Day 65 Task: Working with Terraform Resources

🔶 Understanding Terraform Resources

A resource in Terraform represents a component of your infrastructure, such as a physical server, a virtual machine, a DNS record, or an S3 bucket. Resources have attributes that define their properties and behaviors, such as the size and location of a virtual machine or the domain name of a DNS record.

When you define a resource in Terraform, you specify the type of resource, a unique name for the resource, and the attributes that define the resource. Terraform uses the resource block to define resources in your Terraform configuration.

🔶 Task 1: Create a security group

To allow traffic to the EC2 instance, you need to create a security group. Follow these steps:

In your main.tf file, add the following code to create a security group:

terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "5.17.0"
    }
  }
}

provider "aws" {
  region = "eu-north-1"
}

resource "aws_security_group" "web_server" {
  name_prefix = "web-server-sg"

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

 egress {
        from_port  = 0
        to_port    = 0
        protocol    = "-1"
        cidr_blocks = ["0.0.0.0/0"]
        }
}

Run Terraform init to initialize the Terraform project.
Run Terraform apply to create the security group.

🔶 Task 2: Create an EC2 instance

Now you can create an EC2 instance with Terraform. Follow these steps:
In your main.tf file, add the following code to create an EC2 instance:

terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "5.17.0"
    }
  }
}

provider "aws" {
  region = "us-east-1"
}

resource "aws_security_group" "web_server" {
  name_prefix = "web-server-sg"

  ingress {
    from_port   = 80
    to_port     = 80
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }

 egress {
        from_port  = 0
        to_port    = 0
        protocol    = "-1"
        cidr_blocks = ["0.0.0.0/0"]
        }
}

resource "aws_instance" "web_server" {
  ami           = "ami-0fe8bec493a81c7da"
  instance_type = "t3.micro"
  key_name      = "terraform"

security_groups = [
    aws_security_group.web_server.name
  ]

tags = {
        Name= "InstanceByNilesh"
        }
  user_data = "${file("index.sh")}"
}

Now create an index.sh file in the same directory

#!/bin/bash
sudo apt update
sudo apt install nginx -y
sudo systemctl start nginx
echo "<html><body><h1>Welcome to my website, My name is Nilesh Sahare!</h1></body></html>" > /var/www/html/index.html

Note: Replace the ami and key_name values with your own. You can find a list of available AMIs in the AWS documentation.

Run terraform apply to create the EC2 instance.

🔶 Task 3: Access your website

Now that your EC2 instance is up and running, you can access the website you just hosted on it.

Now Open the web browser by using the new instance Public IP address.

Happy Learning :)

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