About This Architecture

Multi-AZ 3-tier architecture spanning two AWS availability zones with Route 53 DNS, Internet Gateway, and dual Application Load Balancers routing traffic to Auto Scaling EC2 fleets across public and private subnets. Application tier EC2 instances communicate with RDS MySQL Primary and Standby databases via security groups enforcing least-privilege access, while NAT Gateways enable outbound connectivity from private subnets. Bastion hosts in public subnets provide secure SSH access to application servers, and security groups restrict inbound traffic to specific ports and sources. This architecture demonstrates AWS best practices for fault tolerance, zero-trust networking, and operational visibility using CloudWatch, CloudTrail, WAF, and Secrets Manager. Fork and customize this diagram on Diagrams.so to match your VPC CIDR blocks, instance types, and compliance requirements.

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How do I design a highly available AWS 3-tier application with multi-AZ failover and security group controls?

This diagram shows a production-ready AWS architecture spanning two availability zones with Route 53 DNS, dual ALBs routing to Auto Scaling EC2 fleets, and RDS MySQL Primary-Standby replication for database failover. Security groups enforce least-privilege access between tiers, NAT Gateways enable private subnet outbound traffic, and bastion hosts provide secure administrative access while CloudWa