Three Tier IaC using AWS CloudFormation

These templates will create the following resources:

• 1 VPC
• 1 Internet Gateway (IGW)
• 2 public subnets
• 2 private subnets for web server application
• 2 private subnets for database
• 1 bastion host for access and manage instances in private subnets
• 1 Application Load Balancer (ALB)
• 1 Auto Scaling Group (ASG)
• 1 Target Group
• 2 web server instances in private subnets
• 1 Security Group (SG) for the Bastion Host
• 1 Security Group (SG) for the web servers

The architectural diagram is as follows:

If you are interested in follow along the creation of this architecture, please check my two-part blog post on Medium:

• Step by Step Three-tier application infrastructure using AWS CloudFormation - Part 1
• Step By Step Three Tier Application Using AWS CloudFormation — Part 2