World K1: The Food Court

One container is easy, 200 are not

You will learn: why big apps need a manager for their containers.

Checked with Kubernetes 1.37 on 31 Oct 2026

The problem

Tap each point on the timeline.

One container is easy to run. Now try 200, all night long. Tap through this night. What went wrong?

Watch

You are here: cluster kind-dev namespace default

~ $ kubectl create deployment shop --image=nginx:1.29-alpine --replicas=3deployment.apps/shop created~ $ sleep 10~ $ kubectl get podsNAME                   READY   STATUS    RESTARTS   AGEshop-68b774968-c49qc   1/1     Running   0          10sshop-68b774968-sdpc7   1/1     Running   0          10sshop-68b774968-xhm67   1/1     Running   0          10s

An is a food court manager for containers. You give one order: 3 trays. It finds stalls and spreads the trays out.

Try it

Who does each job? Sort them.

Drag a card into a box. Or tap the card, then tap the box.

Predict

This time a manager is on duty. A stall closes at 1 a.m. What happens to its trays?

Check

You are here: cluster kind-dev namespace default

~/shop $ kubectl get nodesNAME                STATUS     ROLES           AGE     VERSIONdev-control-plane   Ready      control-plane   6m22s   v1.37.0dev-worker          NotReady   <none>          6m22s   v1.37.0dev-worker2         Ready      <none>          6m22s   v1.37.0~/shop $ sleep 300~/shop $ kubectl get podsNAME                   READY   STATUS        RESTARTS   AGEshop-747bf9cf8-97b8b   1/1     Running       0          9sshop-747bf9cf8-fkghv   1/1     Terminating   0          6m22sshop-747bf9cf8-rwgp6   1/1     Running       0          9sshop-747bf9cf8-swtzz   1/1     Running       0          6m22sshop-747bf9cf8-xl6hg   1/1     Terminating   0          6m22s

Here is that night, with a manager. sleep 300 skips 5 minutes. Two new trays now run on another stall. Nobody woke up.

You did it!

You can now explain why big apps need an orchestrator.

Go deeper (optional)

The name Kubernetes comes from Greek. It means helmsman: the one who steers a ship. K8s is the short form: 8 letters sit between K and s. Google shared it as open source in 2014.

Real rep (optional): read “Why you need Kubernetes” on the overview page below.