Dockerfile Best Practices Linter

Line-by-line Dockerfile review before CI catches it

This tool statically parses a pasted Dockerfile and checks it against real-world best practices developers actually get bitten by: base images pinned to a specific tag instead of :latest, a non-root USER instruction, sensible RUN layer consolidation, .dockerignore reminders for broad COPY patterns, and package manager cache cleanup. Every finding includes the specific line number and a plain-English explanation of why it matters, so you understand the fix, not just the rule.

• →Flags FROM image:latest and untagged base images as reproducibility risks
• →Detects a missing USER instruction so containers don't silently run as root
• →Warns on excessive separate RUN layers and unclean apt-get caches
• →Reminds you to scope COPY . . with a .dockerignore
• →Watermarked by Cikal Studio Labs · Works on any device, no install required