Creating multiple EC2 instances using Terraform

.Multiple EC2 Instances using Terraform

## Step 1 ##
In your current user directory, create a folder named ".aws". 
Also create a file named "credentials" with your AWS credentials.

## Step 2 ##
Download Terraform (https://releases.hashicorp.com/terraform/0.14.7/terraform_0.14.7_windows_amd64.zip)
Create a folder with a name of your taste and place the "terraform.exe" file.

## Step 3 ##
In that same folder you just created, create the files: "provider.tf", "variables.tf", "main.tf" and "config.sh". 
These files are available on this gist.

## Step 4 ##
At this point you should be able to start using terraform.
To do that, open your command line and make sure you're placed in the directory you created in the step 2.
After that, insert the following commands, one by one:

terraform init

terraform plan

terraform apply

config.sh

#!/bin/bash -x

mkdir /ansible
touch /ansible/welcome-file
echo "Hello" > /ansible/welcome-file

main.tf

resource "aws_instance" "instance1" {
  count = var.instance_count
  ami = "ami-0885b1f6bd170450c"
  instance_type = "t2.micro"
  key_name = var.key_name
  security_groups = [
    var.sec_group_name,
  ]
  vpc_security_group_ids = [
    aws_security_group.instance.id,
  ]
  root_block_device {
    volume_size = var.volume_size
  }
  user_data = filebase64(var.user_data)
}


resource "aws_security_group" "instance" {
  description = var.sec_group_description
  egress = [
    {
      cidr_blocks = [
        "0.0.0.0/0",
      ]
      description = ""
      from_port = 0
      ipv6_cidr_blocks = []
      prefix_list_ids = []
      protocol = "-1"
      security_groups = []
      self = false
      to_port = 0
    },
  ]
  ingress = [
    for _port in var.port_list:
    {
      cidr_blocks = [
      for _ip in var.ip_list:
      _ip
      ]
      description = ""
      from_port = _port
      ipv6_cidr_blocks = []
      prefix_list_ids = []
      protocol = "tcp"
      security_groups = []
      self = false
      to_port = _port
    }
  ]
  name = var.sec_group_name
} 

provider.tf

terraform {
  required_version = ">= 0.13"
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "3.22.0"
    }
  }
}

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

variables.tf

variable "key_name" {
  default = "Ansible"
}

variable "sec_group_name" {
  default = "Ansible Security Group"
}

variable "sec_group_description" {
  default = "Ansible Security Group - allow All Trafic to My IP"
}
variable "user_data" {
  default = "./config.sh"
}

variable "volume_size" {
  default = 8
}

variable "ip_list" {
  description = "Allowed IPs"
  type = list(string)
  default = [
    "0.0.0.0/0",
  ]
}

variable "instance_count" {
  default = "2"
}

variable "port_list" {
  description = "Allowed ports"
  type = list(number)
  default = [
    22,
    80,
    8080,
  ]
}