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    README.md

    Creating and updating the Kubeflow docs

    Welcome to the GitHub repository for Kubeflow's public website. The docs are hosted at https://www.kubeflow.org.

    We use Hugo to format and generate our website, the Docsy theme for styling and site structure, and Netlify to manage the deployment of the site. Hugo is an open-source static site generator that provides us with templates, content organization in a standard directory structure, and a website generation engine. You write the pages in Markdown, and Hugo wraps them up into a website.

    Quickstart

    Here's a quick guide to updating the docs. It assumes you're familiar with the GitHub workflow and you're happy to use the automated preview of your doc updates:

    1. Fork the kubeflow/website repository on GitHub.
    2. Make your changes and send a pull request (PR).
    3. If you're not yet ready for a review, add "WIP" to the PR name to indicate it's a work in progress. Alternatively, you can also add /hold in a comment to mark the PR as not ready for merge. (Don't add the Hugo property "draft = true" to the page front matter, because that prevents the auto-deployment of the content preview described in the next point.) See the Prow guide for help with the commands that you can use in a PR comment.
    4. Wait for the automated PR workflow to do some checks. When it's ready, you should see a comment like this: deploy/netlify — Deploy preview ready!
    5. Click Details to the right of "Deploy preview ready" to see a preview of your updates.
    6. Continue updating your doc and pushing your changes until you're happy with the content.
    7. When you're ready for a review, add a comment to the PR, remove any holds or "WIP" markers, and assign a reviewer/approver. See the Kubeflow contributor guide.

    If you need more help with the GitHub workflow, follow this guide to a standard GitHub workflow.

    Previewing your changes on a local website server

    If you'd like to preview your doc updates as you work, you can install Hugo and run a local server to host your website. This section shows you how.

    Install Hugo and other dependencies

    You need Hugo version 0.60 or later, and it must be the extended version of Hugo. Hugo version 0.60 and later support the Goldmark renderer for Markdown. Goldmark offers improved rendering of some text formatting such as lists.

    Note: From April 2020 onwards, Kubeflow recommends that you use Hugo version 0.68.3 or later. The Kubeflow website now uses Hugo 0.68.3 via Netlify.

    To get the latest extended version of Hugo:

    1. Go to the Hugo releases page.
    2. In the most recent release, scroll down until you find a list of extended versions.
    3. Download the relevant file for your operating system.
    4. Unzip the downloaded file into a location of your choice.

    For example, to install Hugo on Linux:

    1. Download hugo_extended_0.68.3_Linux-64bit.tar.gz (or the latest version) from the Hugo releases page.

    2. Create a new directory:

      mkdir $HOME/hugo
    3. Extract the file you downloaded to $HOME/hugo.

      tar -zxvf hugo_extended_0.68.3_Linux-64bit.tar.gz

    For more details about installing Hugo, See the Hugo installation guide.

    If you plan to make changes to the site styling, you need to install some CSS libraries as well. Follow the instructions in the Docsy theme's setup guide.

    Fork and clone the website repository and run a local website server

    Follow the usual GitHub workflow to fork the repository on GitHub and clone it to your local machine, then use your local repository as input to your Hugo web server:

    1. Fork the kubeflow/website repository in the GitHub UI.

    2. Clone your fork locally. This example uses SSH cloning:

      mkdir kubeflow
      cd kubeflow/
      git clone git@github.com:<your-github-username>/website.git
      cd website/
    3. Start your website server. Make sure you run this command from the /website/ directory, so that Hugo can find the config files it needs:

      hugo server -D
    4. You can access your website at http://localhost:1313/ (bind address 127.0.0.1)

    5. Continue with the usual GitHub workflow to edit files, commit them, push the changes up to your fork, and create a pull request. (There's some help with the GitHub workflow near the bottom of this page.)

    6. While making the changes, you can preview them on your local version of the website at http://localhost:1313/. Note that if you have more than one local Git branch, when you switch between Git branches the local website reflects the files in the current branch.

    Useful docs:

    Menu structure

    The site theme has one Hugo menu (main), which defines the top navigation bar. You can find and adjust the definition of the menu in the site configuration file.

    The left-hand navigation panel is defined by the directory structure under the docs directory.

    A weight property in the front matter of each page determines the position of the page relative to the others in the same directory. The lower the weight, the earlier the page appears in the section. A weight of 1 appears before a a weight of 2, and so on. For example, see the front matter of the Getting Started with Kubeflow page. The page front matter looks like this:

    +++
    title = "Getting Started with Kubeflow"
    description = "Overview"
    weight = 1
    +++

    Working with the theme

    The theme files are in the themes/docsy directory. Do not change these files, because they are overwritten each time we update the website to a later version of the theme, and your changes will be lost.

    Documentation style guide

    For guidance on writing effective documentation, see the style guide for the Kubeflow docs.

    Styling your content

    The theme holds its styles in the assets/scss directory. Do not change these files, because they are overwritten each time we update the website to a later version of the theme, and your changes will be lost.

    You can override the default styles and add new ones:

    • In general, put your files in the project directory structure under website rather than in the theme directory. Use the same file name as the theme does, and put the file in the same relative position. Hugo looks first at the file in the main project directories, if present, then at the files under the theme directory. For example, the Kubeflow website's layouts/partials/navbar.html overrides the theme's layouts/partials/navbar.html.
    • You can update the Kubeflow website's project variables in the _variables_project.scss file. Values in that file override the Docsy variables. You can also use _variables_project.scss to specify your own values for any of the default Bootstrap 4 variables.

    Styling of images:

    The site's front page:

    Using Hugo shortcodes

    Sometimes it's useful to define a snippet of information in one place and reuse it wherever we need it. For example, we want to be able to refer to the minimum version of various frameworks/libraries throughout the docs, without causing a maintenance nightmare.

    For this purpose, we use Hugo's "shortcodes". Shortcodes are similar to Django variables. You define a shortcode in a file, then use a specific markup to invoke the shortcode in the docs. That markup is replaced by the content of the shortcode file when the page is built.

    To create a shortcode:

    1. Add an HTML file in the /website/layouts/shortcodes/ directory. The file name must be short and meaningful, as it determines the shortcode you and others use in the docs.

    2. For the file content, add the text and HTML markup that should replace the shortcode markup when the web page is built.

    To use a shortcode in a document, wrap the name of the shortcode in braces and percent signs like this:

    {{% shortcode-name %}}

    The shortcode name is the file name minus the .html file extension.

    Example: The following shortcode defines the minimum required version of Kubernetes:

    • File name of the shortcode:

      kubernetes-min-version.html
    • Content of the shortcode:

      1.8
    • Usage in a document:

      You need Kubernetes version {{% kubernetes-min-version %}} or later.

    Useful Hugo docs:

    Versioning of the docs

    For each stable release, we create a new branch for the relevant documentation. For example, the documentation for the v0.2 stable release is maintained in the v0.2-branch. Each branch has a corresponding Netlify website that automatically syncs each merged PR.

    The versioned sites follow this convention:

    • www.kubeflow.org always points to the current master branch
    • master.kubeflow.org always points to GitHub head
    • vXXX-YYY.kubeflow.org points to the release at vXXX.YYY-branch

    We also hook up each version to the dropdown on the website menu bar. For information on how to update the website to a new version, see the Kubeflow release guide.

    Whenever any documents reference any source code, you should use the version shortcode in the links, like so:

    https://github.com/kubeflow/kubeflow/blob/{{< params "githubbranch" >}}/scripts/gke/deploy.sh

    This ensures that all the links in a versioned webpage point to the correct branch.

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