About This Architecture

Classic three-tier AWS architecture featuring an Application Load Balancer distributing traffic across EC2 instances in an Auto Scaling Group. The ALB in Public Subnet 1 routes requests to four EC2 instances spread across Private Subnets 1 and 2, which connect to RDS PostgreSQL in Private Subnets 3 and 4. Read replicas offload database queries while S3 serves static assets, ensuring high availability and horizontal scalability within a single VPC. Fork this diagram on Diagrams.so to customize subnet configurations, add CloudFront, or export as .drawio for your architecture documentation.

People also ask

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

Use an ALB in a public subnet to distribute traffic to EC2 instances in an Auto Scaling Group across private subnets. Connect to RDS PostgreSQL with a read replica for database resilience, and serve static assets from S3.