# Docker Documentation The source for Docker documentation is in this directory under `sources/`. Our documentation uses extended Markdown, as implemented by [MkDocs](http://mkdocs.org). The current release of the Docker documentation resides on [https://docs.docker.com](https://docs.docker.com). ## Understanding the documentation branches and processes Docker has two primary branches for documentation: | Branch | Description | URL (published via commit-hook) | |----------|--------------------------------|------------------------------------------------------------------------------| | `docs` | Official release documentation | [https://docs.docker.com](https://docs.docker.com) | | `master` | Merged but unreleased development work | [http://docs.master.dockerproject.org](http://docs.master.dockerproject.org) | Additions and updates to upcoming releases are made in a feature branch off of the `master` branch. The Docker maintainers also support a `docs` branch that contains the last release of documentation. After a release, documentation updates are continually merged into `master` as they occur. This work includes new documentation for forthcoming features, bug fixes, and other updates. Docker's CI system automatically builds and updates the `master` documentation after each merge and posts it to [http://docs.master.dockerproject.org](http://docs.master.dockerproject.org). Periodically, the Docker maintainers update `docs.docker.com` between official releases of Docker. They do this by cherry-picking commits from `master`, merging them into `docs`, and then publishing the result. In the rare case where a change is not forward-compatible, changes may be made on other branches by special arrangement with the Docker maintainers. ### Quickstart for documentation contributors If you are a new or beginner contributor, we encourage you to read through the [our detailed contributors guide](https://docs.docker.com/project/who-written-for/). The guide explains in detail, with examples, how to contribute. If you are an experienced contributor this quickstart should be enough to get you started. The following is the essential workflow for contributing to the documentation: 1. Fork the `docker/docker` repository. 2. Clone the repository to your local machine. 3. Select an issue from `docker/docker` to work on or submit a proposal of your own. 4. Create a feature branch from `master` in which to work. By basing from `master` your work is automatically included in the next release. It also allows docs maintainers to easily cherry-pick your changes into the `docs` release branch. 4. Modify existing or add new `.md` files to the `docs/sources` directory. If you add a new document (`.md`) file, you must also add it to the appropriate section of the `docs/mkdocs.yml` file in this repository. 5. As you work, build the documentation site locally to see your changes. The `docker/docker` repository contains a `Dockerfile` and a `Makefile`. Together, these create a development environment in which you can build and run a container running the Docker documentation website. To build the documentation site, enter `make docs` at the root of your `docker/docker` fork: $ make docs .... (lots of output) .... docker run --rm -it -e AWS_S3_BUCKET -p 8000:8000 "docker-docs:master" mkdocs serve Running at: http://0.0.0.0:8000/ Live reload enabled. Hold ctrl+c to quit. The build creates an image containing all the required tools, adds the local `docs/` directory and generates the HTML files. Then, it runs a Docker container with this image. The container exposes port 8000 on the localhost so that you can connect and see your changes. If you are running Boot2Docker, use the `boot2docker ip` to get the address of your server. 6. Check your writing for style and mechanical errors. Use our [documentation style guide](https://docs.docker.com/project/doc-style/) to check style. There are several [good grammar and spelling online checkers](http://www.hemingwayapp.com/) that can check your writing mechanics. 7. Squash your commits on your branch. 8. Make a pull request from your fork back to Docker's `master` branch. 9. Work with the reviewers until your change is approved and merged. ### Debugging and testing If you have any issues you need to debug, you can use `make docs-shell` and then run `mkdocs serve`. You can use `make docs-test` to generate a report of missing links that are referenced in the documentation—there should be none. ## Style guide If you have questions about how to write for Docker's documentation, please see the [style guide](sources/project/doc-style.md). The style guide provides guidance about grammar, syntax, formatting, styling, language, or tone. If something isn't clear in the guide, please submit an issue to let us know or submit a pull request to help us improve it. ## Publishing documentation (for Docker maintainers) To publish Docker's documentation you need to have Docker up and running on your machine. You'll also need a `docs/awsconfig` file containing the settings you need to access the AWS bucket you'll be deploying to. The process for publishing is to build first to an AWS bucket, verify the build, and then publish the final release. 1. Have Docker installed and running on your machine. 