The latest articles on DEV Community by Fábio C. Barrionuevo da Luz (@luzfcb). https://dev.to/luzfcb https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F347077%2F70584a6c-3c51-48f5-b7f2-7be536ebd366.jpeg https://dev.to/luzfcb en Fábio C. Barrionuevo da Luz Tue, 28 Apr 2020 17:08:40 +0000 https://dev.to/feldroy/a-quick-way-to-detect-bad-practices-on-a-dockerfile-41dl https://dev.to/feldroy/a-quick-way-to-detect-bad-practices-on-a-dockerfile-41dl <p>In Feldroy we use Docker images as the base to running the tools to build the PDF, EPUB, and Kindle files from the content written by <a class="comment-mentioned-user" href="https://dev.to/audreyfeldroy">@audreyfeldroy</a> and <a class="comment-mentioned-user" href="https://dev.to/danielfeldroy">@danielfeldroy</a> .</p> <p>Having a 100% functional Dockerfile that follows good practices is a good thing to have.</p> <p>The <a href="https://hadolint.github.io/hadolint/"><code>hadolint</code></a> is a linter tool that helps to validate a Dockerfile to build Docker images that follow the recommendations of the <a href="https://docs.docker.com/develop/develop-images/dockerfile_best-practices/"><code>Best practices for writing Dockerfiles</code></a> guide.</p> <h2> A quick way to use </h2> <div class="highlight"><pre class="highlight plaintext"><code>docker run --rm -i hadolint/hadolint &lt; Dockerfile </code></pre></div> <h2> What is the validation rules </h2> <p>The validation follows these rules: <a href="https://github.com/hadolint/hadolint#rules">https://github.com/hadolint/hadolint#rules</a></p> <h2> How to customize the validation </h2> <p>We can customize the validation by creating the <code>.hadolint.yaml</code> file: <a href="https://github.com/hadolint/hadolint#configure">https://github.com/hadolint/hadolint#configure</a></p> <h2> How to integrate on the CI Server </h2> <p>There are several examples of how to use <code>hadolint</code> on <code>CI servers</code>: <a href="https://github.com/hadolint/hadolint/blob/master/docs/INTEGRATION.md">https://github.com/hadolint/hadolint/blob/master/docs/INTEGRATION.md</a></p> todayilearned docker dockerfile lint