About This Architecture

Three-tier AWS web architecture with ALB distributing HTTPS traffic across Auto Scaling EC2 instances in private subnets. Application tier connects to RDS PostgreSQL with read replica for database scaling and S3 for static asset delivery. This pattern demonstrates AWS best practices for high availability, security isolation, and horizontal scaling. Fork this diagram on Diagrams.so to customize subnet configurations, add CloudFront, or adapt for your workload. Read replicas offload read-heavy queries while the primary handles writes.

People also ask

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

Use an ALB in public subnets to distribute traffic to Auto Scaling EC2 instances in private app-tier subnets. Connect to RDS PostgreSQL with a read replica in the data tier and serve static assets from S3.