Welkin Documentation

This is the main repository for documentation about the Welkin project. For Welkin code, please refer to:

• compliantkubernetes-kubespray for setting up a vanilla Kubernetes cluster on top of a compliant cloud provider;
• compliantkubernetes-apps for augmenting a vanilla Kubernetes cluster with security and observability.

Prerequisites

Python 3. You can check that it is already present on your Linux/macOS as follows:

python3 --version

For generating figures, please install:

sudo apt-get install graphviz make

For generating docs/stylesheets/style.css, please install:

npm install -g sass

Usage

[!NOTE] For Mac users, you might have to install cairo: brew install cairo

To view locally:

python3 -m venv .venv
source .venv/bin/activate
pip3 install -r requirements.txt

mkdocs serve

[!CAUTION] The command mike serve also works to preview a page, but it does not seem to support live preview. This means that you need to restart mike serve after every file change, which is not really productive

• To view locally: mike deploy welkin -t 'main' and then mike serve.
• To re-generate figures: make -C docs/img. For simplicity, please commit generated figures. Prefer PNG (width == 1200px), to facilitate embedded logos.
• For continuous preview of figures: make -C docs/img preview.
• To generate docs/stylesheets/style.css, please use sass extra_sass/style.css.scss > docs/stylesheets/style.css.

Tech Stack

• mkdocs
• mkdocs-material
• GitHub Pages
• Graphviz
• mike
• sass

Deployment

GitHub Actions will deploy the main branch automatically.

Known Issues

nodeenv provided with Ubuntu 24.04 is old

If you get the following errors:

$ pre-commit run --all
[...]
An unexpected error has occurred: CalledProcessError: command: ('/usr/bin/python3', '-mnodeenv', '--prebuilt', '--clean-src', '/home/cklein/.cache/pre-commit/repoxgjtxt_g/node_env-default')
[...]
      File "/usr/lib/python3/dist-packages/nodeenv.py", line 881, in main
        opt.node = get_last_stable_node_version()

                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Then this could be caused by the version of nodeenv delivered with Ubuntu 24.04. You have two options.

Option 1: Run pre-commit from a virtual environment

1. Remove Ubuntu's pre-commit and nodeenv: sudo apt purge nodeenv --autoremove.
2. Activate the virtual environment you created above: . .venv/bin/activate.
3. Install pre-commit in the virtual environment: pip install pre-commit.
4. Run pre-commit from the virtual environment: pre-commit run --all.

Option 2: Break system package

sudo apt install pre-commit
sudo apt install python3-pip
sudo pip install nodeenv --break-system-packages --upgrade