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.
Configure a Vertical Pod Autoscaler (VPA) with a per-container resource policy that provides recommendations for the main container while excluding the sidecar container from any VPA-managed scaling.
Troubleshoot a Deployment where containers are repeatedly OOMKilled. Inspect Vertical Pod Autoscaler (VPA) recommendations and manually apply the recommended memory request and memory limit to stabilize the workload.
A LimitRange exists in the namespace but Pods are not receiving default resource requests and limits. Investigate the root cause and fix it.
Create a LimitRange in a namespace to enforce minimum, maximum, and default resource constraints for containers, then deploy a compliant Pod.
Debug and fix a Pod that fails to deploy due to resource constraint violations in a namespace with ResourceQuota and LimitRange policies.
Understand and implement Kubernetes Quality of Service (QoS) classes. Create Deployments and Pods with different QoS classes and identify eviction priority during resource pressure.