AWS Three-Tier Web Application with High Availability

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About This Architecture

Three-tier AWS web architecture combining Application Load Balancer, Auto Scaling EC2 instances, and RDS PostgreSQL with read replica for high availability. Users access dynamic content through ALB distributing traffic across t3.medium EC2 instances within an Auto Scaling Group, while CloudFront CDN serves static assets from S3. The data tier leverages RDS PostgreSQL primary with synchronous replication to a read replica, enabling read scaling and failover resilience. Ideal for production workloads requiring sub-second failover and horizontal scaling without re-architecting. Fork this diagram on Diagrams.so to customize instance types, add Multi-AZ configurations, or export as .drawio for your architecture reviews.

People also ask

How do I design a highly available three-tier web application on AWS with database read replicas?

This AWS diagram shows a three-tier architecture using Application Load Balancer to distribute traffic across Auto Scaling EC2 instances, RDS PostgreSQL with a read replica for database resilience, and CloudFront with S3 for static asset delivery.

AWS Three-Tier Web Application with High Availability

AWSintermediateThree-Tier ArchitectureHigh AvailabilityRDS PostgreSQLAuto ScalingCloudFront
Domain: Cloud AwsAudience: AWS solutions architects designing scalable web applications
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Created by

February 12, 2026

Updated

April 1, 2026 at 7:31 AM

Type

architecture

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