How Layered Kubernetes Misconfigs Broke an Ingress Setup and How They Were Fixed

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A developer debugging a broken Kubernetes Ingress setup found that example.com had stopped loading after mid-session changes, including installing the Calico CNI on top of an existing one. Initial checks confirmed DNS and local hosts resolution were functioning correctly, pointing the IP to the Ingress controller's ClusterIP address. Further investigation revealed that ClusterIPs are virtual addresses only accessible within the specific machine running the cluster, making them unreachable from any external VM or host. The debugging process then shifted to identifying the actual Docker container IP backing the kind cluster node, paired with the Ingress controller's NodePort for a routable connection. The walkthrough emphasizes the diagnostic process itself — systematically ruling out DNS, firewall, and networking issues one step at a time — as the key learning takeaway.

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