Ticket Type: Task
Title: Terraform Locals with AWS
Project: Cloud Infrastructure Deployment
Assignee: You
Reporter: Derek Morgan
Priority: High
Labels: Terraform, AWS, VPC, Subnet, Locals
Epic Link: AWS Infrastructure Expansion
Sprint: Sprint 01/Locals

Lab Setup This lab uses Localstack to simulate an AWS environment. Localstack is already preinstalled in your environment. You don't need keys or to configure the provider. If you'd like to use your own account, feel free to specify your provider configuration and run unset aws and unset terraform to decouple them from Localstack.

Description:

A VPC and an associated subnet are needed for your cloud infrastructure. The team wants to be able to create and modify these resources by editing only one file. Below is an example of the resources we need.

resource "aws_vpc" "this" {
  cidr_block           = "10.0.0.0/16"
  enable_dns_support   = true
  enable_dns_hostnames = true
  
  tags = {
    Name = "infrastructure-dev"
  }
}

resource "aws_subnet" "this" {
  vpc_id     = aws_vpc.this.id
  cidr_block = "10.0.1.0/24"
  
  tags = {
    Name = "infrastructure-dev-subnet"
  }
}

Acceptance Criteria:

Note: If the terraform validate command fails, all tasks in the lab will fail!

1. Create a locals.tf file with the necessary locals data structure to store the needed information. The items that need to be in the locals.tf file are:

name                = "${var.project}-${var.env}"  
description         = "${var.project} ${var.env} VPC"  
cidr_block          = "10.0.0.0/16"  
enable_dns          = var.env == "dev" ? false : true  
subnet_cidr_block   = "10.0.1.0/24"  
subnet_name         = "${var.project}-${var.env}-subnet"

2. Create the AWS VPC resource and reference the items in the data structure as needed.
3. Create the AWS subnet resource and reference the items in the data structure as needed.
4. If you already have variables or conditionals created for the attributes, feel free to use those. Otherwise, the attributes can be hardcoded in the locals block.

Implementation Notes:

Feel free to use code from previous labs. The values aren't as important as the concepts.

• AWS VPC Resource Documentation
• AWS Subnet Resource Documentation
• Terraform Locals Documentation