@startuml
database etcd [
  etcd 
]

package "master-node" {
  [api-server] -> etcd

  [kubelet] --> [api-server] : watch
  [kubelet] --> [container-runtime] : run & watch
  
  [scheduler] --> [api-server] : watch
  [scheduler] --> [api-server] : apply

  [controller-manager] --> [api-server] : watch
  [controller-manager] --> [api-server] : apply
}

package "worker-node-1" {
  [kubelet ] --> [api-server] : watch
  [kubelet ] --> [container-runtime ] : run & watch

}

package "worker-node-2" {
  [kubelet  ] --> [api-server] : watch
  [kubelet  ] --> [container-runtime  ] : run & watch
}

@enduml