The purpose of this project is to quickly deploy a simple, two-tier architecture in the AWS cloud for a single-page application using IaC. This architecture reflects best practices when deploying an Application Load Balancer that’s open to the internet as per AWS Prescriptive Guidance. The solution is written in HCL which is Terraform's domain-specific language.

The components involved are the following:

• VPC
• EC2
• Auto-scaling group (ASG)
• Application load balancer (ALB)
• Security groups

1) HTTP traffic is transmitted from the client to the ALB which is the first point of entry into the infrastructure.

2) The ALB forwards the traffic to the healthy, backend EC2 instances which host the web application.

3) Thanks to the NAT gateway, return traffic from the isolated, private subnets makes its way back to the ALB.

4) The web site is served to the client.

This code assumes that you have already Terraform installed locally. For instructions on how to install Terraform, please refer to Hashicorp's documentation here.

To deploy this solution, please follow the instructions below.

1) Clone the repository locally:

git clone https://github.com/nick22d/webapp.git

2) Navigate into the repository:

cd webapp/

3) Run the following commands in the order written:

terraform init

terraform apply --auto-approve

4) Verify functionality by browsing to the DNS name of the ALB returned in the output with the command below:

curl $(terraform output -raw alb_dns_name)