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CDK for Terraformでmoduleを利用する

みゃばお



事前準備

  • CDKTF のインストール（Mac）
    terraformが別途インストールしてあるとエラーになるのでbrewで実施する場合はterraformはアンインストール推奨
    brewでインストールするとterraformも合わせてインストールされる。

brew install cdktf


プロジェクト初期化

cdktf init --template="typescript" --providers="aws@~>4.0"

実行すると対話モードが開始されるのでそれぞれ入力

Newer version of Terraform CDK is available [0.19.0] - Upgrade recommended
Welcome to CDK for Terraform!

By default, cdktf allows you to manage the state of your stacks using Terraform Cloud for free.
cdktf will request an API token for app.terraform.io using your browser.

If login is successful, cdktf will store the token in plain text in
the following file for use by subsequent Terraform commands:
    /Users/goalsymabashi/.terraform.d/credentials.tfrc.json

Note: The local storage mode isn't recommended for storing the state of your stacks.

? Do you want to continue with Terraform Cloud remote state management? no
? Project Name samplemodule
? Project Description samplemodule
? Do you want to start from an existing Terraform project? no
? Do you want to send crash reports to the CDKTF team? Refer to
https://developer.hashicorp.com/terraform/cdktf/create-and-deploy/configuration-file#enable-crash-reporting-for-the-cli for more information no

added 2 packages, and audited 57 packages in 1s

7 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

added 314 packages, and audited 371 packages in 8s

38 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
========================================================================================================

  Your cdktf typescript project is ready!

  cat help                Print this message

  Compile:
    npm run get           Import/update Terraform providers and modules (you should check-in this directory)
    npm run compile       Compile typescript code to javascript (or "npm run watch")
    npm run watch         Watch for changes and compile typescript in the background
    npm run build         Compile typescript

  Synthesize:
    cdktf synth [stack]   Synthesize Terraform resources from stacks to cdktf.out/ (ready for 'terraform apply')

  Diff:
    cdktf diff [stack]    Perform a diff (terraform plan) for the given stack

  Deploy:
    cdktf deploy [stack]  Deploy the given stack

  Destroy:
    cdktf destroy [stack] Destroy the stack

  Test:
    npm run test        Runs unit tests (edit __tests__/main-test.ts to add your own tests)
    npm run test:watch  Watches the tests and reruns them on change

  Upgrades:
    npm run upgrade        Upgrade cdktf modules to latest version
    npm run upgrade:next   Upgrade cdktf modules to latest "@next" version (last commit)

 Use Providers:

  You can add prebuilt providers (if available) or locally generated ones using the add command:

  cdktf provider add "aws@~>3.0" null kreuzwerker/docker

  You can find all prebuilt providers on npm: https://www.npmjs.com/search?q=keywords:cdktf
  You can also install these providers directly through npm:

  npm install @cdktf/provider-aws
  npm install @cdktf/provider-google
  npm install @cdktf/provider-azurerm
  npm install @cdktf/provider-docker
  npm install @cdktf/provider-github
  npm install @cdktf/provider-null

  You can also build any module or provider locally. Learn more https://cdk.tf/modules-and-providers

========================================================================================================

[2023-10-30T14:40:01.148] [INFO] default - Checking whether pre-built provider exists for the following constraints:
  provider: aws
  version : ~>4.0
  language: typescript
  cdktf   : 0.18.0

[2023-10-30T14:40:03.024] [INFO] default - Pre-built provider does not exist for the given constraints.
[2023-10-30T14:40:03.024] [INFO] default - Adding local provider registry.terraform.io/hashicorp/aws with version constraint ~>4.0 to cdktf.json
Local providers have been updated. Running cdktf get to update...
Generated typescript constructs in the output directory: .gen

以下のような感じで構成が作成される。

.
├── __tests__
├── cdktf.json
├── help
├── jest.config.js
├── main.ts
├── node_modules
├── package-lock.json
├── package.json
├── setup.js
└── tsconfig.json


providerインストール

npm install @cdktf/provider-aws

エラーになる場合

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: ModuleSample@1.0.0
npm ERR! Found: cdktf@0.18.2
npm ERR! node_modules/cdktf
npm ERR!   cdktf@"^0.18.2" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer cdktf@"^0.19.0" from @cdktf/provider-aws@18.0.3
npm ERR! node_modules/@cdktf/provider-aws
npm ERR!   @cdktf/provider-aws@"*" from the root project
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR!
npm ERR! For a full report see:

  • Version指定でインストールする

npm install @cdktf/provider-aws@17.0.11

added 1 package, and audited 372 packages in 4s

38 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

cdktf.jsonの変更

利用するモジュールを定義する。

   "terraformModules": [
    {
      "name": "sqs",
      "source": "terraform-aws-modules/sqs/aws",
      "version": "4.1.0"
    }


main.ts修正

import { Construct } from "constructs";
import { App, TerraformStack } from "cdktf";

import { AwsProvider } from "@cdktf/provider-aws/lib/provider";

import { sqsQueue } from '@cdktf/provider-aws';

class MyStack extends TerraformStack {
  constructor(scope: Construct, id: string) {
    super(scope, id);

    new AwsProvider(this, 'aws', {
      region: 'ap-northeast-1', // Example: 'us-west-2'
      defaultTags: [{
        tags: {
          environment: process.env.ENV_ID || `${id}`,

        }
      }]
    });

    // define resources here

    new sqsQueue.SqsQueue(this, 'queue', {
      name: `${id}-queue`,
    });


  }
}

const app = new App();
new MyStack(app, "samplemodule");
app.synth();

Getする


moduleがダウンロードされる。

cdktf get

CDKTFでのプロビジョニング

DryRun

cdktf diff


Apply

cdktf deploy

確認

cdktf list

Stack name                                                Path
samplemodule                                              cdktf.out/stacks/samplemodule


Terraformでの実行


chdir指定でterraformのコマンドも実行できる。
作成したリソースの詳細を確認するためのshowはCDKTFでは未実装なので、確認したい場合はterraformで実行することもできる。
CDKTFではterraformで実装されているtargetオプションも存在しないため、特定のリソースのみに更新かけたい場合はterraformで実行する必要がある。※2023/10/30時点

terraform -chdir="cdktf.out/stacks/samplemodule" state list
aws_sqs_queue.queue
terraform -chdir="cdktf.out/stacks/samplemodule" show
# aws_sqs_queue.queue:
resource "aws_sqs_queue" "queue" {
    arn                               = "arn:aws:sqs:ap-northeast-1:0123456789:samplemodule-queue"
    content_based_deduplication       = false
    delay_seconds                     = 0
    fifo_queue                        = false
    id                                = "https://sqs.ap-northeast-1.amazonaws.com/0123456789/samplemodule-queue"
    kms_data_key_reuse_period_seconds = 300
    max_message_size                  = 262144
    message_retention_seconds         = 345600
    name                              = "samplemodule-queue"
    receive_wait_time_seconds         = 0
    sqs_managed_sse_enabled           = true
    tags_all                          = {
        "environment" = "samplemodule"
    }
    url                               = "https://sqs.ap-northeast-1.amazonaws.com/0123456789/samplemodule-queue"
    visibility_timeout_seconds        = 30
}

リソース削除

cdktf destroy


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