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.
The security team left five NetworkPolicy files on the workstation. Only one of them lets the frontend reach the backend while granting nothing more. Identify it and deploy it, unchanged.
A Pod must be fully isolated from the cluster network. Deny all incoming traffic and block all outgoing traffic except DNS queries on port 53.
Learn how to control traffic between Pods using Kubernetes NetworkPolicy. Apply a default deny-all policy and then selectively allow only the traffic that is required between frontend and backend Pods.
A multi-tier application runs across two namespaces. Learn how to isolate the application tier and restrict database access to only the application namespace.