[openstack-dev] [nova] Automatic Evacuation

Costantino, Leandro I leandro.i.costantino at intel.com
Thu Feb 20 22:05:56 UTC 2014


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 

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?


[1] https://blueprints.launchpad.net/nova/+spec/vm-auto-ha-when-host-broken

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