2.1 KiB
2.1 KiB
Technical Reference Deep Dives
The nova project is large, and there are lots of complicated parts in it where it helps to have an overview to understand how the internals of a particular part work.
Internals
The following is a dive into some of the internals in nova.
/reference/rpc: How nova uses AMQP as an RPC transport/reference/scheduling: The workflow through the scheduling process/reference/live-migration: The live migration flow/reference/services: Module descriptions for some of the key modules used in starting / running services/reference/vm-states: Cheat sheet for understanding the life cycle of compute instances/reference/threading: The concurrency model used in nova, which is based on eventlet, and may not be familiar to everyone./reference/notifications: How the notifications subsystem works in nova, and considerations when adding notifications./reference/update-provider-tree: A detailed explanation of theComputeDriver.update_provider_treemethod.
Debugging
/reference/gmr: Inspired by Amiga, a way to trigger a very comprehensive dump of a running service for deep debugging.
Forward Looking Plans
The following section includes documents that describe the overall plan behind groups of nova-specs. Most of these cover items relating to the evolution of various parts of nova's architecture. Once the work is complete, these documents will move into the "Internals" section.
If you want to get involved in shaping the future of nova's architecture, these are a great place to start reading up on the current plans.
/user/cells: Comparison of Cells v1 and v2, and how v2 is evolving/reference/policy-enforcement: How we want policy checks on API actions to work in the future/reference/stable-api: What stable api means to nova/reference/scheduler-evolution: Motivation behind the scheduler / placement evolution