Challenge, Easy, on
Gracefully Stop a Container With a Lengthy Shutdown Sequence
Learn how to properly stop a Docker container whose application needs more than the default 10 seconds to shut down gracefully.
Submissions: 80/143
Challenges
Focused, hands-on problems for sharpening your DevOps and server-side skills. Some teach specific concepts while others mirror real-world scenarios. Every challenge includes hints, feedback, and automated solution checks.
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.
Submissions: 474/982
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.
Submissions: 269/476
Challenge, Medium, on
Docker 101: Execute Commands in a Running Container
Learn how to execute commands inside running containers using 'docker exec' - a crucial skill for debugging containerized applications and exploring container environments.
Submissions: 661/785
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'?
Submissions: 224/466
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?
Submissions: 88/186
Copy Files To/From a Running Kubernetes Pod: a Distroless Image Case
An ultimate Kubernetes debugging challenge: can you copy files to/from a running Pod that doesn't have a shell or other command line tools installed?
Submissions: 123/357
Copy Files To/From a Running Kubernetes Pod: a Simple Case
Practice copying files to/from running Kubernetes Pods to become a Kubernetes troubleshooting ninja.
Submissions: 722/934
Challenge, Easy, on
Copy Files To/From a Running Docker Container
Practice copying files to/from running containers to become a container troubleshooting wizard.
Submissions: 366/489
Challenge, Medium, on
Extract the Filesystem of a Container Image
Can you unpack the filesystem of a container image into a local directory?
Submissions: 441/897