In this tutorial, we'll use Terraform to provision an EC2 instance in the eu-west-2 region with specific configurations, including attaching an Elastic IP, creating a key pair, and installing Nginx on the instance.

Prerequisites:

• Terraform installed on your machine.

• Access to /root/terraform-challenges/project-citadel directory for storing Terraform configuration files.

Terraform Configuration:

Step 1: Create variables.tf File:

Create a file named variables.tf and define the variables:

variable "region" {
  type    = string
  default = "eu-west-2"
}

Step 2: Create main.tf File:

Create a file named main.tf and define the Terraform resources:

resource "aws_key_pair" "citadel-key" {
  key_name   = "citadel"
  public_key = file("/root/terraform-challenges/project-citadel/.ssh/ec2-connect-key.pub")
}

resource "aws_instance" "web" {
  ami             = "ami-06178cf087598769c"
  instance_type   = "m5.large"
  key_name        = aws_key_pair.citadel-key.key_name
  user_data       = file("/root/terraform-challenges/project-citadel/install-nginx.sh")
}

resource "aws_eip" "eip" {
  instance = aws_instance.web.id
  vpc      = true

  provisioner "local-exec" {
    command = "echo ${self.public_dns} >> /root/citadel_public_dns.txt"
  }
}

Step 3: Create install-nginx.sh File:

Create a file named install-nginx.sh and add the following script:

#!/bin/bash

apt-get update -y
apt-get install nginx -y

Step 4: Initialize and Apply Terraform Configuration:

Initialize Terraform and apply the configuration:

terraform init
terraform apply

Conclusion:

In this tutorial, we used Terraform to provision an EC2 instance with specific configurations, including attaching an Elastic IP, creating a key pair, and installing Nginx on the instance. By following the provided steps, you can efficiently manage AWS infrastructure using Terraform, ensuring consistency and reproducibility in your environment.