[Linux-cluster] Status of fencing KVM guests across multiple hosts

[Fabio M. Di Nitto]

On 06/21/2013 10:43 PM, Subhendu Ghosh wrote:
> On 06/21/2013 02:34 AM, Vladislav Bogdanov wrote:
>> 21.06.2013 04:46, Digimer wrote:
>>> Hi all,
>>>
>>>   I want to update the Guest Fencing docs on
>>> http://clusterlabs.org/wiki/Guest_Fencing and write a little tutorial as
>>> well. The CL page says;
>>>
>>> For Guests Running on Multiple Hosts
>>>
>>> Not yet supported, check back soon.
>>>
>>> Rough commands:
>>>
>>>   I wanted to know where this was today, as I think that's a little out
>>> of date now. Has support been added? If not, does it work at a technical
>>> level and simply isn't supported by Red Hat?
>>
>> It works for latest fedoras out-of-the-box, but was removed from EL6.4.
>> Package names changed a bit (qpid -> qmf), but idea still the same.
>>
>> http://oss.clusterlabs.org/pipermail/pacemaker/2013-June/018662.html
>>
>> https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.4_Technical_Notes/matahari.html
>>
>>>
>>>   Cheers
>>>
>>
> 
> Note: if you have guest migration capability and use it, then your fencing
> operation
> should coordinate with the guest migration/location control. RHEV/oVirt or vSphere
> are the typical control points. Otherwise you have dueling mechanisms for
> controlling
> the KVM guests.

We don't really support live-migration of virtualized cluster nodes.
There is a technical barrier that makes it almost impossible to achieve.
We do have some best practise and a process to do it tho.

Fabio