Focused, hands-on DevOps and server-side problems with hints, feedback, and automated solution checks.
A payment service subscribes to payment requests through NATS. Run the checkout team's test script as a Job in the checkout namespace, with the required settings, and make sure the payment request arrives.
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 new service needs to run in your development environment, but the port it requires is already in use by another app that has to keep working. Diagnose the conflict, free the port without taking the other app down, and get both services running side by side - a realistic exercise in untangling local port conflicts.
Learn a bunch of Linux networking tricks while trying to access an Nginx server running inside a Docker container with no published ports.
