[Users] vms behaviour when a host shut down

[Itamar Heim]

On 01/24/2014 04:43 PM, Nathanaël Blanchet wrote:
> Typically, we ask to our inverter to send a signal to the host to shut
> down when it runs on his battery so as OS extinction to be "clean". So
> we also want that the guests to shut down cleanly because they are so
> much important than the host, to prevent of database corruption for
> instance. For this, we could imagine host sending an init signal through
> a virtual serial port to the VMs. Do you think it is possible in that or
> an other way?

you should send the engine an API call to either shutdown the VMs, or 
migrate them to another host.
moving the host to maint before killing it is also a "nicer" behavior.
if the VMs will die, no via the engine, then the HA ones will be 
restarted on another host.
live migrating them if possible would be better than kill/restart.
(but if you ask engine to stop them, rather than migrate them, then you 
also have to own starting them again)

> Le 24/01/2014 15:17, Dan Kenigsberg a écrit :
>> On Fri, Jan 24, 2014 at 10:01:52AM +0100, Nathanaël Blanchet wrote:
>>> Hi all,
>>>
>>> I'd like to be sure about the behaviour of vms when hist host goes
>>> down for any reason. I suppose high availibility is for migrating
>>> vms to another host, but how to do if I prefer them to shut down at
>>> the same time of the host?
>> For a planned shutdown of a host, you should move it to "maintenance"
>> mode (which migrates all VMs from it) or shut down the VMs individually.
>>
>> If the host unexpectedly dies, it would be fenced by Engine.
>> Highly-available VMs that were running on it, would be re-started on
>> another host. You can mimic such a condition with logging into the host
>> as root and doing
>>      service vdsmd stop
>>      pkill qemu-kvm
>> (and may the force be with your guest's data)
>
> --
> Nathanaël Blanchet
>
> Supervision réseau
> Pôle exploitation et maintenance
> Département des systèmes d'information
> 227 avenue Professeur-Jean-Louis-Viala
> 34193 MONTPELLIER CEDEX 5 	
> Tél. 33 (0)4 67 54 84 55
> Fax  33 (0)4 67 54 84 14
> blanchet at abes.fr
>
>
>
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