About the Dockerfile Linter

Check a Dockerfile for common mistakes and bad practices.

How to use the Dockerfile Linter

1. Paste your code into the input box, or click Sample to load an example.
2. Press Process / Generate.
3. Use Copy (or Download where shown) to keep the result. Clear empties the box.

Tips

• Pin image versions instead of using :latest.
• Combine related RUN commands to keep images smaller.
• Do not store secrets in a Dockerfile.