Scripts and instructions on setting up the Kubernetes cluster on Raspberry Pi. Sharing here to aid anyone else attempting to do the same. I have used Raspberry Pi 4 Model B in my setup as some of the scripts assumes wifi (wlan0) built-in.
Note: This works with Ubuntu 20.04 LTS release. See tag v1.0 for 18.04 LTS release
Step 1 : Download the repo and execute the following commands to substitute with your desired values
# replace your domain search suffix if not sure leave it as loc
find . -type f -exec sed -i 's/YOUR_DOMAIN_SEARCH/loc/g' {} \;
# replace with your internal namesservers or not sure replace with googles 4.4.4.4 & 8.8.8.8
find . -type f -exec sed -i 's/YOUR_NAMESERVERS/4.4.4.4,8.8.8.8/g' {} \;
# replace with your gateway i.e. generally your router ip
find . -type f -exec sed -i 's/YOUR_GATEWAY/192.168.0.1/g' {} \;
# replace with your wireless id
find . -type f -exec sed -i 's/WIRELESS_SSID/awesome.ssid/g' {}\;
# replace with your wireless password
find . -type f -exec sed -i 's/PASSWORD/secret/g' {}\;
# replace with your desired username else leave it as ubuntu
find . -type f -exec sed -i 's/YOUR_USER_NAME/ubuntu/g' {}\;
Above replacements are common for all the devices you want to use this scripts for, while below i.e. hostname needs replacing for each one
# replace with desired hostname for each RPi
find . -type f -exec sed -i 's/HOSTNAME/k8s-master/g' {}\;
Copy your ssh key for passwordless login
cat ~/.ssh/id_rsa.pub >> post_install/id_rsa.pub
Step 2 : Format the SD Card and load the Ubuntu 20.04 image. Mount SD Card and copy the contents from post_flash directory into /writable partition i.e. you are overlaying files on the /etc and /lib
Step 3 : Power on the RPi and wait for a few mins as it will power cycle twice at the end of it you should have your ready k8s node.
Note: Use Linux for ease of mounting the file system after flashing the SD card as /writable partition is ext4 and you have limited support in Windows & macOS for writing on ext4 filesystem