Support PrivateDnsNameOptions field in EC2 launch templates

[drakedevel]

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Description

Amazon recently launched support for IPv6-only subnets. Instances on these hosts use their instance ID for their private hostname, instead of the (non-existent) private IPv4 address. In this same announcement, they added support for opting-in to this behavior for other instances, via a new PrivateDnsNameOptions parameter passed to RunInstances, etc.

This issue is intended to be specifically about that new field in launch templates, but I'm happy to edit this issue to cover that field more broadly if desired.

New or Affected Resource(s)

• aws_launch_template (both resource and data source)

Potential Terraform Configuration

Mirroring the existing metadata_options approach:

resource "aws_launch_template" "my_template" {
  // ... existing fields
  private_dns_name_options {
    enable_resource_name_dns_aaaa_record = true
    enable_resource_name_dns_a_record    = true
    hostname_type                        = "resource-name" // Or "ip-name"
  }
}

For data "aws_launch_template" the same field can be exposed with the same structure.

References

• https://aws.amazon.com/blogs/networking-and-content-delivery/introducing-ipv6-only-subnets-and-ec2-instances/
• https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-naming.html
• https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_LaunchTemplatePrivateDnsNameOptionsRequest.html

[github-actions]

This functionality has been released in v4.6.0 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]

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