Kubernetes is being used at eBay to manage their large cloud infrastructure. Some key facts: - eBay's cloud infrastructure manages half a million compute cores across 150,000 servers, 200+ PB of data, and handles billions of queries and downloads daily. - They currently use a traditional IaaS-oriented lifecycle for app platforms, but are moving to Kubernetes for its container-based model, declarative abstractions, and centralized state store. - Challenges in adopting Kubernetes include networking (IP routing, density, multi-tenancy), security (IAM integration, container security), storage (integration with block storage), and scale (currently clusters of 5-20k servers each).