Nova Concepts:

Nova’s lower level programming API’s:

Nova VM provisioning form OpenStack’s Training Guide:
There is also a writeup on Managing Volumes:

OpenStack Cloud Request Flow: Demonstration of the flow of REST API requests between key services that comprise the OpenStack Compute Use Case : Provision a Virtual Machine for OpenStack Essex release.

VM Creation process - 2014

Internals of launching an instance in OpenStack Nova:

Swift Developer documentation:

Authentication System for Swift:

Storage Components Swift and Cinder from developerWorks: