Kubernetes Pods Can Run Without Being Ready: A Hands-On Troubleshooting Lab

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A Kubernetes Pod can be in the Running phase while its readiness condition is False, meaning the container is alive but not yet fit to receive traffic. A hands-on experiment using an NGINX Deployment, a ConfigMap, a readiness probe, and a Service was run in an isolated Minikube environment on Kubernetes v1.30.0 to demonstrate this. The setup used an exec readiness probe that checks a mounted file for the exact value 'ready', so changing that value to 'blocked' causes the probe to fail without stopping or restarting the container. The author's goal was to observe how Kubernetes responds to a Pod becoming unready and then restore readiness without a container restart. The lab also points out why this distinction matters in production, since a running container does not guarantee a ready application.

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