Terraform: module化する話

モノはこんな

$ cd terra-modulized-es
$ tree .
.
├── modules
│   └── elasticsearch
│       └── aws_es_node.tf
└── services
    └── elasticsearch
        ├── production
        │   ├── main.tf
        └── staging
            └── main.tf

6 directories, 4 files

ここに変数の中身を書く

$cat terra-modulized-es/services/elasticsearch/production/main.tf
module "production-es-cluster" {
  region          = "ap-northeast-1"
  source          = "../../../modules/elasticsearch"
  lb_name         = "production-es-alb"
  internal_option = "false"
  lb_type         = "application"
  es_alb_sg       = "sg-xxxxxxxxxxxxxxxxx"
  es_alb_subnet   = ["subnet-xxxxxxxx", "subnet-xxxxxxxx"]
  env             = "production"
}

こっちは変数の定義とリソースのオプションを書くだけ

$cat terra-modulized-es/modules/elasticsearch/aws_es_node.tf
provider "aws" {
  region = "${var.region}"
}

variable "region" {}
variable "lb_name" {}
variable "internal_option" {}
variable "lb_type" {}
variable "es_alb_sg" {}

variable "es_alb_subnet" {
  type = "list"
}

variable "env" {}

resource "aws_lb" "es-alb" {
  name                       = "${var.lb_name}"
  internal                   = "${var.internal_option}"
  load_balancer_type         = "${var.lb_type}"
  security_groups            = ["${var.es_alb_sg}"]
  subnets                    = ["${var.es_alb_subnet}"]
  enable_deletion_protection = false

  tags = {
    Environment = "${var.env}"
  }
}

できた。

$ cd terra-modulized-es/services/elasticsearch/production
$ terraform apply

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  + create

Terraform will perform the following actions:

  + module.production-es-cluster.aws_lb.es-alb
〜略〜
module.production-es-cluster.aws_lb.es-alb: Still creating... (2m10s elapsed)
module.production-es-cluster.aws_lb.es-alb: Creation complete after 2m13s (ID: arn:aws:elasticloadbalancing:ap-northea...app/production-es-alb/xxxxxxxx)

Apply complete! Resources: 1 added, 0 changed, 0 destroyed.

variableも外だしした方がいいな。