Terraform で AWS VPC の環境づくり[入門]

やりたいこと

terraform の大まかな流れが知りたい。
とりあえず AWS VPC の環境を作成して、確認後廃棄。

各種ファイルの用意

VPC 本体

vpc.tf

variable "aws_region" {}

provider "aws" {
  version = "~> 3.1"
  region  = var.aws_region
}

variable "project_prefix" {}
variable "vpc_cidr" {}

resource "aws_vpc" "vpc" {
  cidr_block       = var.vpc_cidr
  instance_tenancy = "default"

  enable_dns_support   = true
  enable_dns_hostnames = true

  tags = {
    Name = "${var.project_prefix}-vpc"
  }
}

変数の設定

test.tfvars

project_prefix = "tftest"
vpc_cidr       = "10.0.0.0/16"
aws_region     = "ap-northeast-1"

Git ignore

ref: https://github.com/github/gitignore/blob/master/Terraform.gitignore

.gitignore

# Local .terraform directories
**/.terraform/*

# .tfstate files
*.tfstate
*.tfstate.*

# Crash log files
crash.log

# Exclude all .tfvars files, which are likely to contain sentitive data, such as
# password, private keys, and other secrets. These should not be part of version
# control as they are data points which are potentially sensitive and subject
# to change depending on the environment.
#
*.tfvars

# Ignore override files as they are usually used to override resources locally and so
# are not checked in
override.tf
override.tf.json
*_override.tf
*_override.tf.json

# Include override files you do wish to add to version control using negated pattern
#
# !example_override.tf

# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
# example: *tfplan*

# Ignore CLI configuration files
.terraformrc
terraform.rc

実行

init

$ terraform init

差分の確認

$ terraform plan -var-file=test.tfvars

適用

$ terraform apply -var-file=test.tfvars

AWS Console 上からでもリソースが確認できる。

実行結果の表示

$ terraform show

破棄

$ terraform destroy -var-file=test.tfvars

おまけ

Makefile

今回は env という変数で呼び出すファイルを制御したが、workspace を使った方が良さそう(?)

env=test

clean:
	rm -rf ./.terraform

init:
	terraform init

plan:
	terraform plan -var-file=$(env).tfvars

apply:
	terraform apply -var-file=$(env).tfvars

show:
	terraform show

deploy: init plan apply show

destroy:
	terraform destroy -var-file=$(env).tfvars

次やりたいこと

• Docker 化
• リソース間連携
  • VPC に IGW 生やして Attach みたいな
• module 分割
• workspace の活用