Pods: a tray of dishes

Nasi lemak is rice, sambal and egg. They leave the kitchen together, on one tray. Your web app needs a small helper right beside it, always. Where should the helper go?

~/shop $ kubectl apply -f tray.yamlpod/tray created~/shop $ kubectl wait --for=condition=Ready pod/tray --timeout=60spod/tray condition met~/shop $ kubectl get podsNAME   READY   STATUS    RESTARTS   AGEtray   1/1     Running   0          4s

A podpod: A tray of dishes that always go together: one or more containers. is a tray. It holds one or more containers. Kubernetes puts the whole tray on one stall, never half. kubectl apply -f tray.yaml sends the tray to the food court.

This tray.yaml has one small slip. Press Apply, read the real error, then fix the line.

Your turn. Send the tray to the food court. Then check it with kubectl get pods.

~/shop $ kubectl apply -f duo.yamlpod/duo created~/shop $ kubectl wait --for=condition=Ready pod/duo --timeout=60spod/duo condition met~/shop $ kubectl get pod duo -o wideNAME   READY   STATUS    RESTARTS   AGE   IP           NODE         NOMINATED NODE   READINESS GATESduo    2/2     Running   0          4s    10.244.1.3   dev-worker   <none>           <none>

Two containers, one tray. READY says 2/2. Look: one IP address, one stall. Inside the tray, they reach each other at localhost.

You run kubectl delete pod tray. What happens next?

Shared by the whole tray, or one per container? Sort them.

You can now explain what a pod is and what it shares.