This project is a highly opinionated automation for kubernetes running on 2 or more raspberry pis.

The setup is glued together using:

• ubuntu for raspberry pi
• cloud-init (built into ubuntu image)
• k3s kubernetes cluster
• zerotier virtual peer to peer network (for accessing remotely)

The scripts in this repo are used to generate configuration needed for a fully automated kubernetes cluster of raspberry pis, and to then flash this to sd card.

The main requirement on top of a macos userspace is flash and yq. Both can be installed with Homebrew. Finally, if you want to use the zerotier integration, make sure you have an account and a network before starting.

create a file called config.yaml by copying the config.yaml.example file and replacing at least the following keys:

• user.username - Your chosen username
• user.sshPubKey - Your SSH public key
• user.passwordHash - a password hash in a crypt compatible format.
• zerotier_network - Your zerotier network (or remove the line from config if not desired)
• token - this is a token for your k3s cluster communication. Make it up, but securely. I used pwgen -s 32
• flux.token - your github pat token
• flux.owner - your github username
• flux.repository - your github repository

But review all the values in the config file. Note: some are optional (such as flux and zerotier_network). The default setup here is for a 4 node cluster, with 1 acting as controlplane

then run ./flash_kubernetes_image.sh node_name with your sdcard inserted. follow the prompts, wait until it's finished and repeat for all your node sdcards.

Finally, insert the cards in each raspberrypi and turn it on.

While there is a certain amount that is configurable, it is mostly an illusion - I use this to make a reproducable test environment for myself and is not tested under other circumstances.

I recommend testing out any non-default configuration as it stands a high chance of not working, and I welcome prs to tidy this up and make it better.