Enterprise Cloud Made Simple
>
> --
> Constantino Vázquez Blanco, PhD, MSc
> Senior Infrastructure Architect at C12G Labs
> www.c12g.com | @C12G | es.linkedin.com/in/tinova
>
> --
> Confidentiality Warning: The information contained in this e-mail and any
> accompanying documents, unless otherwise expressly indicated, is
> confidential and privileged, and is intended solely for the person and/or
> entity to whom it is addressed (i.e. those identified in the "To" and "cc"
> box). They are the property of C12G Labs S.L.. Unauthorized distribution,
> review, use, disclosure, or copying of this communication, or any part
> thereof, is strictly prohibited and may be unlawful. If you have received
> this e-mail in error, please notify us immediately by e-mail at
> abuse at c12g.com and delete the e-mail and attachments and any copy from
> your system. C12G thanks you for your cooperation.
>
>
> On 26 March 2014 17:29, Nuno Serro <nserro at reitoria.ulisboa.pt> wrote:
>
>>  Hello,
>>
>> We've started using a system datastore whith a shared storage in a
>> clustered fs, so we could start testing the live migrate functionality. The
>> live migrate is working as expected, but when testing the fault tolerance
>> using the host_hook, we noticed the following error:
>>
>> [TM][I]:  ln -s "/dev/vg-nebula/lv-one-144"
>> "/var/lib/one/datastores/109/393/disk.0"" failed: ln: failed to create
>> symbolic link `/var/lib/one/datastores/109/393/disk.0': File exists
>> [TM][E]: Error linking /dev/vg-nebula/lv-one-144
>>
>> I understand the error. When I kill one node and host_hook kicks in,
>> being the storage shared between nodes, the symlinks to the images are
>> already there.
>>
>> My question is regarding the hook definition:
>>
>> HOST_HOOK = [
>>     name      = "error",
>>     on        = "ERROR",
>>     command   = "ft/host_error.rb",
>>     arguments = "$ID -r",
>>     remote    = "no" ]
>>
>> Is it possible to configure the hook to delete the VM, and afterwards
>> creating it? We tried combining "-d" and "-r" flags but only one flag seems
>> to be used.
>>
>> Thanks in advance.
>>
>> Regards,
>>
>>  --
>>
>>   Nuno Serro
>> Coordenador
>> Núcleo de Infraestruturas e Telecomunicações
>> Departamento de Informática
>>
>> Alameda da Universidade  -  Cidade Universitária
>> 1649-004 Lisboa    PORTUGAL
>> T. +351 210 443 566 <%2B351%20210%20443%20566> - Ext. 19816
>> E. nserro at reitoria.ulisboa.pt
>> www.ulisboa.pt
>>
>>
>>
>>
>>
>> _______________________________________________
>> Users mailing list
>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>
>>
>
>
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>
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