Nova Notes

• Nova allows you to create, manage, and destroy virtual servers based on your images via an API.
• Major components:
• A Web Server Gateway Interface to receive and manage API calls.
• Worker Daemons to carry out various tasks.
• The above two components may show in the form of custom-written Python daemons.
• message queue and database
• These two parts facilitate the asynchronous orchestration of complex tasks through message passing and information sharing. 
• End users who want to use Nova to create compute instances call nova-api with OpenStack API or EC2 API requests.
• Nova daemons exchange information through the queue (actions) and database (information) to carry out these API requests.
•  Nova interfaces through the Glance API to provide virtual disk imaging services.