Building Multi-Region Active-Active Architectures with CloudFront VPC origins and Advanced Routing

This article demonstrates how to build multi-region active-active architectures using CloudFront VPC origins with three routing strategies and automated failover for improved performance and resilience.

• CloudFront VPC origins enable direct connectivity to private resources without exposing them to the public internet
• Geo-based routing directs requests to the nearest backend region based on viewer location
• Weighted routing provides operational control over traffic distribution across regions for migrations and A/B testing
• Session affinity routing maintains user requests to the same region for stateful applications and data consistency
• Origin Groups provide automatic failover with configurable error conditions and timeout thresholds
• CloudFront KeyValueStore externalizes routing configurations for real-time updates without function redeployment
• CloudFront Functions implement routing logic at edge locations with custom logging for observability
• Real-time access logs and CloudWatch alarms enable monitoring of routing decisions, failover events, and function errors

This architecture reduces origin latency, enables flexible traffic management, and maintains session consistency while providing automated failover protection during regional events.