Prerequisites

Installation on Linux

https://developer.hashicorp.com/terraform/tutorials/aws-get-started/install-cli

link for installation

Install VS Code also the extensions for Terraform.

Make a new folder.

Check if Terraform is installed.

How to write with HCL - Language for writing terraform

Syntax

#blocks and arguments
<block> <arguments> {
key1 = value1

}

Example:

resource "local_file" "batch3" {
    filename = "ash_new.txt"
    content = "this is my first script of terraform"
}

resource "random_string" "batch3_string" {
    length = 15
}

output "batch_string" {
    value = random_string.batch3_string[*].result
}

terraform init # Intializing terraform in the folder

terraform apply #A new file ash.txt is created with specific  content

For changing the file as the name is already batch 3 it is defined in the state page, hence only the file name will be changed by re-entering the init command. init command has to be initialized every time we add something new

How to create a Docker Container using HCL

terraform {
  required_providers {
    docker = {
      source = "kreuzwerker/docker"
      version = "~> 3.0.1"
    }
  }
}
provider "docker" {}

resource "docker_image" "nginx" {
  name         = "nginx:latest"
  keep_locally = false
}
resource "docker_container" "nginx" {
  image = docker_image.nginx.image_id
  name  = "tutorial"
  ports {
    internal = 80
    external = 80
  }
}

Inspect the current state using terraform show. Terraform has a built-in command called terraform state for advanced state management. Use the list subcommand to list the resources in your project's state. After applying check in local host with port 8000.

How to create Instances in AWS

Prerequisites:-

Create a Terraform admin user and configure it in the terminal:

aws configure

terraform {
  required_providers {
    docker = {
      source = "kreuzwerker/docker"
      version = "~> 3.0.1"
    }
  }
}

provider "docker" {}

resource "docker_image" "nginx" {
  name         = "nginx:latest"
  keep_locally = false
}

resource "docker_container" "nginx" {
  image = docker_image.nginx.image_id
  name  = "tutorial"
  ports {
    internal = 80
    external = 8000
  }
}
provider "aws" {
  region = "us-east-1"

}

resource "aws_s3_bucket" "batch9_bucket"{
  bucket = "batch-9-test-bucket"
  tags = {
    Name = "batch-9-test-bucket"
  }
}

resource "aws_instance" "batch3_instance" {
  count = 5
  ami = "ami-053b0d53c279acc90"
  instance_type = "t2.micro"
  tags = {
    Name = "btach-3-test-instance"
  }

}

terraform apply # for creating the instances

terraform destroy # for terminating the instances