Question

A developer complains that two containers in the same Pod cannot reach each other over 'localhost' as they expected, but claims each container should have its own IP. As the platform engineer, how do you correctly explain the Kubernetes networking model for containers within a single Pod?

Accepted Answer

All containers in a Pod share a single network namespace and IP address, so they communicate with each other over localhost using different ports.

Answer

Each container in a Pod receives its own unique IP address, and they must communicate using the Pod's Service DNS name.

Answer

Containers in a Pod are network-isolated by default and require a NetworkPolicy to allow localhost traffic between them.

Answer

Containers in a Pod communicate only through a shared emptyDir volume, since intra-Pod network traffic is disabled.