How to create secondary private ip with AWS CDK?

Question

I cannot figure out how I can attach a secondary private IP to my primary ENI (eth0) with AWS CDK.

This is how I create my instance:

```
   const myVpc = new ec2.Vpc(this, "my-vpc", {
      maxAzs: 3,
    });

const mySecurityGroup = ...
  const imageDebian10 = ...
    
    new ec2.Instance(this, "my-instance", {
      instanceName: "my-instance",
      vpc: myVpc,
      vpcSubnets: {
        subnetType: ec2.SubnetType.PUBLIC,
      },
      availabilityZone: this.availabilityZones[0],
      securityGroup: mySecurityGroup,
      machineImage: imageDebian10,
      instanceType: ec2.InstanceType.of(
        ec2.InstanceClass.T2,
        ec2.InstanceSize.MICRO
      ),
    });
```

Answer

Hello

As far as i know that you cannot modify the Primary interface, Here are my recommendations for you, I have done something like this with Cloud-formation both any stack could be the same.

Procedure:

*  Create Two interaces or one interface eni(0) [I have created manually because there is custom requirement for us ]
* You can call One is primary and Second Interface as Secondary ENI
* You can refer those interfaces in your template

Primary network interface

Each instance has a default network interface, called the primary network interface. Y**ou cannot detach a primary network interface from an instance.** You can create and attach additional network interfaces. The maximum number of network interfaces that you can use varies by instance type. For more information, see[ IP addresses per network interface per instance type.](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#AvailableIpPerENI)

If you still have any questions please let me know

Thank You
GK

How to create secondary private ip with AWS CDK?

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