In my journey to establish a Highly Available Kubernetes Pi Cluster, I've successfully configured the cluster following an external etcd setup. The process involves installing Docker, setting up the Docker daemon, and installing kubeadm. Initializing Kubernetes Master Nodes, preparing certificates, and configuring Calico for networking are key steps. Troubleshooting tips include addressing refused connections and certificate expiration. To rejoin a faulty node, cordoning, draining, and generating new keys are essential. Now, I proudly own a fully operational Highly Available Kubernetes Pi Cluster.