Support network_card_index in launch_template network_interfaces

[henighan]

Community Note

• Please vote on this issue by adding a 👍 reaction to the original issue to help the community and maintainers prioritize this request
• Please do not leave "+1" or other comments that do not add relevant new information or questions, they generate extra noise for issue followers and do not help prioritize the request
• If you are interested in working on this issue or have submitted a pull request, please leave a comment

Description

AWS cloudformation's AWS::EC2::LaunchTemplate NetworkInterface supports a NetworkCardIndex parameter, which is distinct from the NetworkInterfaceID parameter.
I do not see a network_card_index argument in the terraform aws_launch_template's network_interfaces block (though there is a network_interface_id argument).
To see this in the documentation, please compare terraform launch_template network_interfaces to AWS::EC2::LaunchTemplate NetworkInterface.
Is network_card_index not currently supported, or am I being silly? How difficult/what steps would be required to add support for it?

New or Affected Resource(s)

• aws_launch_template

Potential Terraform Configuration

N/A

References

https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/launch_template#network-interfaces
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-ec2-launchtemplate-networkinterface.html

• #0000

[AdamTylerLynch]

For clarification, when evaluating if an AWS Service supports a specific attribute, it is best to review the AWS API documentation, not the AWS CloudFormation documentation. While CloudFormation often mimics what the Service APIs have, it does not always.

The source of truth should always be the public API documentation.

https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_LaunchTemplateInstanceNetworkInterfaceSpecificationRequest.html

[henighan]

Thanks for the correction @AdamTylerLynch. Here's a description of the NetworkCardIndex copy-pasted from the above link:

NetworkCardIndex
The index of the network card. Some instance types support multiple network cards. The primary network interface must be assigned to network card index 0. The default is network card index 0.
Type: Integer
Required: No

[vara-bonthu]

@justinretzolk I have raised a PR for this issue/feature. Please do let me know if you need more details.

[github-actions]

This functionality has been released in v3.64.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.