Lab 04: 모듈 만들기

terraform {
  required_version = ">= 1.0.0"

  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = "~> 5.0"
    }
  }
}

provider "aws" {
  region = "ap-northeast-2"
}

variable "project" {
  description = "프로젝트 이름"
  type        = string
  default     = "lab04"
}

# dev 환경 네트워크 — 모듈 첫 번째 호출
module "dev_network" {
  source = "./modules/network"   # 로컬 모듈 경로

  name_prefix        = "${var.project}-dev"
  vpc_cidr           = "10.0.0.0/16"
  public_subnet_cidr = "10.0.1.0/24"
  availability_zone  = "ap-northeast-2a"

  tags = {
    Environment = "dev"
    ManagedBy   = "terraform"
  }
}

# prod 환경 네트워크 — 동일 모듈 두 번째 호출 (설정값만 다름)
module "prod_network" {
  source = "./modules/network"

  name_prefix        = "${var.project}-prod"
  vpc_cidr           = "10.1.0.0/16"
  public_subnet_cidr = "10.1.1.0/24"
  availability_zone  = "ap-northeast-2a"

  tags = {
    Environment = "prod"
    ManagedBy   = "terraform"
  }
}

# 모듈의 output을 루트에서 재노출
output "dev_vpc_id" {
  description = "dev VPC ID"
  value       = module.dev_network.vpc_id
}

output "dev_subnet_id" {
  description = "dev 퍼블릭 서브넷 ID"
  value       = module.dev_network.public_subnet_id
}

output "prod_vpc_id" {
  description = "prod VPC ID"
  value       = module.prod_network.vpc_id
}

output "prod_subnet_id" {
  description = "prod 퍼블릭 서브넷 ID"
  value       = module.prod_network.public_subnet_id
}

variable "name_prefix" {
  description = "리소스 이름 접두사"
  type        = string
}

variable "vpc_cidr" {
  description = "VPC CIDR 블록"
  type        = string
}

variable "public_subnet_cidr" {
  description = "퍼블릭 서브넷 CIDR 블록"
  type        = string
}

variable "availability_zone" {
  description = "가용 영역"
  type        = string
}

variable "tags" {
  description = "리소스에 적용할 태그"
  type        = map(string)
  default     = {}
}

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

  tags = merge(var.tags, {
    Name = "${var.name_prefix}-vpc"
  })
}

resource "aws_subnet" "public" {
  vpc_id                  = aws_vpc.this.id
  cidr_block              = var.public_subnet_cidr
  availability_zone       = var.availability_zone
  map_public_ip_on_launch = true

  tags = merge(var.tags, {
    Name = "${var.name_prefix}-public-subnet"
  })
}

resource "aws_internet_gateway" "this" {
  vpc_id = aws_vpc.this.id

  tags = merge(var.tags, {
    Name = "${var.name_prefix}-igw"
  })
}

resource "aws_route_table" "public" {
  vpc_id = aws_vpc.this.id

  route {
    cidr_block = "0.0.0.0/0"
    gateway_id = aws_internet_gateway.this.id
  }

  tags = merge(var.tags, {
    Name = "${var.name_prefix}-public-rt"
  })
}

resource "aws_route_table_association" "public" {
  subnet_id      = aws_subnet.public.id
  route_table_id = aws_route_table.public.id
}

output "vpc_id" {
  description = "생성된 VPC ID"
  value       = aws_vpc.this.id
}

output "vpc_cidr" {
  description = "VPC CIDR 블록"
  value       = aws_vpc.this.cidr_block
}

output "public_subnet_id" {
  description = "퍼블릭 서브넷 ID"
  value       = aws_subnet.public.id
}

output "internet_gateway_id" {
  description = "인터넷 게이트웨이 ID"
  value       = aws_internet_gateway.this.id
}