aws_subnetをlistで作る

なぜ作った

呼び出し元のmain.tfの可読性を保ちつつ、モジュール側でよしなにサブネット作って欲しかった。

コード

main.tf

module mo_subnet {
  source = "./modules/subnet"

  vpc_id = module.mo_vpc.id

  subnets = [
    {
      name              = "3net"
      cidr_block        = cidrsubnet(var.cidr, 8, 0)
      availability_zone = "ap-northeast-1a"
    },
    {
      name              = "5net"
      cidr_block        = "10.0.5.0/24"
      availability_zone = "ap-northeast-1c"
    }
  ]
}a

./modules/subnet/main.tf

variable "vpc_id" {
  type = string
}

variable "subnets" {
  type = list
}

resource aws_subnet this {

  count = length(var.subnets)
      vpc_id            = var.vpc_id
      # インスタンスにパブリックIPアドレスを自動的に割り当てるのを防止
      map_public_ip_on_launch = false

      cidr_block        = var.subnets[count.index].cidr_block
      availability_zone = var.subnets[count.index].availability_zone

      tags = {
        Name = var.subnets[count.index].name
      }

}

参考

-https://www.hashicorp.com/blog/hashicorp-terraform-0-12-preview-for-and-for-each

• https://github.com/terraform-aws-modules/terraform-aws-vpc/blob/v1.0.0/main.tf