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README.md

Giant Swarm User Documentation

This is the main documentation repository for the documentation available at https://docs.giantswarm.io.

Repository overview

This repository named docs holds the main content of our documentation. The documentation site is created using the static site generator HUGO based on Markdown files in the src/content/ directory. Images are in the src/static/img/ directory.

Additional content repositories are tied in through the file src/external-repositories.txt.

We welcome any contributions on content to this repository in the form of pull requests!

The src/ directory also contains HTML templates and the HUGO site configuration.

The build process here in the Makefile and the Dockerfile pull together the content from this and the external repositories, and create a Docker container serving a the documentation website.

There are several additional repositories which provide additional functionality:

  • docs-proxy: nginx proxy server which integrates the search engine and the API spec (see below) into the documentation site, and provides some additional configuration, e. g. regarding HTTP headers.

  • api-spec: Specification (in Swagger/OpenAPI) format for the Giant Swarm API. Available in the docs site under https://docs.giantswarm.io/api/.

  • sitesearch: Search engine for the documentation site.

  • indexer: Indexing tool that pushes new content to the sitesearch index periodically, to keep the search engine up-to-date.

Editing content

Edit existing content in the src/content folder or in the external repositories (see src/external-repositories.txt).

Front matter

Each documentation page consists of a Markdown file that starts with some metadata called front matter. Some hints:

  • Please look at the other pages to get an idea of what the front matter is good for.

  • Please always update the last modification date of the page when you change content.

  • Please double-check whether the page description is still up-to-date or could be improved.

Code blocks

We support fenced code blocks wrapped by the triple backtick operator. It is recommended to also declare the language a code snippet uses, to prevent faulty guessing. Example:

```json
{"message": "this is JSON"}
```

Shell snippets (commands and their output) should in generall prevent highlighting like this:

```nohighlight
$ ls
bar    foo
```

Table of contents and headline anchors

The rendered documentation pages will have a table of contents on the top left and an achor for every intermediate headline. This anchor is normally generated from the headline's content. For example, a headline

### Another section with more content

will result in a headline

<h3 id="another-section-with-more-content">Another section with more content</h3>

This means that anchors and URLs can become quite long. It also means that when the healine text changes, all links to this headline also have to be updated.

To control this behaviour, the anchor ID can be edited as a suffix to the markdown headline, like in the following example:

### Another section with more content {#more}

will result in a headline

<h3 id="more">Another section with more content</h3>

Shortcodes

Shortcodes allow the use of a string in any number of places in the docs, while maintaining it only in one place. We use these to place, for example, configuration details.

The goal here is to give users accurate, complete and up-to-date information.

Shortcodes exist as one file each in the folder src/layouts/shortcodes.

Usage

A shortcode can only be placed in Markdown text. The file name (without .html suffix) is used as a placeholder, wrapped in a certain way, like {{% placeholder %}}.

For example, to place the shortcode from first_aws_autoscaling_version.html, the content would look like this

... since version {{% first_aws_autoscaling_version %}} and ...

and would get rendered like

... since version 6.3.0 ...

List of shortcodes with explanation

  • autoscaler_utilization_threshold: Utilization threshold for the kubernetes autoscaler, including percent unit, as we configure it by default. Below this utilization, the autoscaler will consider a node underused and will scale down.

  • default_aws_instance_type: The AWS EC2 instance type we use by default for worker nodes.

  • default_cluster_size_worker_nodes: The default number of worker nodes we use when a cluster is created without specifying a number.

  • first_aws_autoscaling_version: The release version that introduced autoscaling for AWS.

  • minimal_supported_cluster_size_worker_nodes: The minimum number of worker nodes a cluster must have in order to be supported by Giant Swarm.

Previewing changes

You can bring up the site using the following commands:

make docker-build
make docker-run

You can access the server at http://localhost:8080/. The server can be stopped by hitting Ctrl + C.

To run the site locally together with search (sitesearch) and API docs (api-spec), you can use the docker-compose setup provided in the file docker-compose.yaml.

Contributing

This repository is public to facilitate content quality and encourage contributions. We appreciate all contributions, including corrections and suggestions for improvement.

The best way to contribute changes are pull requests. Please note the following regarding pull requests:

  • Please make one pull request per topic/issue. Avoid putting several non-related issues in a single pull request!

  • When creating a pull request, please remember you accept that your contribution will be published under the Creative Commons referenced below. Giant Swarm will be able to use your content without restriction. Giant Swarm is not obliged to list you as the author of your contribution, but will attempt to do so where possible.

Style

We use Title Case for the main article headline, but not for lower level headlines.

For code blocks, we give language hints to ensure proper syntax highlighting. A YAML block, for example, is opened with triple backticks followed by yaml.

However, shell commands and their output get the fake hint nohighlight to prevent any funky syntax highlighting.

Shell commands in code blocks are prepended with a $ (dollar sign and one blank character).

We use long-form CLI flags and avoid the possible equal sign between flag name and value, for best readability.

Right:

$ gsctl create cluster --owner acme

Wrong:

$ gsctl create cluster --owner=acme
$ gsctl create cluster -o=acme
$ gsctl create cluster -o acme

License

The content in this repository is licensed under the Creative Commons Attribution ShareAlike license.

For attribution, please use either:

  • Giant Swarm
  • giantswarm.io

and link, if possible, to https://giantswarm.io

Deploying

With every push to master, the latest content is automatically published. See .circleci/config.yml and helm/ for details.

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