title: How to whitelist entire kubernetes cluster on external server
body: <p>I have a kubernetes cluster with several nodes, and it is connecting to a SQL server outside of the cluster. How can I whitelist these (potentially changing) nodes on the SQL server firewall, without having to whitelist each Node's external IP independently?</p>
  <p>Is there a clean solution for this? Perhaps some intra-cluster tooling to route all requests through a single node?</p>