Hadolint is an open source Dockerfile linter that enforces best practices, security guidelines, and efficiency rules for container images. It parses Dockerfiles, identifies common mistakes, flags insecure instructions, and recommends improvements such as reducing image layers, pinning versions, avoiding root users, and preventing harmful patterns. Hadolint supports CI integration, shellcheck-based validation, and custom rule configuration. Teams use it to strengthen container hygiene, reduce build-time errors, and align with DevSecOps standards for containerized applications.

DevSecOps in Practice