How to Build a Highly Available AWS Architecture Using Terraform

Building highly available AWS infrastructure requires distributing workloads across multiple Availability Zones using VPCs, ALBs, Auto Scaling Groups, and RDS Multi-AZ deployments. Terraform manages this through declarative HCL configs, remote S3 state, DynamoDB locking, and reusable modules. The guide walks through a 7-step build process and covers CI/CD integration, security best practices, and common mistakes to avoid.