A Huge Cluster or Multi-Clusters? Identifying the Bottleneck

This conference talk explores the critical decision between scaling a single Kubernetes cluster to massive sizes versus implementing multi-cluster architectures. Examine the bottlenecks and challenges of large-scale clusters (5,000+ nodes) alongside the complexities of multi-cluster solutions. Discover insights from industry implementations, including Google's 65,000-node cluster using Spanner and ByteDance's multi-tenancy approach with Kubebrain. Learn about API server optimization options, etcd tuning strategies and alternatives like Kubebrain and kine, plus operational considerations including multi-tenancy models (vCluster, kubezoo, HNC) and operator version control. The presentation also covers multi-cluster management solutions such as Karmada and Clusternet, along with networking challenges addressed by tools like Submariner. Gain practical knowledge to determine the most suitable scaling strategy for your specific Kubernetes deployment needs.