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Master node // Control plane // Controller Node : == M+W == 3 , 5 ,7 , etcd quorum method == 50% up

Kube-api Server :

1. This api-server communicate with users(admin/dev.) as well as among cluster components.
2. It does the orchestration function.

Controller : Take care of the required/ actual state of cluster matching expected state.

2 pods // 1down == immediately controller will launch/create same pod .


Scheduler :
1. allocate specific node to create pod.
2. It gets H/W information required for configuration from config. file. Then it schedule the POD on node accordingly.
3. Kube scheduler decides the appropriate / suitable node creation and operation.

ETCD :
1. ETCD provides high available store (key-value pair).
2. its stored data as real time based.

Cloud Control Manager :

1. Integrate with underlying cloud provider.
2. It help to communicate with cluster from cloud provider.
3. Through is element we can deploy caas(Container as a service) service.