Building a Two-Tier AWS Infrastructure with Terraform, Flask & Ansible - Every File Explained

It looks like you're setting up a two-tier application architecture using Terraform, with Flask running on an EC2 instance and connecting to a MySQL database hosted in Amazon RDS. Let's break down the key components of your setup:

Infrastructure Components

1. VPC (Virtual Private Cloud)

   • You have defined three subnets:
     • One public subnet (public_subnet_cidr) for the EC2 instance.
     • Two private subnets (private_subnet_cidr and private_subnet_cidr_2) for RDS, ensuring high availability by placing them in different AZs (Availability Zones).

2. EC2 Instance

   • The EC2 instance is launched into the public subnet.
   • It has a security group that allows SSH access from anywhere (0.0.0.0/0), HTTP traffic on port 80, and all outbound traffic.

3. RDS (Relational Database Service)

   • RDS MySQL database instances are placed in private subnets for better security.
   • The RDS instance has a dedicated security group (db_sg) that only allows MySQL traffic from the EC2's security group, ensuring secure communication between your application and the

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