Tutorial - build a VPC with CDK for Terraform

I tried the CDK for Terraform tutorial using TypeScript.
CDK for Terraform: Enabling Python & TypeScript Support

Install Terraform

Install Terraform | Terraform - HashiCorp Learn

$ brew install terraform

Install CDK for Terraform

$ yarn global add cdktf-cli

Tutorial: build a VPC on AWS

Create the project

When asked if you want to use Terraform Cloud for remote state management, answer "no".

$ mkdir vpc-example
$ cd vpc-example
$ cdktf init --template=typescript
...
Do you want to continue with Terraform Cloud remote state management (yes/no)? no
Project Name: (default: 'vpc-example')
Project Description: (default: 'A simple getting started project for cdktf.')

Implementation

Compared to Terraform HCL, the TypeScript types help you catch missing required options in real time. This is very helpful.

import { Construct } from 'constructs';
import { App, TerraformStack, Token } from 'cdktf';
import { Vpc } from './.gen/providers/aws/vpc';
import { Subnet } from './.gen/providers/aws/subnet';
import { AwsProvider } from './.gen/providers/aws'

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

   new AwsProvider(this, 'aws', {
     region: 'ap-northeast-1'
   });

   const vpc = new Vpc(this, 'my-vpc', {
     cidrBlock: '10.0.0.0/16'
   });
    new Subnet(this, 'my-subnet', {
     vpcId: Token.asString(vpc.id),
     cidrBlock: '10.0.0.0/24'
   });
 }
}

const app = new App();
new MyStack(app, 'vpc-example');
app.synth();

Generate Terraform JSON files

This command generates Terraform JSON config files from the TypeScript code. The files are output to the cdk.tf directory.

$ cdktf synth
Generated Terraform code in the output directory: cdktf.out

$ tree cdktf.out
cdktf.out
└── cdk.tf.json

Run Terraform

Run terraform with the generated config file to build the VPC on AWS.
If you haven't configured AWS yet, run aws configure first.

You can check the AWS Console VPC page to confirm that the new resources were created.

$ cd cdktf.out
$ terraform init
$ terraform plan
...
# Information about the VPC to be added is shown

$ terraform apply
aws_vpc.vpcexample_myvpc_80A1790F: Creating...
aws_vpc.vpcexample_myvpc_80A1790F: Still creating... [10s elapsed]
aws_vpc.vpcexample_myvpc_80A1790F: Creation complete after 10s [id=vpc-09aeca6257ae5fe31]
aws_subnet.vpcexample_mysubnet_3769B309: Creating...
aws_subnet.vpcexample_mysubnet_3769B309: Creation complete after 3s [id=subnet-0264b990708ed4f69]

Apply complete! Resources: 2 added, 0 changed, 0 destroyed.

Delete resources

Finally, delete the VPC created in this tutorial.

$ terraform destroy