About This Architecture

Three-tier AWS architecture separates web, application, and data layers across public and private subnets within a VPC. Users connect via HTTPS through an ALB that distributes traffic to EC2 instances in an Auto Scaling Group. The app tier writes to RDS PostgreSQL Primary while reads hit the Read Replica, with static assets served from S3. This pattern delivers high availability, read scalability, and security isolation for production workloads. Fork this diagram on Diagrams.so to customize instance types, add caching layers, or export as .drawio for your documentation.

People also ask

How do I design a three-tier web application architecture on AWS?

Use a VPC with public subnets for ALB and private subnets for EC2 app servers in an Auto Scaling Group. Route writes to RDS PostgreSQL Primary and reads to a Read Replica. Store static assets in S3.