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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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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.
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Edit a File in a Running Container: a Slim Base Image Case
Can you edit a file in a running container? What if there is no shell?
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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.
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What Port Does This Kubernetes Pod Listen On?
Be a networking Sherlock Holmes - find out which port a Kubernetes app uses and send a request to it.
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Send a Signal to a Kubernetes App: a Slim Container Case
Learn how to send a signal to a Kubernetes app running in a container without shell.