Master node(s):
TCP 6443* Kubernetes API Server
TCP 2379-2380 etcd server client API
TCP 10250 Kubelet API
TCP 10251 kube-scheduler
TCP 10252 kube-controller-manager
TCP 10255 Read-Only Kubelet API
Worker nodes (minions):
TCP 10250 Kubelet API
TCP 10255 Read-Only Kubelet API
TCP 10256 kube-proxy
TCP 30000-32767 NodePort Services