CMAN – Connection Manager

• Running cman_tool join on a node initiates the process of adding it to an active cluster.

• Running cman_tool leave removes the node (provided there are no live services).

• Heartbeats are sent around the cluster to detect node failures.

• A node joining, leaving or failing triggers a cluster transition which gets orchestrated by one of the nodes.

• Quorum is used to deal with possible split-brain scenarios.