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 ,
Troubleshoot an Ingress That Returns 404 Not Found
by Omkar Shelke
An nginx Deployment runs fine, but its address returns an error. Trace the path from the Ingress to the Pod and fix the manifests.
Challenge on
Node Is Ready, but Pods Won't Schedule
by Omkar Shelke
node-02 is back from a kernel upgrade but still shows Ready,SchedulingDisabled, and the Pods that can only run on it are stuck in Pending. Bring the node back into service and get the workload running, without touching the workload itself.
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
CKA Practice: Recover a NotReady Node After a Kubelet Configuration Error
A worker node dropped to NotReady and part of the workload went with it. The container runtime is fine and the control plane is healthy; the trail leads from kubectl symptoms down into systemd and the kubelet configuration. Diagnose the node and bring it back.
Challenge on
CKA Practice: Recover a Broken Static Control-Plane Pod
Every kubectl command against a kubeadm cluster fails, and the workload is still serving. With no API to query, the usual tools tell you nothing. Work from the node itself to find what broke and bring the control plane back.
Challenge on
Troubleshoot Why the Calendar Todo App Pods Are Stuck in Pending
by Omkar Shelke
The production "Calendar Todo" web application has been deployed in the prod namespace but all pods are stuck in Pending. Investigate the cluster, identify why the application cannot run, fix the underlying node issue, and verify the app is serving traffic on NodePort 31777.
Challenge on
Resolve ContainerCreating Issue Caused by Missing ConfigMap
by Omkar Shelke
A Deployment is stuck with Pods in ContainerCreating state because the required ConfigMap was not created. Fix the issue to make the application accessible.
Challenge on
Troubleshoot a Website That Is Not Accessible
by Omkar Shelke
A web application is deployed but the website is not accessible. Investigate and fix the issue.
Challenge on ,
Troubleshoot CrashLoopBackOff Caused by a Missing TLS Secret
by Omkar Shelke
A deployment is failing because the application cannot load its TLS certificate. Create the missing secret and mount it into the deployment so the Flask app can serve TLS traffic.