Zero-Downtime Infrastructure Migration with Kubernetes & Terraform

## Infrastructure as Code & Immutable Architecture When scaling microservices, manual cloud console adjustments create configuration drift. Codifying your entire cloud topology into declarative Terraform modules ensures repeatability and instant auditability. ### The Blue-Green Cloud Strategy - **DNS Level Traffic Shifting**: Route a small percentage of edge traffic (5%) to the new Kubernetes cluster. - **Real-time Observability**: Monitor error spikes using Prometheus metrics before ramping traffic to 100%. - **Database Replication**: Maintain bi-directional replication between legacy and cloud database nodes until cutover.