A simple overview of Terraform

Comparison between Ansible, Docker and Terraform

Ansible	Docker	Terraform
Ansible is a configuration management tool	Docker is a container tool	Terraform is an Orchestration tool
It provides support for mutable infrastructure	It provides support for immutable infrastructure	It provides support for immutable infrastructure
It follows a procedural language	It follows a declarative language	It follows a declarative language
It provides complete support for packaging and templating	It provides support for packaging and templating	It provides partial support for packaging and templating
It does not have lifecycle management	It follows lifecycle	It depends on lifecycle and state management

Write a terraform script where you create a linux EC2 instance with Security group and key defined so you should be able to use key to login to EC2 instance

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 3.0"
    }
  }
}

# Configure the AWS Provider
provider "aws"  {
  region     = "us-west-2"
  access_key = "()"
  secret_key = "()"
}
resource "aws_key_pair" "deployer" {
  key_name   = "deployer-key"
  public_key = "ssh-rsa 
}
resource "aws_security_group" "instance" {
  name = "terraform-example-instance"
  ingress {
    from_port   = 8080
    to_port     = 8080
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}
variable "security_group_id" {}

data "aws_security_group" "selected" {
  id = var.security_group_id
}