Add proposal for nova-compute-api
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Introduction
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============
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In the beginning there was Nova. It included volumes, networking,
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hypervisors, and scheduling. Since then, Nova components have either
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been replaced (nova-network with Neutron) or forklifted out and enhanced
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(Cinder). In so doing, interfaces were defined for how Nova would
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continue to make use of these now-external services, but nova-compute,
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the place where the proverbial rubber meets the road, was left inside
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Nova. This meant that agents for Cinder and Neutron had to interact with
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nova-compute through the high level message bus, despite being right
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on the same physical machine in many (but not all) cases. Likewise,
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some cases take advantage of that, and require operator cooperation in
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configuring for certain drivers.
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This has led to implementation details leaking all over the API's that
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these services use to interact. Neutron and Nova do a sort of haphazard
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dance to plug ports in, and Cinder has drivers which require locking files
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on the local filesystem a certain way. These implementation details are
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leaking into public API's because it turns out nova-compute is actually
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a shared service that should not belong to any of the three services,
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and which should define a more clear API which Nova, Cinder, and Neutron,
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should be able to use to access the physical resources of machines from
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an equal footing.
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proposed next steps
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===================
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* Produce an accurate analysis on the current state of nova-compute's
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interaction with other OpenStack services.
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* Produce a cross-project spec for moving nova-compute out of Nova
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and defining an API for it that meets the needs of all other projects.
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