AWS Three-Tier Web App with Multi-AZ RDS

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About This Architecture

Multi-AZ three-tier web app leveraging Route 53, CloudFront CDN, WAF, and ALB to distribute traffic across EC2 Auto Scaling Groups in separate availability zones. Application servers in private subnets connect to RDS PostgreSQL with primary-replica replication across AZ-1 and AZ-2, ensuring database failover and read scaling. CloudWatch monitors EC2 and RDS metrics, while Secrets Manager and KMS secure credentials and encryption keys throughout the VPC. Fork this diagram to customize instance types, subnet ranges, or add additional services like ElastiCache or SQS for your production workload.

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How do I design a highly available AWS web application with multi-AZ database failover and auto-scaling?

This diagram shows a production-ready three-tier AWS architecture spanning two availability zones with Route 53 DNS, CloudFront CDN, WAF protection, and ALB distributing traffic to Auto Scaling EC2 instances. RDS PostgreSQL primary-replica replication across AZ-1 and AZ-2 enables automatic failover and read scaling, while CloudWatch, Secrets Manager, and KMS provide monitoring and security.

AWS Three-Tier Web App with Multi-AZ RDS

AWSintermediatethree-tier architecturemulti-AZRDSAuto Scalinghigh availability
Domain: Cloud AwsAudience: AWS solutions architects designing highly available web applications
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Created by

March 2, 2026

Updated

March 2, 2026 at 5:29 PM

Type

architecture

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