pi-imager's Introduction

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?

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