The Hidden Pause Container in Every Kubernetes Pod!
Run kubectl get pods and you'll never see it, but every pod has a pause container that starts first and stops last. Its only job is to hold the pod's network namespace, the thing that gives all containers in the pod one shared IP, one set of ports, and localhost communication.
On Linux the kernel throws away a network namespace unless something stays attached to it. App containers crash and restart too often to be that anchor, so Kubernetes runs a tiny container (usually under 1 MB) that does nothing but stay paused inside the namespace. When your app container restarts, it rejoins the same namespace and the pod keeps its IP. If the pause container itself dies, the kubelet tears the pod down and rebuilds it, and the pod can come back with a different IP.
Under 2 minutes, start to finish.
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