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.
Learn how to execute commands inside running containers using 'docker exec' - a crucial skill for debugging containerized applications and exploring container environments.
Discover why host environment variables aren't visible to containers and how to properly pass them to containerized applications in Docker.
Learn how to override a container's default entrypoint to run an interactive shell instead of the intended application, a useful technique for debugging and exploring containerized applications.
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.
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.
Run a few containers from local and Docker Hub-hosted images and experience the most typical use cases of the foreground 'docker run' command.
Bring your understanding of Linux containers to the next level - start an Nginx container performing every main step of the process manually.