About Dockerfile Watch

Dockerfile Watch shows you a realistic Dockerfile snippet and asks you to pick the most dangerous or non-reproducible line. Every day everyone gets the same challenge so you can compare results. Topics include :latest tags, running as root, leaking secrets in ENV/ARG, unsafe curl | sh chains, missing layer cleanup, and more.

Why it helps

• Build intuition for the most common Dockerfile security and reproducibility pitfalls.
• Learn how small authoring choices affect image size, caching, and runtime privilege.
• Use the related Dockerfile Linter & Best Practice Checker to audit the full file.

Runs locally in your browser. Progress is stored only in this browser.