Senlin
OpenStack Clustering
The mission of the OpenStack Clustering project is to create a service for managing the homogeneous objects exposed by other services in an OpenStack cloud.
Senlin
Senlin provides a clustering service to create and manage objects of the same nature, e.g. Nova servers, Heat stacks, Cinder volumes, etc. The collection of these objects is referred to as a cluster. Senlin abstracts the physical objects as nodes, which can belong to any cluster of the same type. Senlin supports object creation, deletion and update via a concept called Profile. Each profile is in essential a driver to communicate with certain services for object manipulation.
With Senlin, user can attach a policy to a cluster and enforce it, or detach it from a cluster. Some built-in policies are provided to meet requirements such as auto-scaling, load-balancing, high-availability etc.
Senlin provides an OpenStack-native ReST API and a command line interface tool to other services and the users.
How it works
- A Senlin profile describes the information needed to create a node (or a cluster). A user will create a profile via Senlin first. Different profile types talk to different backend drivers.
- The profile then can be used to create a node or a cluster.
- The cluster membership can be changed by explicit adding or removal of nodes, or by a scale-in/out operation.
- User can instruct a node to join a cluster or leave its current cluster.
- A Senlin policy describes certain rules that will be checked and enforced.
- (TBC)
Architecture
Senlin comprises a number of Python applications:
senlin
The senlin tool is a CLI tool.
senlin-api
The senlin-api component provides an OpenStack-native ReST API.
senlin-engine
The senlin engine does the main work of managing clusters, nodes, profiles, policies, actions, events and webhooks.
Development
[TBD]
Get involved
IRC
The developers use IRC in #senlin on Freenode for development discussion.
Meetings
[TBD]
Mailing list
Discussions about Senlin happens on the openstack-dev mailing list.
Please use the tag [Senlin] in the subject line for new threads.
