Kubernetes - Build and Deploy a Production-Ready Container Image
Combine multi-stage builds, build-time arguments, non-root users, and Pod security context into a single production-grade image pipeline.
Submissions: 17/28
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.
Challenge, Medium, on
Squash a Bloated Container Image to Remove Waste and Leaked Credentials
A poorly structured Docker image contains leftover build dependencies and leaked private registry credentials hiding in its intermediate layers. Squash the image to produce a clean, compact version with the same runtime filesystem.
Submissions: 42/60
Challenge, Medium, on
Use Docker Build Arguments to Inject Version and Commit Metadata into a Go Binary
Practice using Docker build arguments to inject version and commit metadata into a Go application during the image build.
Submissions: 87/102
Install a Private npm Package in a Dockerfile Without Leaking Credentials
Build a container image for a Node.js app that uses a private npm package without leaking the registry credentials into the image layers.
Submissions: 34/57
Challenge, Medium, on
Write a Dockerfile for a Containerized CLI Tool
Write a Dockerfile for a simple CLI tool and learn how to use the ENTRYPOINT instruction to improve the user experience of containerized command-line applications.
Submissions: 96/125
Challenge, Medium, on
Write a Dockerfile with Sensible Runtime Defaults
Write a Dockerfile for a simple web service and learn how Docker images can improve the application startup UX by defining sensible runtime defaults using ENV, USER, and STOPSIGNAL instructions.
Submissions: 90/105
Optimize Container Images with Multi-Stage Builds
Practice optimizing applications' container images using multi-stage builds. Rewrite single-stage Dockerfiles for a Go backend and a TypeScript frontend to produce smaller, production-ready images without unnecessary build tools and dev dependencies.
Submissions: 137/225
Challenge, Medium, on
Build and Inspect a Container Image With Docker
Build a container image from a Dockerfile and use Docker commands to inspect its size and layer composition.
Submissions: 136/233
Build and Compile Applications in Dockerfiles
Practice building and compiling applications inside their Dockerfiles by containerizing a Go backend and a TypeScript frontend.
Submissions: 154/246
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: 220/286