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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.
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Debug a Go Container Image That Fails to Start After a Recent Change
A Go service that has always been shipped as a static binary in a scratch-y image suddenly fails to start in a container, while the local build works as before. Find what recent changes caused it and fix the image without reverting them.
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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
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.
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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'?
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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?
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When a FROM scratch Container Image Is Not Good Enough
Learn on practice the limitations of FROM scratch images and the ways to mitigate them.