Write a Dockerfile That Excludes Dev Dependencies from the Production Image
Learn how to keep your container images lean by excluding development dependencies (linters, test frameworks, etc.) from the production build.
Submissions: 44/66
Challenges
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.
Official Collection
Challenges crafted by iximiuz Labs to help you master DevOps and Server Side topics.
Write a Dockerfile for an Application With System-Level Dependencies
Practice installing OS-level packages during a Docker image build to satisfy system library requirements of your application.
Submissions: 38/48
Write Your First Dockerfile
Learn the absolute basics of Dockerfile authoring by containerizing a simplistic Node.js server application with just three instructions: FROM, COPY, and CMD.
Submissions: 65/91
Write a Dockerfile for a Simple Web Server Application
Learn how to write a Dockerfile from scratch and build a working container image for a web server application with a simple set of dependencies.
Submissions: 101/156
Challenge, Easy, on
Gracefully Stop a Container With a Lengthy Shutdown Sequence
Learn how to properly stop a Docker container whose application needs more than the default 10 seconds to shut down gracefully.
Submissions: 36/73
Challenge, Easy, on
Docker 101: Pause and Unpause a Containerized Application
Practice pausing and resuming a running container: start a resource-hungry container, pause it, inspect its state, and then unpause it back to life.
Submissions: 369/695
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: 411/683
Challenge, Easy, on
Docker 101: Restart an Application Container on Failure Automatically
Learn how to configure the restart policy for a container so that it restarts automatically on application failure.
Submissions: 379/576
Challenge, Easy, on
Docker 101: List Containers and Identify Running, Successfully Finished, and Crashed Tasks
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.
Submissions: 492/610
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: 495/585