This document discusses running Kubernetes on Raspberry Pi 4 boards to create a low-cost Kubernetes cloud. It describes setting up the infrastructure including an HTTP server, DHCP server, and DNS registry. It then covers building a custom Raspberry Pi 4 kernel, installing it on the boards, and configuring WiFi. Next, it discusses deploying Kubernetes with one master node and two worker nodes. Finally, it demonstrates running a multi-container Tomcat application on the Kubernetes cluster.