terraform/terraform-module at master · networknuts/terraform · GitHub

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#Create a directory "nn-app"
#mkdir nn-app
#Create another directory "modules" inside "nn-app"
#mkdir -p nn-app/modules
#mkdir -p nn-app/modules/ec2
#mkdir -p nn-app/modules/vpc
#Create one directory each for every environment, say "dev" and "prod"
#mkdir -p nn-app/prod
#mkdir -p nn-app/dev
#
# You should have this directory structure
nn-app/
  |__ modules
  |      |_ ec2
  |      |_ vpc
  |__ dev
  |__ prod

########

Create a file vim nn-app/modules/ec2/instance.tf

resource "aws_instance" "web" {
  count         = "${var.ec2_count}"
  ami           = "${var.ami_id}"
  instance_type = "${var.instance_type}"
  subnet_id     = "${var.subnet_id}"

  tags = {
    Name = "networknuts"
  }
}

## file instance.tf end here

Create a file vim nn-app/modules/ec2/vars.tf

variable "ec2_count" {
  default = "1"
}

variable "ami_id" {}

variable "instance_type" {
  default = "t2.micro"
}

variable "subnet_id" {}

## file vars.tf end here

#Create a file vim nn-app/modules/vpc/networking.tf

resource "aws_vpc" "main" {
  cidr_block       = "${var.vpc_cidr}"
  instance_tenancy = "${var.tenancy}"

  tags = {
    Name = "main"
  }
}

resource "aws_subnet" "main" {
  vpc_id     = "${var.vpc_id}"
  cidr_block = "${var.subnet_cidr}"

  tags = {
    Name = "Main"
  }
}

output "vpc_id" {
  value = "${aws_vpc.main.id}"
}

output "subnet_id" {
  value = "${aws_subnet.main.id}"
}

#file networking.tf end here

## Create a file vim nn-app/modules/vpc/vars.tf

variable "vpc_cidr" {
  default = "10.0.0.0/16"
}

variable "tenancy" {
  default = "dedicated"
}

variable "vpc_id" {}

variable "subnet_cidr" {
  default = "10.0.1.0/24"
}

# file vars.tf end here

# Create a file vim nn-app/dev/main.tf

provider "aws" {
  region = "ap-south-1"
}

module "my_vpc" {
  source      = "../modules/vpc"
  vpc_cidr    = "192.168.0.0/16"
  tenancy     = "default"
  vpc_id      = "${module.my_vpc.vpc_id}"
  subnet_cidr = "192.168.1.0/24"
}

module "my_ec2" {
  source        = "../modules/ec2"
  ec2_count     = 1
  ami_id        = "ami-5a8da735"
  instance_type = "t2.micro"
  subnet_id     = "${module.my_vpc.subnet_id}"
}

# file main.tf end here

# Create a file vim nn-app/prod/main.tf

provider "aws" {
  region = "ap-south-1"
}

module "my_vpc" {
  source      = "../modules/vpc"
  vpc_cidr    = "192.168.0.0/16"
  tenancy     = "default"
  vpc_id      = "${module.my_vpc.vpc_id}"
  subnet_cidr = "192.168.1.0/24"
}

module "my_ec2" {
  source        = "../modules/ec2"
  ec2_count     = 1
  ami_id        = "ami-5a8da735"
  instance_type = "t2.micro"
  subnet_id     = "${module.my_vpc.subnet_id}"
}

# file main.tf end here