VISUAL CONCEPTS

How Kubernetes decides which node runs your pod. Watch the scheduler filter nodes, score them, and bind the pod all in under 2 seconds on the real cluster.

A Service is not a server. It is a virtual IP backed by iptables rules that load-balance across pod endpoints. Watch traffic arrive and get forwarded to a healthy pod.

Zero downtime upgrades. Kubernetes creates new pods one at a time, waits for them to be ready, then terminates old ones. Watch every pod swap happen live.

Every kubectl command writes to etcd first. The API server, scheduler and controller manager all watch etcd for changes and react. Lose etcd, lose the entire cluster state.