Part 4: EKS Multi-Cluster Setup

Part 4: EKS Multi-Cluster Setup — Six Clusters Across Two Regions Part of the series: Building a Production-Grade DevSecOps Pipeline on AWS Introduction Why six clusters instead of one? The answer is isolation and resilience: ┌──────────────────────────────────────────────────────────────────────────┐ │ ONE CLUSTER (anti-pattern) │ │ │ │ Dev pods → same etcd as Production pods │ │ A misconfigured dev deployment can consume all cluster resources │ │ Cluster upgrade = every environment goes down simultaneously │ │ Cost visibility: impossible to attribute spend per environment │ └──────────────────────────────────────────────────────────────────────────┘ ┌────────────────────────────────────────────────────────────────────────────┐ │ SIX CLUSTERS (this guide) │ │ │ │ myapp-dev-use1 (us-east-1, public endpoint, 2 nodes) │ │ myapp-dev-usw2 (us-west-2, public endpoint, 2 nodes) │ │ myapp-staging-use1 (us-east-1, private endpoint, 2 nodes) │ │ myapp-staging-usw2 (us-west-2, private endpoint,