[openstack-dev] [Nova] [Neutron] How do we know a host is ready to have servers scheduled onto it?

Stephen Gran stephen.gran at theguardian.com
Thu Dec 12 17:25:26 UTC 2013

On 12/12/13 17:19, Chris Friesen wrote:
> On 12/12/2013 11:02 AM, Clint Byrum wrote:
>> So I'm asking, is there a standard way to determine whether or not a
>> nova-compute is definitely ready to have things scheduled on it? This
>> can be via an API, or even by observing something on the nova-compute
>> host itself. I just need a definitive signal that "the compute host is
>> ready".
> Is it not sufficient that "nova service-list" shows the compute service
> as "up"?
> If not, then maybe we should call that a bug in nova...

The nova-compute service does not, currently, know about the health of, 
say, the neutron openvswitch agent running on the same hardware, 
although that being in good shape is necessary to be able to start 
instances and have them be useful.  This kind of cross-project state 
coordination doesn't exist right now, AFAIK.

Stephen Gran
Senior Systems Integrator - theguardian.com
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