About This Architecture

AWS SOA three-tier multi-AZ architecture spans two availability zones with CloudFront CDN, AWS WAF, and Route 53 protecting the edge, while an Application Load Balancer distributes traffic to EC2 t3.medium and ECS Fargate compute instances across public and private subnets. Application tier services connect to RDS Primary and Standby databases in separate AZs for synchronous workloads, with DynamoDB and replicas handling NoSQL data and Lambda functions processing asynchronous jobs via SQS queues. CloudWatch and IAM provide observability and access control across the entire stack, ensuring fault tolerance, auto-failover, and compliance with AWS Well-Architected Framework principles. Fork this diagram on Diagrams.so to customize subnets, instance types, or add additional services like ElastiCache or Kinesis. This architecture demonstrates production-grade resilience patterns ideal for mission-critical applications requiring RTO/RPO guarantees and multi-AZ redundancy.

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How do I design a highly available three-tier AWS application that survives availability zone failures?

This diagram shows a production-grade multi-AZ architecture where CloudFront and AWS WAF protect the edge, Route 53 and ALB distribute traffic across two AZs, and RDS Primary/Standby plus DynamoDB replicas ensure data durability. EC2, ECS Fargate, and Lambda handle compute across private subnets with NAT gateways for outbound access, while CloudWatch and IAM provide monitoring and security.