Hadolint

GPL-3.0 AST Dockerfile linter + ShellCheck on RUN

DevOps / Security · GPL-3.0 · 12.5k

Reviewed 2026-09-14 · last push 2026-10-14 · repo checked 2026-10-19

What's Good

GPL-3.0. hadolint/hadolint. Parses Dockerfiles into an AST, applies DL#### rules, and runs ShellCheck on `RUN` shell. Online try-out at hadolint.github.io/hadolint; source github.com/hadolint/hadolint.

The Catch

GPL-3.0 copyleft — same class as ShellCheck; not MIT. Vs Docker (the engine), dive (*layer/size forensics*), and lazydocker (Docker/Compose *TUI*): Hadolint is the *Dockerfile linter*, not a runtime, not layer diffs, not a container dashboard.

Verdict

GPL-3.0 Dockerfile linter. Free forever; lint the recipe, dive the layers, lazydocker the running boxes.

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