As the management control center within the cluster, Controller Manager is responsible for the management of Node, Pod replica, Service Endpoint, NameSpace, ServiceAccount, Resource Quota, etc. in the cluster. When a Node goes down unexpectedly, the Controller Manager will detect the fault in time and execute an automated repair process to ensure that the cluster is always in the expected working state.
Controller Manager包含：Replication Controller、Node Controller、ResourceQuota Controller、Namespace Controller、ServiceAccount Controller、Token Controller、Service Controller、Endpoint Controller等多个Controller。