Terraform Series - Launching WebServer with UserData

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Today we are going to see:

1) Launching a EC2 Instance.

2) Configure HTTP server using a script which will be executed once the EC2 instance created.

3) Update the Security Group to allow incoming traffic on port "80".

4) Finally verify accessing the public IP/index.html

We are going to create a file which has the steps to configure HTTP server.

#! /bin/bash
sudo yum update -y
sudo yum install -y httpd
sudo systemctl enable httpd
sudo service httpd start  
sudo echo '<h1>Welcome to My App - APP-1</h1>' | sudo tee /var/www/html/index.html
sudo mkdir /var/www/html/app1
sudo echo '<!DOCTYPE html> <html> <body style="background-color:rgb(250, 210, 210);">
<h1>Welcome to APP-1 </body></html>' | sudo tee /var/www/html/app1/index.html
sudo curl http://169.254.169.254/latest/dynamic/instance-identity/document -o /var/www/html/app1/metadata.html

--------------------------------------------------------------------------------------
# Terraform Block
terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
    }
  }
}
# Provider Block
provider "aws" {
  profile = "default" # AWS Credentials configured via AWS CLI.
  region  = "us-east-1"
}

# Resource Block
resource "aws_instance" "ec2demo" {
  ami           = "ami-0b5eea76982371e91" # Amazon Linux in us-east-1
  instance_type = "t2.micro"
  user_data = file("${path.module}/appinstall.sh") -> Calling the USERDATA Script.
  tags = {
    "Name" = "webserver"
  }
}
resource "aws_security_group_rule" "ec2demoingress" {
  type              = "ingress"
  from_port         = 0
  to_port           = 80
  protocol          = "tcp"
  cidr_blocks       = ["0.0.0.0/0"]
  ipv6_cidr_blocks  = ["::/0"]
  security_group_id = "sg-0495b116a9de10f0c"
}


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