Let's install Kubernetes on a Raspberry Pi 4 (8Gb).
There is plenty of Kubernetes distributions that work fine on Raspberry. I choose MicroK8s.
First of all, we need to install Snap - the app store for Linux from Canonical. Let's follow the official recommendations:
sudo apt update
sudo reboot
sudo snap install core
Again, there's an official manual for this.
The only thing is that it tells to change sudo vi /boot/firmware/cmdline.txt, but on my Raspberry Pi 4, I found this file in /boot/cmdline.txt.
So, open /boot/cmdline.txt in your editor of choice and add the following at the end of the line: cgroup_enable=memory cgroup_memory=1.
In example:
sudo vi /boot/cmdline.txt
Then, install microk8s:
sudo snap install microk8s --classic --channel=1.25
sudo usermod -a -G microk8s pi
newgrp microk8s
microk8s status
sudo snap install kubectl --classic
sudo chown -f -R pi ~/.kube
microk8s config > ~/.kube/config
The following command will list your pods from all namespaces:
kubectl get pods -A
Now, to connect from another computer, copy ~/.kube/config to your computer and follow the recommendations.
In short, you can either store this file as a separate context file or merge/overwrite it to your ~/.kube/config. If you put it in a separate file, say, ~/.kube/pi-config.yml, you'd need to do one of the following:
kubectl, e.g.: kubectl --kubeconfig ~/.kube/pi-config.yml.$KUBECONFIG environment variable.