Focused, hands-on problems for sharpening your DevOps and server-side skills. Some teach specific concepts while others mirror real-world scenarios. Every challenge includes hints, feedback, and automated solution checks.
Learn how to reconfigure the Kubernetes cluster DNS domain by updating CoreDNS ConfigMap and kubelet configuration on all nodes, a critical skill for custom cluster networking and CKA exam preparation.
A service in the mesh namespace returns only a single IP during DNS lookup, preventing the peer-server pods from finding each other. Investigate why DNS does not return one address per pod and change the service configuration so that peer discovery works correctly.
A Service exists in a namespace. Use a temporary Pod to resolve DNS, save the output, and confirm the Pod is automatically removed after the tasks complete.
Create a Pod with ConfigMap volume mount, expose it via ClusterIP Service, and test connectivity from another namespace. This combines multiple Kubernetes concepts.