Focused hands-on problems designed to help you hone your DevOps or Server Side skills. Some challenges are more educational, while others are based on real-world scenarios. The platform provides hints and feedback for each challenge, including automated solution checks.
Practice listing containers and inspecting their state to identify running, exited, and crashed applications - a vital skill for day-to-day operation of containerized systems.
Discover why host environment variables aren't visible to containers and how to properly pass them to containerized applications in Docker.
Learn when to use the -t flag in 'docker run' to allocate a pseudo-TTY (terminal) for containers, enabling terminal-specific features like cursor control, colors, and signal handling.
Practice sending binary data to a containerized CLI tool - a helpful scripting pattern you'll often find in CI/CD pipelines and other automation jobs.
Practice configuring Kubernetes to pull images from a private registry and run Pods with authenticated registry access.
Practice formatting drives in Linux: identify the drive, format it as ext4, mount it, and verify the filesystem works as expected.
CTF-style challenge: discover an unmounted device, mount it, and read the flag file from it.
Hone your Linux networking skills by setting up routing that lets two isolated private networks communicate.
Some container images include more than one executable file, and you may want to run a container using other than the default command and/or pass some arguments to it. Learn how to do this by solving this challenge.
Practice starting containers in "detached" mode, leaving them running in the background, reading their logs, and re-attaching to them.