Multi-region API Failover
InfrastructureStarterSingle teamActive-passive multi-region setup with DNS global load balancer, primary/replica PostgreSQL replication, and automated health-check-driven failover. Use for high-availability APIs with sub-minute RTO.
Recommended for: Mission-critical APIs
Use Case
Mission-critical APIs, financial services, healthcare platforms, global SaaS with SLA requirements
Best Fit Scenarios
- Mission-critical APIs
- Financial services
- Healthcare platforms
Stack Breakdown
Architecture Layers
Components by Category
infra
backend
database
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.
Typical Bottlenecks
- Deployment drift and regional resource saturation
- Service latency and timeout behavior on critical routes
- Write amplification and query contention on primary stores
Async Flow and Reliability
The flow is mostly synchronous. Add queue-backed workers for long-running or failure-prone operations to protect request latency.
Upgrade Path
Begin with a single deployable service and one datastore. Add background workers and dedicated observability as throughput grows.
Operating Envelope
Complexity is marked as Starter with an intended scope of Single team. Use this as a planning baseline before adapting the template to your reliability and team constraints.