Challenge on ,
Troubleshoot an Ingress That Returns 503 Service Unavailable
by Omkar Shelke
A railway app publishes two endpoints through an Ingress, and both return 503. Find out why and make both endpoints answer again.
Challenges
Focused, hands-on DevOps and server-side problems with hints, feedback, and automated solution checks.
Challenge on
Debug a Pod Stuck at 0/1 Ready Due to a Readiness Probe
by Omkar Shelke
A new intern learning about probes wrote a small Pod manifest. The exec command and the application are both correct, but the Pod never becomes Ready because one probe parameter is missing. Find it and add it.
Challenge on
Inject a Config File Without Overwriting the Image's Existing Directory
by Omkar Shelke
A webapp deployment in the prod namespace is stuck in CrashLoopBackOff. The application's startup probe checks that its existing config directory is intact before the container is marked healthy. Fix the deployment so configuration is injected correctly and the pod reaches Running state with its health check endpoint responding on port 8080.
Challenge on
Configure Health Probes and Graceful Shutdown for a Kubernetes Deployment
by Omkar Shelke
A deployment is running without health probes or graceful shutdown configuration. Add startup, liveness, and readiness probes plus a preStop hook and terminationGracePeriodSeconds to make it ready for real traffic.
Challenge on
Keep Pods Healthy with Liveness and Readiness Probes
by Omkar Shelke
Add HTTP-based liveness and readiness probes to an existing Kubernetes Deployment and verify application health and availability.