Rpi Cluster-er

Originally started as a project to automatically create Rpi OS images that are ssh-able and autoconnect to my home wifi. Let's be more ambitious with this and automate the setup/configuration of a Kubernetes cluster on top of a collection of RPis that I own.

Burning a new OS image

• Depends on rpi-imager and psudo.
• Must download .img file and save to images/ directory.
• Configure by modifying config.yml. Defines the following
  • Location of OS images, and which one to use.
  • Mount points, device name of SD card
  • Location of shadow file on OS, to set the password you want
  • Location of DHCP config file, so you can set whatever static IP address you want
• Run psudo python main.py

todo

• configure install script to add ssh public key specified in config.yml. This is so we can communicate passwordlessly from an ansible control node
• rename the hostname in the install script so they're not all named raspberrypi (k8s yells at me for this)
• ansibilize the installation/setup of kubernetes
• write script that pings me when RPis with >= 4gb RAM are available in stock? Chip shortage means I can't buy them and can't run real k8s :(

k8s notes

• https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-linux-server
• https://opensource.com/article/20/6/kubernetes-raspberry-pi
  • on raspbian buster, edit /boot/cmdline.txt instead of /boot/firmware/cmdline.txt to enable cgroups etc
  • seems that after k8s version 1.24, Docker is no longer supported as a CRI (container runtime engine) `
  • kubelet crashloops until it's given a thing to do?
  • using k8s requires that you disable swap, can be done with sudo swapoff -a
  • can run Lens IDE on my laptop, entirely outside of the cluster, by pointing to a control node in kubeconfig?