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Learning OpenStack High Availability by Rishabh Sharma

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Chapter 4. Clustering, Fencing, and Active/Passive Services

Generally, OpenStack services offer stateless services and manage them to be as stateful services by providing redundant instances and load balancing them. However, it is very difficult to manage these services because of multiple actions that are involved in every request for them. In this chapter, we will make the stateful services highly available based on active/passive configuration.

An active/passive configuration means bringing additional resources online when other resources fail. Pacemaker or Corosync applications are used to bring back backup resources online whenever it is necessary. High availability will be achieved via a stack of components such as Pacemaker and Corosync. ...

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