ec2_transit_gateway_vpc_attachment: add support for "enable_appliance_mode"

[nckbnv]

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Description

AWS has just released a new type of load balancer named Gateway Load Balancer.
It supports three design options:

• North-South inspection (VPC to/from Internet) via GLWB and IGW (Internet Gateway) covered by Support Gateway Load Balancers, Gateway Load Balancer VPC Endpoint Services, and VPC Endpoint Routes #16129 and released in provider version 3.15
• North-South inspection (VPC to/from Internet) via GLWB and TGW (Transit Gateway)
• East-West (Inter-VPC traffic inspection) via GLWB and TGW

In order to prevent asymmetric routing between GLWB and TGW (so one session could always hit the proper firewall appliance) you need to enable Appliance mode in the transit gateway vpc attachment (as described in the Appliance VPC documentation)

This feature enhancement request is opened based on a suggestion by @bflad made in 16129.

New or Affected Resource(s)

• ec2_transit_gateway_vpc_attachment

Potential Terraform Configuration

resource "aws_ec2_transit_gateway_vpc_attachment" "example" {
  subnet_ids         = [aws_subnet.example.id]
  transit_gateway_id = aws_ec2_transit_gateway.example.id
  vpc_id             = aws_vpc.example.id
  appliance_mode = true
}

References

• Support Gateway Load Balancers, Gateway Load Balancer VPC Endpoint Services, and VPC Endpoint Routes #16129

[bflad]

Support for this functionality has been merged and will release with version 3.15.0 of the Terraform AWS Provider, today or tomorrow. Thanks to @philnichol for the implementation. 👍

[ghost]

This has been released in version 3.15.0 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]

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 feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!