2. Ask the core maintainers for the `awsconfig` file. 3. Copy the `awsconfig` file to the `docs/` directory. The `awsconfig` file contains the profiles of the S3 buckets for our documentation sites. (If needed, the release script creates an S3 bucket and pushes the files to it.) Each profile has this format: [profile dowideit-docs] aws_access_key_id = IHOIUAHSIDH234rwf.... aws_secret_access_key = OIUYSADJHLKUHQWIUHE...... region = ap-southeast-2 The `profile` name must be the same as the name of the bucket you are deploying to. 4. Call the `make` from the `docker` directory. $ make AWS_S3_BUCKET=dowideit-docs docs-release This publishes _only_ to the `http://bucket-url/v1.2/` version of the documentation. 5. If you're publishing the current release's documentation, you need to also update the root docs pages by running $ make AWS_S3_BUCKET=dowideit-docs BUILD_ROOT=yes docs-release ### Errors publishing using Boot2Docker Sometimes, in a Boot2Docker environment, the publishing procedure returns this error: Post http:///var/run/docker.sock/build?rm=1&t=docker-docs%3Apost-1.2.0-docs_update-2: dial unix /var/run/docker.sock: no such file or directory. If this happens, set the Docker host. Run the following command to set the variables in your shell: $ eval "$(boot2docker shellinit)" ## Cherry-picking documentation changes to update an existing release. Whenever the core team makes a release, they publish the documentation based on the `release` branch. At that time, the `release` branch is copied into the `docs` branch. The documentation team makes updates between Docker releases by cherry-picking changes from `master` into any of the documentation branches. Typically, we cherry-pick into the `docs` branch. For example, to update the current release's docs, do the following: 1. Go to your `docker/docker` fork and get the latest from master. $ git fetch upstream 2. Checkout a new branch based on `upstream/docs`. You should give your new branch a descriptive name. $ git checkout -b post-1.2.0-docs-update-1 upstream/docs 3. In a browser window, open [https://github.com/docker/docker/commits/master]. 4. Locate the merges you want to publish. You should only cherry-pick individual commits; do not cherry-pick merge commits. To minimize merge conflicts, start with the oldest commit and work your way forward in time. 5. Copy the commit SHA from GitHub. 6. Cherry-pick the commit. $ git cherry-pick -x fe845c4 7. Repeat until you have cherry-picked everything you want to merge. 8. Push your changes to your fork. $ git push origin post-1.2.0-docs-update-1 9. Make a pull request to merge into the `docs` branch. Do __NOT__ merge into `master`. 10. Have maintainers review your pull request. 11. Once the PR has the needed "LGTMs", merge it on GitHub. 12. Return to your local fork and make sure you are still on the `docs` branch. $ git checkout docs 13. Fetch your merged pull request from `docs`. $ git fetch upstream/docs 14. Ensure your branch is clean and set to the latest. $ git reset --hard upstream/docs 15. Copy the `awsconfig` file into the `docs` directory. 16. Make the beta documentation $ make AWS_S3_BUCKET=beta-docs.docker.io BUILD_ROOT=yes docs-release 17. Open [the beta website](http://beta-docs.docker.io.s3-website-us-west-2.amazonaws.com/) site and make sure what you published is correct. 19. When you're happy with your content, publish the docs to our live site: $ make AWS_S3_BUCKET=docs.docker.com BUILD_ROOT=yes DISTRIBUTION_ID=C2K6......FL2F docs-release 20. Test the uncached version of the live docs at [http://docs.docker.com.s3-website-us-east-1.amazonaws.com/] ### Caching and the docs New docs do not appear live on the site until the cache (a complex, distributed CDN system) is flushed. The `make docs-release` command flushes the cache _if_ the `DISTRIBUTION_ID` is set to the Cloudfront distribution ID. The cache flush can take at least 15 minutes to run and you can check its progress with the CDN Cloudfront Purge Tool Chrome app. ## Removing files from the docs.docker.com site Sometimes it becomes necessary to remove files from the historical published documentation. The most reliable way to do this is to do it directly using `aws s3` commands running in a docs container: Start the docs container like `make docs-shell`, but bind mount in your `awsconfig`: ``` docker run --rm -it -v $(CURDIR)/docs/awsconfig:/docs/awsconfig docker-docs:master bash ``` and then the following example shows deleting 2 documents from s3, and then requesting the CloudFlare cache to invalidate them: ``` export BUCKET BUCKET=docs.docker.com export AWS_CONFIG_FILE=$(pwd)/awsconfig aws s3 --profile $BUCKET ls s3://$BUCKET aws s3 --profile $BUCKET rm s3://$BUCKET/v1.0/reference/api/docker_io_oauth_api/index.html aws s3 --profile $BUCKET rm s3://$BUCKET/v1.1/reference/api/docker_io_oauth_api/index.html aws configure set preview.cloudfront true export DISTRIBUTION_ID=YUTIYUTIUTIUYTIUT aws cloudfront create-invalidation --profile docs.docker.com --distribution-id $DISTRIBUTION_ID --invalidation-batch '{"Paths":{"Quantity":1, "Items":["/v1.0/reference/api/docker_io_oauth_api/"]},"CallerReference":"6Mar2015sventest1"}' aws cloudfront create-invalidation --profile docs.docker.com --distribution-id $DISTRIBUTION_ID --invalidation-batch '{"Paths":{"Quantity":1, "Items":["/v1.1/reference/api/docker_io_oauth_api/"]},"CallerReference":"6Mar2015sventest1"}' ``` ### Generate the man pages For information on generating man pages (short for manual page), see [the man page directory](https://github.com/docker/docker/tree/master/docker) in this project.