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.
Add a new, separate Service CIDR range for the dev team using the ServiceCIDR API object — without touching or restarting the cluster's default Service CIDR — then create a Service with an explicit ClusterIP inside that new range and verify DNS resolution.
Configure a Kubernetes Service so that requests from the same client IP are always routed to the same backend Pod for a sustained period, using ClientIP-based session affinity.
Create an Ingress resource for a shop application with path-based routing to multiple backend services and configure /etc/hosts for local DNS resolution.
A Deployment with two nginx containers has a port conflict — both containers use port 80. Fix the conflict by updating the ConfigMap, mounting it into the second container, updating the containerPort, and exposing both containers via a NodePort Service.
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.
A multi-tier application runs across two namespaces. Learn how to isolate the application tier and restrict database access to only the application namespace.