You deleted your Pod. It never came back. We started it with kubectl run, which made a Pod, a running copy of your container. Then we deleted it, and kubectl get pods says no resources found. The empty output means your app is gone.

Both sides get the same delete, but only one comes back. The lone Pod was made by kubectl run, and nothing watches it, so it just disappears. A Deployment is a manager holding a target Pod count. It notices one is missing and creates a replacement.

We create a Deployment instead, then delete the Pod it made. That Pod name is generated, and these names are illustrative. Now look at kubectl get pods. A new Pod with a different name is already running, only three seconds old. The Deployment wanted one Pod, found zero, and created a replacement.

A Pod on its own has no one to bring it back. So for anything you expect to keep running, use a Deployment.