AWS Terraform Ansible Project

This project provisions an AWS infrastructure using Terraform and configures it with Ansible. The architecture includes a Virtual Private Cloud (VPC) with multiple subnets spread across different availability zones. Each subnet hosts a Linux EC2 instance, with specific configurations detailed below. Ansible is employed to manage the installation of webservers and testing connectivity, utilizing dynamic inventory for automation.

AWS Architecture Overview

• VPC: A Virtual Private Cloud is created with subnets distributed across four availability zones.
• Public Subnets: Four public subnets exist, each hosting a Linux EC2 instance with a webserver installed. These instances have SSH and HTTP access.
• Private Subnets: Two private subnets are established. EC2 instances reside in these subnets, inaccessible directly from the internet. A bastion host is deployed in the second public subnet to provide access to the private instances.
• NAT Gateway: A NAT Gateway is placed in the first public subnet, enabling internet access for the instances in the private subnets.

Ansible Configuration

• Webservers: Ansible is utilized to install webservers on instances in Public Subnets 3 and 4.
• Dynamic Inventory: Ansible dynamically pulls inventory information for configuration management.
• Connectivity Testing: Ansible is employed to test connectivity between instances.

Version Control and Environments

• Git and GitHub: Version control is managed using Git and hosted on GitHub.
• Branches: Separate branches are utilized for different environments, including production, staging, and development.

Instructions to Run Terraform Code

Note: Destroy 1 environment first before creating another environent because the learner lab not support so many vm at the same time

1. Update AWS Credentials:

• Set AWS credentials as environment variables.

2. Create S3 Bucket for Backend:

• Create an S3 bucket named "dev-group5-s3" based on the environment to serve as the backend for Terraform.

3. Navigate to Network Directory (change the path for different environemnt):

   cd Terraform/Dev/Network
   

4. Provision using Terraform:

   terraform init
   
   terraform plan
   
   terraform apply
   

5. Navigate to Webserver Directory:

   cd ../Webserver
   

6. Generate SSH Key:

   ssh-keygen -t rsa -f projectkey
   

7. Provision using Terraform:

   terraform init
   
   terraform plan
   
   terraform apply
   

Instructions to Run Ansible for webserver 3 & 4

1. Update SSH key:

• Modify main-playbook.yaml, change value of ansible_ssh_private_key_file to the path of the key created in previous Terraform step. e.g ../Terraform/Dev/Webserver/projectkey

2. Run playbook:

• Go to Ansible folder: cd Ansible
• Run ansible command: ansible-playbook main-playbook.yaml

Follow these steps to provision the AWS infrastructure and configure it using Terraform and Ansible.