Every node within a Couchbase Cluster includes the Cluster Manager component. The Cluster Manager is responsible for the following within a cluster:
Cluster management
Node administration
Node monitoring
Statistics gathering and aggregation
Run-time logging
Multi-tenancy
Security for administrative and client access
Client proxy service to redirect requests
Access to the Cluster Manager is provided through the administration interface (see Section 1.3.9, “Administration Tools”) on a dedicated network port , and through dedicated network ports for client access. Additional ports are configured for inter-node communication.