About This Architecture

Multi-AZ three-tier web application on AWS with CloudFront CDN, WAF, and Route 53 distributing traffic across two availability zones. Application tier runs Auto Scaling Groups of EC2 t3.medium instances behind Application Load Balancers in each AZ, while the data tier uses RDS PostgreSQL with primary-replica replication for read scaling and failover. CloudWatch monitors EC2 instances, S3 stores static assets, and NAT Gateways enable outbound connectivity from private subnets. Fork this diagram to customize instance types, subnet ranges, or add additional services like ElastiCache or SQS for your production workload.

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How do I design a highly available three-tier web application on AWS with multi-AZ failover and RDS read replicas?

This diagram shows a production-ready AWS architecture distributing traffic via CloudFront CDN and WAF to Route 53, which routes requests to Application Load Balancers in two availability zones. EC2 Auto Scaling Groups in private subnets handle application logic, while RDS PostgreSQL primary-replica replication across AZs enables read scaling and automatic failover for the data tier.