nanochat/terraform/modules/vpc/main.tf

terraform {
  required_version = ">= 1.5.0"
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 5.0"
    }
  }
}

locals {
  cluster_tag_key = "kubernetes.io/cluster/${var.cluster_name}"
}

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "~> 5.0"

  name = "${var.name}-vpc"
  cidr = var.cidr

  azs             = var.azs
  private_subnets = var.private_subnets
  public_subnets  = var.public_subnets

  enable_nat_gateway     = true
  single_nat_gateway     = var.single_nat_gateway
  one_nat_gateway_per_az = !var.single_nat_gateway

  enable_dns_hostnames = true
  enable_dns_support   = true

  public_subnet_tags = {
    "kubernetes.io/role/elb" = "1"
    (local.cluster_tag_key)  = "shared"
  }

  private_subnet_tags = {
    "kubernetes.io/role/internal-elb" = "1"
    (local.cluster_tag_key)           = "shared"
  }

  tags = var.tags
}