title: Needed ports for Kubernetes cluster
body: <p>Suppose I want to create a k8s cluster on bare metal servers, with 1 master and 2 nodes. What ports do I have to open in my firewall so that the master and nodes can communicate over the Internet? (I know I can just use VPN, but I just want to know which ports I need). I guess I need at least the following ports. Do I need more? How about if I'm using Flannel or Calico? I want to create a <em>comprehensive</em> list of all possible k8s services and needed ports. Thank you.</p>
  
  <p>kubectl - 8080</p>
  
  <p>ui - 80 or 443 or 9090</p>
  
  <p>etcd - 2379, 2380</p>