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Synthesizing Terraform Configuration using CDK for Terraform CLI

CDK for Terraform project allows you to synthesize Terraform JSON configuration using the cdktf synth command. This allows users to write a CDK for Terraform application in a language such as TypeScript or Python and generate JSON configuration that can be read by Terraform.

Let's take a simple TypeScript application.

import { Construct } from 'constructs';
import { App, TerraformStack } from 'cdktf';
import { AwsProvider, Instance } from './.gen/providers/aws';

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

    new AwsProvider(this, 'aws', {
      region: 'us-east-1'
    });

    new Instance(this, 'Hello', {
      ami: "ami-2757f631",
      instanceType: "t2.micro"
    });
  }
}

const app = new App();
new MyStack(app, 'hello-terraform');
app.synth();

To synthesize the application code into Terraform JSON configuration, run the cdktf synth.

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

This command will generate a directory called cdktf.out. This directory contains the Terraform JSON configuration for application.

Deploy Workflow Using Terraform CLI

Use the Terraform CLI commands to provision infrastructure resources.

cd cdktf.out

Terraform plan

terraform plan

Terraform apply

terraform apply

Terraform destroy

terraform destroy