Terraform on AWS: From Zero to Production-Grade Infrastructure

Why Terraform on AWS?

Infrastructure as Code is no longer optional for production systems. Manual console clicks do not scale, cannot be reviewed, and cannot be rolled back. Terraform solves all three.

The Stack We Will Build

VPC with public and private subnets across 2 AZs
EC2 instances with launch templates
ECR for Docker image registry
IAM roles with least-privilege policies
GitHub Actions CI/CD pipeline with OIDC auth

Step 1: VPC Foundation

Every secure AWS setup starts with a properly segmented VPC. Use separate public subnets for load balancers and private subnets for application servers. Never put your application directly in a public subnet.

Step 2: IAM with Least Privilege

Never use AdministratorAccess in production. Create a role scoped to exactly what each service needs. For EC2 instances pulling from ECR, the role needs only ecr:GetDownloadUrlForLayer, ecr:BatchGetImage, and ecr:GetAuthorizationToken.

Step 3: GitHub Actions OIDC

No long-lived credentials. Configure OIDC so GitHub Actions gets temporary tokens scoped to your repo. This eliminates the risk of leaked AWS keys entirely.

Step 4: ECR + Docker

Push your Docker images to ECR as part of your CI pipeline. Tag images with the Git commit SHA so you always know exactly what is running in production.

Step 5: Zero Downtime Deployment

Use EC2 launch templates with Auto Scaling groups. Update the launch template, trigger an instance refresh, and new instances come up before old ones go down.

Want me to architect this for your project? Schedule a meeting.