Terraform Notes – Day 2 – 19 Sept 2023

Assignment

Publish a code on www.Debug.School using CODE Block.

Write a terraform code would create following resources
- keypair  (Pub - ON AWS - PVT - Local)
- Display a pvt on Console
- Create a Security group must open 80 Port
- Create a Ec2 instance Ubuntu using the same Key & SG which you created above.
- You must install/Start apache2 in EC2 instance
	$ apt-get update
	$ apt-get install apache2 -y
	$ systemctl start apache2

• https://registry.terraform.io/browse/modules
• https://registry.terraform.io/modules/terraform-aws-modules/vpc/aws/latest

How to pass values from on terraform module to another

• https://www.devopsschool.com/blog/how-to-use-one-modules-variable-in-another-module-in-terraform/

What is Module?
--------------------------
Is a dir structure
	contains
		- .tf
		- .tfvars
-===========================
YES - root module
	- Also would call child modules

child module
Is a dir structure
	contains
		- .tf
		- .tfvars
============================================
DevOpsX
	main.tf
		<module>webserver</module>
		<module>network</module>
		<module>dbserver</module>
	.tfvars
	webserver
		- .tf
		- .tfvars
	network
		- .tf
		- .tfvars
	dbserver
		- .tf
		- .tfvars
	appserver
		- .tf
		- .tfvars

Root Module Code

module "webserver" {
  source      = "./webserver"
}

module "dbserver" {
  source      = "./dbserver"
}

module "vpc" {
  source = "terraform-aws-modules/vpc/aws"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["us-east-1a", "us-east-1b", "us-east-1c"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
  public_subnets  = ["10.0.101.0/24", "10.0.102.0/24", "10.0.103.0/24"]

  enable_nat_gateway = false
  enable_vpn_gateway = false

  tags = {
    Terraform = "true"
    Environment = "dev"
  }
}