aws_launch_template network interfaces default settings

[jasonrojas]

aws_launch_template network_network interfaces should set "delete_on_termination" to true as a default setting.

Per a support case I opened with aws, if this key is not set to true then autoscaling policies will orphan network interfaces without re-using them and essentially cause your account to hit a network interface limit over time.

Currently the key defaults to false which causes this behavior.

From aws support:

With an AutoScaling Launch Configuration this option is not configurable and is set to "True" by default. However, when using an EC2 Launch Template (the replacement mechanism for AutoScaling Launch Configurations), this option is exposed and configurable.

Can you please check your EC2 Launch Templates and ensure that the setting "Delete on termination" for ENIs is set to "Yes" or set the entire Networks Interfaces section to "Don't include on launch template" or delete the row entirely.?

If you have "upgraded" your Launch Configuration to a Launch Template, the default setting for ENIs is either "NOT_SET" or the entire row for the Network Interfaces section is not defined. In either case, the default behavior is to "Delete on Termination = True". To edit existing Launch Templates, click on the 'Create launch template' button and select "Create a new template version" and select the existing Launch Template for 'Launch template name' as well as the 'Source template'. Ensure to set a version description such as "ENI Delete on Termination set" or the like. Then in the Network Interfaces section, either delete the existing setting or change the 'Delete on Termination' setting to "Yes". Then finish by creating the launch template.

It sounds like there is a difference between what the terraform provider's defaults are and what the aws defaults are.

[ghost]

This has been released in version 3.0.0 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 for triage. Thanks!

[ghost]

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