About This Architecture

Three-tier web application architecture on AWS spans two availability zones (us-east-1a, us-east-1b) with CloudFront CDN, WAF, and Route 53 handling global traffic distribution and security. Application Load Balancer distributes requests across EC2 t3.medium instances in private subnets managed by Auto Scaling Groups, while RDS PostgreSQL primary and read replica in separate AZs provide high-availability data persistence. Static assets serve from S3 through CloudFront, NAT Gateways enable outbound internet access from private subnets, and the multi-AZ design ensures fault tolerance and horizontal scalability. This architecture demonstrates AWS best practices for production web applications requiring high availability, automatic scaling, and separation of concerns across presentation, application, and data tiers. Fork this diagram on Diagrams.so to customize VPC CIDR blocks, adjust instance types, add ElastiCache layers, or export as .drawio for team collaboration.

People also ask

How do I design a highly available three-tier web application on AWS with auto scaling and multi-AZ database?

Deploy across two AWS availability zones with Application Load Balancer distributing traffic to Auto Scaling EC2 instances in private subnets, RDS PostgreSQL primary in one AZ with read replica in another, CloudFront CDN for static assets, and WAF for security. This diagram shows the complete VPC design with public/private subnet separation and NAT Gateways.