About This Architecture

Multi-AZ three-tier web app on AWS with Route 53 DNS, CloudFront CDN, WAF, and Shield protecting static assets in S3 and dynamic traffic through an ALB. Application tier spans two AZs with Auto Scaling Groups of EC2 t3.medium instances in private subnets, backed by RDS PostgreSQL primary-replica across AZs and ElastiCache clusters for session caching. CloudWatch monitors EC2 and RDS performance, Secrets Manager secures database credentials, and automated backups protect the primary database. This architecture demonstrates AWS best practices for fault tolerance, auto-scaling, and defense-in-depth security. Fork and customize this diagram on Diagrams.so to match your VPC CIDR blocks, instance types, or add additional services like SQS or SNS. Consider adding VPC Flow Logs and GuardDuty for enhanced security visibility in production deployments.

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

This diagram shows a production-grade AWS architecture using Route 53 for DNS, CloudFront and WAF for edge protection, an ALB distributing traffic to Auto Scaling EC2 instances across two AZs, and RDS PostgreSQL with read replicas for database resilience. ElastiCache clusters, Secrets Manager, CloudWatch, and automated backups complete the defense-in-depth approach.