Templates/Multi-region API Failover

Multi-region API Failover

Infrastructure

Active-passive multi-region deployment with DNS failover, health checks, and data replication

6 nodes6 connections

Use Case

Mission-critical APIs, financial services, healthcare platforms, global SaaS with SLA requirements

Stack Breakdown

DNS/GLBAPI (multi-region)PostgreSQLHealth Checker

Architecture Layers

1Global Load Balancing

2Regional API Clusters

3Database Replication

4Health Monitoring

Components by Category

infra

DNS / GLBHealth Checker

backend

API (US-East)API (EU-West)

database

DB PrimaryDB Replica

Why This Topology Works

DNS-based routing sends traffic to the nearest healthy region. Async replication keeps the secondary warm. Health checks trigger automatic failover, minimizing downtime to seconds.

Scaling Notes

Each region scales independently. DB replication lag is the RPO constraint. Consider CRDTs or conflict resolution for active-active setups.

Observability

Monitor replication lag, regional latency, health check success rate, and failover event frequency. Synthetic probes from each region.