Kubernetes Cookbook - Second Edition

Pod-to-Pod communication

As mentioned, containers in a Pod share the same network namespace. And a Pod is the basic computing unit in Kubernetes. Kubernetes assigns an IP to a Pod in its world. Every Pod can see every other with the virtual IP in Kubernetes network. While talking about the communication between Pods , we can separate into two scenarios: Pods that communicate within a node, or Pods that communicate across nodes. For Pods in single node, since they have separate IPs, their transmissions can be held by bridge, same as containers in a Docker node. However, for communication between Pods across nodes, how would be the package routing work while Pod doesn't have the host information (the host IP)?

Kubernetes uses the CNI to handle ...