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Explore the challenges and solutions of managing hundreds of Kubernetes clusters in an on-premise environment at Yahoo! Japan in this 35-minute conference talk. Discover how the company, serving 130 million Japanese users, implements single-tenancy Kubernetes-as-a-Service to ensure security and workload isolation between organizations. Learn about zero-downtime cluster upgrades, extending Kubernetes with Custom Resource Definitions (CRDs) and Webhooks, and gain insights into efficiently managing a large-scale Kubernetes infrastructure with a small team. Understand the practical approaches to multi-tenancy and the motivations behind building an on-premise Kubernetes-as-a-Service solution for various service teams, including payment and e-commerce systems.