Focused, hands-on DevOps and server-side problems with hints, feedback, and automated solution checks.
A freshly rolled out Deployment runs an image from the team's private container registry, but its Pods are stuck in ImagePullBackOff and the catalog page returns 503. Find out why and get the Pods running.
A railway app publishes two endpoints through an Ingress, and both return 503. Find out why and make both endpoints answer again.
An nginx Deployment runs fine, but its address returns an error. Trace the path from the Ingress to the Pod and fix the manifests.
A storefront needs eight replicas, and the platform team wants them split down the middle between the two availability zones. An uneven split must be refused by the scheduler rather than quietly tolerated.
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.
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 Deployment is running in the platform namespace with 3 replicas. Each pod has configuration files at /app/config/. Copy those files to /home/laborant/config/ on the local machine.
A Snake game Deployment and ClusterIP Service are already running in the snake namespace. Create a Traefik Ingress that serves the game over HTTPS using an existing cert-manager-issued TLS Secret.
A Deployment running a distroless Chainguard nginx image (cgr.dev/chainguard/nginx) is deployed in the namespace webapps, fronted by a ClusterIP Service. Port-forward that Service to localhost port 3333 on cplane-01, use curl to save the response body to /home/laborant/index.html, and verify the file is accessible and contains the expected content.
A Job manifest at /home/laborant/batch-job.yaml is exiting with a non-zero exit status. The Job has limited retries configured. Inspect the cluster and the manifest to find the bug, fix it, and reapply.