Challenge on ,
Reach a Distroless Container's Debug Endpoint From a Sidecar Container
A distroless container serves a debug interface on its own loopback address. Can you reach this debug endpoint using nothing but standard Docker commands?
Challenges
Focused, hands-on DevOps and server-side problems with hints, feedback, and automated solution checks.
Challenge on ,
Debug a Failing Kubernetes Job
by Omkar Shelke
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.
Challenge on ,
Execute Host Commands Inside a Running Container
Leverage your knowledge of Linux namespaces to reach an application's internal debug interface without installing anything into the container.
Challenge on ,
Run a Sidecar Container in the Namespace of Another Container
Learn how to run multiple Docker containers sharing the same PID, IPC, and network namespaces - a foundation of many advanced container use cases, including Kubernetes Pods construction and container debugging tools.
Challenge on ,
Ensure a Graceful Termination for a Containerized Node.js Application
Can you resolve issues with a Node.js container's termination process to ensure graceful shutdown on 'docker stop'?
Challenge on ,
Ensure a Graceful Termination for a Container With an Entrypoint Script
Can you make a container exit gracefully after the 'docker stop' command while preserving its extensible entrypoint mechanism?