[openstack-dev] [nova-scheduler] Get scheduler hint

Mooney, Sean K sean.k.mooney at intel.com
Tue May 2 17:12:56 UTC 2017

> -----Original Message-----
> From: Jay Pipes [mailto:jaypipes at gmail.com]
> Sent: Tuesday, May 2, 2017 5:59 PM
> To: openstack-dev at lists.openstack.org
> Subject: Re: [openstack-dev] [nova-scheduler] Get scheduler hint
> On 05/02/2017 12:33 PM, Giuseppe Di Lena wrote:
> > Thank you a lot! :-).
> > Actually, we are also working in parallel to implement the algorithm
> with tacker, but for this project we will only use the basic modules in
> OpenStack and Heat.
[Mooney, Sean K] if you can use heat you can use the server anti affinity filter
To create a server group per port-pair group and ensure that two instance of the same
port-pair-group do not reside on the same server. You could also use heat's/senlin's
Scaling groups to define the insantce count of each SF in the chain. 
There was a presentation on this in Barcelona 
But as jay says below it depends on what you are trying to solve.
If you are trying to model ha constraints for a service chain the above may
Help however it is likely outside the scope of nova/placement api to support this directly.

> >
> > If the scheduler hints are no longer supported, what is the correct
> way to give the scheduler personalized input with the instance details?
> > Best regards Giuseppe
> Again, it depends on what problem you are trying to solve with this
> personalized input... what would the scheduler do with the length of
> the service chain as an input? What are you attempting to solve?
> Best,
> -jay
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