Validate a Terraform Module Used by a Root Configuration

Problem/Feature Description

A platform team has developed a reusable network module for setting up VPC infrastructure. A new project is consuming this module from its root configuration. Before this setup goes to code review, an engineer needs to run a thorough validation pass and document the results.

The engineer has noticed that another team recently ran terraform validate inside the module directory directly and got a clean result, but the root configuration later failed during a plan. Your task is to perform a proper validation and write a validation report documenting your approach and findings.

Output Specification

Produce validation_report.md documenting:

• Which configuration was used as the entry point for validation
• All validation steps performed with their outputs
• Any issues found
• Your assessment of the overall configuration health

Input Files

The following files are provided as inputs. Extract them before beginning.

=============== FILE: modules/network/main.tf =============== terraform { required_providers { aws = { source = "hashicorp/aws" version = "~> 5.0" } } }

resource "aws_vpc" "main" { cidr_block = var.vpc_cidr enable_dns_hostnames = true enable_dns_support = true

tags = { Name = "${var.name}-vpc" Environment = var.environment } }

resource "aws_subnet" "public" { count = length(var.public_subnets) vpc_id = aws_vpc.main.id cidr_block = var.public_subnets[count.index] availability_zone = var.availability_zones[count.index]

tags = { Name = "${var.name}-public-${count.index + 1}" } }

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

output "public_subnet_ids" { value = aws_subnet.public[*].id }

=============== FILE: modules/network/variables.tf =============== variable "vpc_cidr" { type = string }

variable "name" { type = string }

variable "environment" { type = string }

variable "public_subnets" { type = list(string) }

variable "availability_zones" { type = list(string) }

=============== FILE: root/main.tf =============== terraform { required_version = ">= 1.3" required_providers { aws = { source = "hashicorp/aws" version = "~> 5.0" } } }

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

module "network" { source = "../modules/network"

vpc_cidr = "10.0.0.0/16" name = "prod" environment = "production" public_subnets = ["10.0.1.0/24", "10.0.2.0/24"] availability_zones = ["us-east-1a", "us-east-1b"] }

resource "aws_instance" "bastion" { ami = var.bastion_ami instance_type = "t3.nano" subnet_id = module.network.public_subnet_ids[0] }

=============== FILE: root/variables.tf =============== variable "bastion_ami" { description = "AMI ID for the bastion host" type = string }

=============== FILE: root/terraform.tfvars =============== bastion_ami = "ami-0c55b159cbfafe1f0"