** Also affects: nova
Importance: Undecided
Status: New
** Changed in: nova
Status: New => Confirmed
** Changed in: nova
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1515311
Title:
Instance scheduling based on Neutron properties
Status in neutron:
New
Status in OpenStack Compute (nova):
Confirmed
Bug description:
Add support to allow nova scheduler place instances along available
neutron properties.
Use case:
- Scheduling along physical network: A certain network (e.g. your fast
100Gbit network) is only available to a subset of the nodes (e.g. per rack).
- Schedulding along QoS attributes: Schedule instances along available
bandwidth
Proposal:
Integration might be challenging, as also nova needs to be enhanced with a
new filter. Ihar talked to nova folks (Nikola Dipanov, Jay Pipes, Sylvain) but
they seemed not to be interested in fulfilling this need right now. However
they have a vague idea of a scheduler hook to influence scheduling decisions.
Alternative to nova scheduler hook:
Today scheduling decision is made on resource data reported from nova-cpu to
nova scheduler via the message bus. What would be required is a similar
reporting from neutron-agent to nova-scheduler. However such a private path
might be against the decoupling of nova and neutron, introduce new message
topics and so on.
Note: This bug is intended to track all information from Neutron side. It's
not meant as a requirement against nova.
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