Getting Started with Docker Linting Using GitHub Actions

Linting is a vital part of modern software development, as it helps prevent issues early and improves code quality throughout the development lifecycle. It also makes code easier to read, understand, and maintain. There are several linting tools available in the market, each designed for different purposes. 

One important area where linting plays an important role is containerization. Docker is a widely used tool in modern development, and the Dockerfile is one of its most critical components. Therefore, maintaining a high-quality Dockerfile is crucial for ensuring code quality and identifying potential issues early. This blog explains how to use CI/CD pipeline to perform Docker linting effectively.

Prerequisites:

• Docker file
• Knowledge about GitHub Actions pipelines
• GitHub Account

Log in to GitHub and create a new GitHub Actions pipeline. Select the Haskell Dockerfile Linter workflow to create an action pipeline for Dockerfile linting.

Provide the correct path to the Dockerfile, as shown in the example below, and run the GitHub Actions pipeline

Example:

      - name: Run hadolint

        uses: hadolint/hadolint-action@f988afea3da57ee48710a9795b6bb677cc901183

        with:

          dockerfile: weatherapp/Dockerfile

          format: sarif

          output-file: hadolint-results.sarif

          no-fail: true

Wait until the GitHub Actions pipeline completes. After that, navigate to the Security tab in the GitHub UI and select Code scanning to view the code scanning results.

Click on the code scanning result to view detailed information about the warning.