Docker 101: Pass Environment Variables to Containers
Discover why host environment variables aren't visible to containers and how to properly pass them to containerized applications in Docker.
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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.
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 formatting drives in Linux: identify the drive, format it as ext4, mount it, and verify the filesystem works as expected.
Hone your Linux networking skills by setting up routing that lets two isolated private networks communicate.
CTF-style challenge: discover an unmounted device, mount it, and read the flag file from it.
Practice installing Docker on Debian and learn about the different components that make up Docker Engine.
Practice installing Docker on Fedora and learn about the different components that make up Docker Engine.
Practice installing Docker on Ubuntu and learn about the different components that make up Docker Engine.
Test your Linux and Networking skills by identifying which port a service is using. Sounds easy? Perhaps, but be careful - you only get one shot!
Test your Linux and Networking skills by pinpointing a process that is listening on a given port. Sounds easy? Perhaps, but be careful - you only get one shot!