AWS Three-Tier Web Application Architecture

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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.

AWS Three-Tier Web Application Architecture

AWSintermediateThree-Tier ArchitectureVPCAuto ScalingRDS PostgreSQLALB
Domain: Cloud AwsAudience: AWS solutions architects designing scalable web applications
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Created by

February 10, 2026

Updated

April 1, 2026 at 11:00 AM

Type

architecture

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