aws_launch_template device_index 0 is not set to eth0 for some reason

[daftkid]

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Terraform CLI and Terraform AWS Provider Version

Terraform v1.1.4
on darwin_amd64
+ provider registry.terraform.io/hashicorp/aws v4.6.0

Affected Resource(s)

• aws_launch_template

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

resource "aws_launch_template" "tpl-1" {
  name_prefix   = "${local.name_prefix}-1-lt-"
  image_id      = var.asg_instance_ami
  instance_type = var.asg_instance_type
  key_name      = aws_key_pair.key.key_name
  user_data     = base64encode(data.template_file.userdata.rendered)

  iam_instance_profile {
    name = aws_iam_instance_profile.instance_profile.name
  }

  block_device_mappings {
    device_name = "/dev/xvda"

    ebs {
      delete_on_termination = true
      volume_size           = var.asg_instance_root_volume_size
      volume_type           = var.asg_instance_root_volume_type
      encrypted             = var.asg_instance_root_volume_encrypted
      kms_key_id            = aws_kms_key.kms_key.arn
    }
  }

  network_interfaces {
    device_index         = 0
    network_interface_id = aws_network_interface.if-1-private.id
  }

  network_interfaces {
    device_index         = 1
    network_interface_id = aws_network_interface.if-1-mng.id
  }

  network_interfaces {
    device_index         = 2
    network_interface_id = aws_network_interface.if-1-public.id
  }

  lifecycle {
    create_before_destroy = true
  }

  tag_specifications {
    resource_type = "volume"
    tags          = { "Name" = "${local.name_prefix}-volume" }

  }
}

Debug Output

Panic Output

Expected Behavior

I want Terraform to create Launch template with Network interfaces mapping to device indices where device_index: 0 should be mapped to eth0, device_index: 1 to eth1 and so on.

Actual Behavior

I'm deploying this code in AWS China (Beijing) region and faced the issue: network interface with device_index = 0 is not mapped to eth0 in Launch template for some reason. Network interfaces with device index > 0 just are mapped correctly, I can see that launch template has mappings for eth1 and eth2. I can also see that interface with device_index = 0 is also present however it does not have mapping to eth0 and thus further ASG creation from this LT is failed with an error: Error creating Auto Scaling Group: InvalidQueryParameter: Incompatible launch template: Each network interface requires a unique device index.

Statefile has information that device_index for this "problematic" interface is 0.

Steps to Reproduce

1. terraform apply

Important Factoids

References

• #0000

[ewbankkit]

@daftkid Thanks for raising this issue.
It has already been noticed in #23766. I'm going to close this one as a duplicate so that we can concentrate discussion in the linked issue.
Please add any additional comments there.

[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.