Setup the Raspberry

Install Raspberry OS Lite (without desktop)

https://www.raspberrypi.com/software/

Setup Wi-Fi directly from your SD card

Enable ssh to allow remote login

$ touch /Volumes/boot/ssh

Add your WiFi network info

$ touch /Volumes/boo/wpa_supplicant.conf

Paste the following lines into this file

country=DE # your country code
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="NETWORK-NAME"
    psk="NETWORK-PASSWORD"
}

For more information just visit this page: https://desertbot.io/blog/headless-raspberry-pi-4-ssh-wifi-setup

Setup authorized keys and hostname

1. Log into the Raspberry, create the file ~/.ssh/authorized_keys(if not already present) and add the contents of your public key file (e.g. /.ssh/id_rsa ).

2. You can change the hosfile with the follofing command

   $ sudo raspi-config
   

   Go to System Options > Hostname

Install k3s

Add "cgroup_memory=1 cgroup_enable=memory" to your linux cmdline (/boot/cmdline.txt on a Raspberry Pi) Reboot your Pi

$ sudo reboot

Authenticate and Authorize an External User

https://rancher.com/docs/k3s/latest/en/cluster-access/#accessing-the-cluster-from-outside-with-kubectl