Validate your Dockerfile syntax and instructions to ensure your container builds are efficient and error-free. Identify deprecated commands, malformed instructions, and structural issues with real-time feedback before you start the build process.
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Tip
Use 'COPY --from' in multi-stage builds to keep your production images lean and secure.
Did You Know?
Each RUN, COPY, and ADD instruction in a Dockerfile creates a new layer in your final image.
EXPOSE before FROM or invalid command sequencesCOPY and ADD commandsRUN commands that would cause build-time failuresFROM instruction at the start of a stageBest Practice
Always use a .dockerignore file to prevent sensitive files like .env or .git from being copied into the image.
RUN commands using &&USER instruction to run your applications as a non-root userlatestQ: Does this validator check if my base image exists? A: The validator checks the syntax and structure of your instructions but does not attempt to pull external images from registries.
Q: Can I validate multi-stage Dockerfiles? A: Yes, the tool fully supports multi-stage build syntax and validates each stage accordingly.
Q: Does it check for shell script errors inside RUN commands? A: It identifies basic syntax issues, but complex logic inside embedded shell scripts should be verified with a dedicated shell linter.