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On 02/20/2014 05:05 PM, Costantino, Leandro I wrote:
> Hi,
> 
> Would like to know if there's any interest on having 'automatic
> evacuation' feature when a compute node goes down.
> I found 3 bps related to this topic:
>    [1] Adding a periodic task and using ServiceGroup API for
> compute-node status
>    [2] Using ceilometer to trigger the evacuate api.
>    [3] Include some kind of H/A plugin  by using a 'resource
> optimization service'
> 
> Most of those BP's have comments like 'this logic should not reside in
> nova', so that's
> why i am asking what should be the best approach to have something like
> that.
> 
> Should this be ignored, and just rely on external monitoring tools to
> trigger the evacuation?
> There are complex scenarios that require lot of logic that won't fit
> into nova nor any other OS component. (For instance: sometimes it will
> be faster to reboot the node or compute-nova than starting the
> evacuation, but if it fail X times then trigger an evacuation, etc )
> 
> Any thought/comment// about this?
> 
> Regards
> Leandro
> 
> [1] https://blueprints.launchpad.net/nova/+spec/vm-auto-ha-when-host-broken
> [2]
> https://blueprints.launchpad.net/nova/+spec/evacuate-instance-automatically
> [3]
> https://blueprints.launchpad.net/nova/+spec/resource-optimization-service

My opinion is that I would like to see this logic done outside of Nova.

-- 
Russell Bryant