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Accepted
Anthony Kong
Asked: 2019-07-10 23:34:19 +0800 CST

How to fix the lack of Elastic Network Adapter (ENA) in old AMI images which prevents instance launch?

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I have an old AMI which used to run on a c4.large machine.

Since this class is not available an all AZ, I picked a c5.large to restore the image to.

However, when I run terraform to restore, I got this error message:

1 error(s) occurred:

  • aws_instance.convertor: 1 error(s) occurred:

  • aws_instance.convertor: Error launching source instance: InvalidParameterCombination: Enhanced networking with the Elastic Network Adapter (ENA) is required for the 'c5.large' instance type. Ensure that you are using an AMI that is enabled for ENA. status code: 400, request id: 7f32e7a1-c201-4db3-9f9e-6da4657ba9c8

How I can find which instance type can accept this old AMI? Or is there anything I can apply to the AMI to work with newer instance type?

amazon-ec2

1 Answers

  1. Best Answer

    You have to use AMI which has ENA enabled option.
    Follow these instructions:

    Enhanced Networking ENA

    Do not forget to set: 

    aws ec2 modify-instance-attribute --instance-id instance_id --ena-support
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