Validators
Dockerfile Validator
Validate Dockerfile syntax and check for best practices and security issues
Validate Dockerfile syntax and check for best practices and security issues
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Tip
Use multi-stage builds to keep your final production images small by excluding build-time dependencies.
Best Practice
Always use specific version tags for base images to ensure your builds are consistent and reproducible.
Did You Know?
The order of instructions in a Dockerfile significantly affects build time due to how Docker caches layers.
Q: Does this validator support Docker BuildKit features? A: Yes, it supports modern syntax and instructions introduced with the BuildKit backend.
Q: Why is my FROM instruction being flagged? A: Ensure it is the first non-comment instruction and that the image name follows the standard registry format.
Q: Can it detect security vulnerabilities in images? A: It focuses on syntax and configuration best practices; for image vulnerability scanning, use specialized tools like Docker Scout.
Tip
A .dockerignore file can dramatically reduce build time by excluding unnecessary files from the build context.