About This Architecture

Multi-AZ three-tier web application on AWS with Route 53 DNS, CloudFront CDN, WAF, and Shield protecting traffic through an Internet Gateway to Application Load Balancers. Auto Scaling Groups of EC2 t3.medium instances in private subnets across AZ-1 and AZ-2 connect to RDS PostgreSQL primary and read replica databases, ElastiCache clusters, DynamoDB, and S3 for stateless, scalable workloads. This architecture demonstrates AWS best practices for high availability, fault tolerance, and disaster recovery by distributing compute and data resources across multiple availability zones with automated failover. Fork this diagram on Diagrams.so to customize VPC CIDR blocks, instance types, or add additional services like Lambda or API Gateway. The read replica and multi-AZ deployment ensure RPO and RTO targets are met while optimizing costs through intelligent caching and auto-scaling policies.

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How do I design a highly available three-tier web application on AWS across multiple availability zones with RDS read replicas?

This diagram shows a production-ready AWS architecture using Route 53 for DNS, CloudFront with WAF and Shield for edge protection, Application Load Balancers distributing traffic to auto-scaled EC2 instances in private subnets across AZ-1 and AZ-2. RDS PostgreSQL primary and read replica databases, ElastiCache clusters, and DynamoDB provide resilient data persistence and caching, while Secrets Man