Example Documentation: Multi Container Pod
Goal
Understand Pod boundaries using two containers with a shared network namespace.
What Is Done
One web container serves NGINX. A helper container in the same Pod checks the web container through 127.0.0.1.
Typical Commands
kubectl apply -f manifests/
kubectl logs -n multi-lab pod/multi-container-demo -c helper --tail=20
kubectl port-forward -n multi-lab pod/multi-container-demo 8080:8080
Validate Success
- Both containers run in the Pod.
- The helper reaches the web container through
localhost. - Port forwarding to the Pod shows the web content.
Common Mistakes
- Containers are incorrectly treated as separate hosts.
- Shared networking is confused with a shared filesystem.
- A container crash affects the whole Pod lifecycle.