Docker 101: Signal a Running Containerized Application
Practice using UNIX signals with containers for controlling application behavior: Send a SIGUSR1 to a containerized app to trigger its memory usage reporting.
Submissions: 709/1155
Challenges
Focused, hands-on problems for sharpening your DevOps and server-side skills. Some teach specific concepts while others mirror real-world scenarios. Every challenge includes hints, feedback, and automated solution checks.
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.
Submissions: 918/1036
Docker 101: Run a TTY-controlled Container and Explore the Effect of the -t Flag
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.
Submissions: 828/964
Install Docker Engine on Debian
Practice installing Docker on Debian and learn about the different components that make up Docker Engine.
Submissions: 535/659
Install Docker Engine on Fedora
Practice installing Docker on Fedora and learn about the different components that make up Docker Engine.
Submissions: 515/620
Install Docker Engine on Ubuntu
Practice installing Docker on Ubuntu and learn about the different components that make up Docker Engine.
Submissions: 1219/1968
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'?
Submissions: 228/476