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CONTRIBUTING.md

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Contributing to Docker Documentation

We value documentation contributions from the Docker community. We'd like to make it as easy as possible for you to work in this repository.

Our style guide and instructions on using our page templates and components is available in the contribution section on the website.

The following guidelines describe the ways in which you can contribute to the Docker documentation at https://docs.docker.com/, and how to get started.

Reporting issues

If you encounter a problem with the content, or the site in general, feel free to submit an issue in our GitHub issue tracker. You can also use the issue tracker to raise requests on improvements, or suggest new content that you think is missing or that you would like to see.

Editing content

The website is built using Hugo. The content is primarily Markdown files in the /content directory of this repository (with a few exceptions, see Content not edited here).

The structure of the sidebar navigation on the site is defined in /data/toc.yaml. To rename or change the location of a page in the left-hand navigation, edit the toc.yaml file.

You must fork this repository to create a pull request to propose changes. For more details, see Local setup.

General guidelines

Help make reviewing easier by following these guidelines:

  • Try not to touch a large number of files in a single PR if possible.
  • Don't change whitespace or line wrapping in parts of a file you aren't editing for other reasons. Make sure your text editor isn't configured to automatically reformat the whole file when saving.
  • We use GitHub Actions for testing and creating preview deployments for each pull request. The URL of the preview deployment is added as a comment on the pull request. Check the staging site to verify how your changes look and fix issues, if necessary.

Local setup

You can use Docker (surprise) to build and serve the files locally.

Important

This requires Docker Desktop version 4.24 or later, or Docker Engine with Docker Compose version 2.22 or later.

  1. Fork the docker/docs repository.

  2. Clone your forked docs repository:

    $ git clone https://github.com/<your-username>/docs
$ cd docs

  3. Configure Git to sync your docs fork with the upstream docker/docs repository and prevent accidental pushes to the upstream repository:

    $ git remote add upstream https://github.com/docker/docs.git
$ git remote set-url --push upstream no_pushing

  4. Check out a branch:

    $ git checkout -b <branch>

  5. Start the local development server:

    $ docker compose watch

The site will be served for local preview at http://localhost:1313. The development server watches for changes and automatically rebuilds your site.

To stop the development server:

  1. In your terminal, press <Ctrl+C> to exit the file watch mode of Compose.
  2. Stop the Compose service with the docker compose down command.

Testing

Before you push your changes and open a pull request, we recommend that you test your site locally first. Local tests check for broken links, incorrectly formatted markup, and other things. To run the tests:

$ docker buildx bake validate

If this command doesn't result in any errors, you're good to go!

Content not edited here

CLI reference documentation is maintained in upstream repositories. It's partially generated from code, and is only vendored here for publishing. To update the CLI reference docs, refer to the corresponding repository:

Feel free to raise an issue on this repository if you're not sure how to proceed, and we'll help out.

Other content that appears on the site, but that's not edited here, includes:

  • Dockerfile reference
  • Docker Engine API reference
  • Compose specification
  • Buildx Bake reference

If you spot an issue in any of these pages, feel free to raise an issue here and we'll make sure it gets fixed in the upstream source.