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Senlin Architecture
Senlin is a service to create and manage clusters of homogeneous resources in an OpenStack cloud. Senlin provides an OpenStack-native ReST API.
Detailed Description
What is the purpose of the project and vision for it?
Senlin provides a clustering service for OpenStack that manages a collection of nodes that are of the same type.
Describe the relevance of the project to other OpenStack projects and the OpenStack mission to provide a ubiquitous cloud computing platform:
The Senlin service aggregates resources exposed by other components of OpenStack into a cluster. Such a cluster can be associated with different policies that can be checked/enforced at varying enforcement levels. Through service APIs, a user can dynamically add nodes to and remove nodes from a cluster, attach and detach policies, such as creation policy, deletion policy, load-balancing policy, scaling policy, health checking policy etc. Through integration with other OpenStack projects, users will be enabled to manage deployments and orchestrations large scale resource pools much easier. Currently no other clustering service exists for OpenStack. The developers believe cloud developers have a strong desire to create and operate resource clusters on OpenStack deployments. The Heat project provides a preliminary support to resource groups but Heat developers have achieved a consensus that such kind of a service should stand on its own feet.
Senlin Services
The developers are focusing on creating an OpenStack style project using OpenStack design tenets, implemented in Python. We have started with a close interaction with Heat project.
As the developers have only started development in December 2014, the architecture is evolving rapidly.
senlin
The senlin tool is a CLI which communicates with the senlin-api to manage clusters, nodes, profiles, policies and events. End developers could also use the Senlin REST API directly.
senlin-api
The senlin-api component provides an OpenStack-native REST API that processes API requests by sending them to the senlin-engine over RPC.
senlin-engine
The senlin engine's main responsibility is to orchestrate the clusters, nodes, profiles and policies.