cdk eni attach instance

cdk-eni-ec2.ts

import { App, CfnOutput, Construct, Stack, StackProps } from '@aws-cdk/core';
import * as ec2 from '@aws-cdk/aws-ec2';

export class MyStack extends Stack {
  constructor(scope: Construct, id: string, props: StackProps = {}) {
    super(scope, id, props);

    const vpc = ec2.Vpc.fromLookup(this, 'Vpc', { isDefault: true });

    const subnetId = vpc.privateSubnets[0].subnetId;

    const eni = new ec2.CfnNetworkInterface(this, 'ENI', {
      subnetId,
    })

    const instance = new ec2.Instance(this, 'Instance', {
      vpc, 
      vpcSubnets: {
        subnets: [ ec2.Subnet.fromSubnetAttributes(this, 'Subnet', {
          subnetId,
          availabilityZone: vpc.privateSubnets[0].availabilityZone,
        })]
      },
      instanceType: new ec2.InstanceType('t3.large'),
      machineImage: new ec2.AmazonLinuxImage({
        generation: ec2.AmazonLinuxGeneration.AMAZON_LINUX_2,
      }),
    })
    
    // attachment
    new ec2.CfnNetworkInterfaceAttachment(this, 'Attach', {
      instanceId: instance.instanceId,
      deviceIndex:'1',
      networkInterfaceId: eni.ref,
    })

    new CfnOutput(this, 'IP', { value: eni.attrPrimaryPrivateIpAddress })

  }
}

// for development, use account/region from cdk cli
const devEnv = {
  account: process.env.CDK_DEFAULT_ACCOUNT,
  region: process.env.CDK_DEFAULT_REGION,
};

const app = new App();

new MyStack(app, 'my-stack-dev', { env: devEnv });
// new MyStack(app, 'my-stack-prod', { env: prodEnv });

app.synth();