Question 231774 in Amazon Web Sevices Question posted in
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Amazon web services – Can I add another network interface to my EC2 instance at launch?

My machine image requires 2 network interfaces. I want to avoid having to manually do that after the instance is brought up. Is there a way to add the 2nd network interface during Launch? either in the AWS GUI or scripted way, I am open to both.

I know how to add the second interface to an instance after it has been created. I would like to minimize the amount of work I have to do after the fact. I want to streamline this part of the process to make it easier for the users to consume this image.

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2

Answers


  1. 0

    Yes you can add ENIs to an EC2 during configuration via the Console. To do this, start launching an instance and go to Network Settings > Advanced Network Configuration > Add Network Interface.

    Just know the number of ENIs you can add is dependent on your instance type. This info can be found here: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-eni.html#AvailableIpPerENI

    If you want this automated, use Infrastructure as Code or the create a script that uses the AWS CLI

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  2. 0

    If you don’t want to manually add another network interface, you can try add this script at the user data of EC2 instances

    #!/bin/bash

# Install AWS CLI (if not already installed, this is install command for amazon linux)
yum install -y aws-cli

# Get the instance ID of the current instance
INSTANCE_ID=$(curl -s http://169.254.169.254/latest/meta-data/instance-id)

# Create a new network interface
NEW_INTERFACE_ID=$(aws ec2 create-network-interface --subnet-id subnet-xxxxxxxx --groups sg-xxxxxxxx --query 'NetworkInterface.NetworkInterfaceId' --output text)

# Attach the new network interface to the instance
aws ec2 attach-network-interface --network-interface-id $NEW_INTERFACE_ID --instance-id $INSTANCE_ID --device-index 1
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