Learn how a small Google team built an air-gapped private cloud platform using open source technologies in this 43-minute conference talk. Discover the implementation process of creating a complete cloud infrastructure featuring managed VMs, databases, and AI services using CNCF technologies like Kubernetes and Istio. Explore the development of cloud tenancy concepts, tenant isolation methods, and cloud API construction using Kubernetes API machinery and service mesh. Gain insights into the innovative "Kubernetes Defined Networking" (KDN) stack, which leverages existing Kubernetes networking features to implement traditional cloud SDN concepts including VPC, firewall, and VM support. Understand both the potential and limitations of these technologies in building a scalable, reliable, and secure cloud platform.