[Pacemaker] [Fuel][HA] Notifying clones of offline nodes

[Andrew Beekhof]

On 27 May 2014, at 1:16 am, Vladimir Kuklin <vkuklin at mirantis.com> wrote:

> Hi all
> 
> We are working on HA solutions for OpenStack(-related) services and figured out that sometimes we need clones to be notified if one of the cluster nodes running clone instances goes offline. E.g., we need this information to make RabbitMQ AMQP broker cluster to forget this node until it goes up again. This is easily achievable if we stop the instance on the node - then notification is sent to clone instances and everything is fine. But what can we do if node goes offline unexpectedly? Is there any way to notify other clones that the slave is dead and perform corresponding actions?

Currently no, but it sounds like a useful feature to add.

> 
> One of the ways we figured out is to implement additional cluster monitoring action in resource OCF and purge "dead" nodes, but it looks a little bit overwhelming and inconvenient. Is there a chance we missed some attributes that allow configuration of such behaviour that pacemaker notifies other clones on node offline/fence/cold_shutdown ?
> 
> 
> 
> -- 
> Yours Faithfully,
> Vladimir Kuklin,
> Fuel Library Tech Lead,
> Mirantis, Inc.
> +7 (495) 640-49-04
> +7 (926) 702-39-68
> Skype kuklinvv
> 45bk3, Vorontsovskaya Str.
> Moscow, Russia,
> www.mirantis.com
> www.mirantis.ru
> vkuklin at mirantis.com
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