About This Architecture

Multi-AZ high-availability web application spanning us-east-1a and us-east-1b with Application Load Balancer, Auto Scaling Group of Node.js EC2 instances, and RDS MySQL with read replica failover. Traffic flows from users through Internet Gateway to ALB nodes in public subnets, which route requests to EC2 t3.micro instances in private subnets across both availability zones. Application servers retrieve database credentials from Secrets Manager and connect to RDS MySQL Primary, backed by a standby replica in the alternate AZ for automatic failover. This architecture demonstrates AWS best practices for fault tolerance, auto-scaling, and secrets management in production workloads. Fork and customize this diagram on Diagrams.so to adapt security groups, instance types, or scaling policies for your specific requirements.

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How do I design a highly available AWS web application across multiple availability zones with automatic failover?

This diagram shows a production-ready multi-AZ architecture where an Application Load Balancer distributes traffic across EC2 Auto Scaling Groups in us-east-1a and us-east-1b, while RDS MySQL Primary replicates to a standby instance for automatic failover. EC2 instances securely retrieve database credentials from Secrets Manager and are protected by IAM roles and security groups enforcing least-pr