[Bug]: The resource aws_instance does not import network interface block.

[rutujachaudhari124]

Terraform Core Version

0.12.31

AWS Provider Version

2.70.0

Affected Resource(s)

aws_instance

Expected Behavior

When resource aws_instance is imported, the network interface block must be added to the state file with other parameters which contains the information of the network interface attached, similar to the ebs block devices.

Terraform import should add details in such format in the state file after import:

"network_interface": [ { "delete_on_termination": false, "device_index": 0, "network_interface_id": "*****" } ],

Actual Behavior

When this resource aws_instance is imported, in the tf state file we can see that the network_interface details are not added. It is mentioned as network_interface = [].

The id of primary network_interface is visible as an attribute in the state file, but the network interface block seems empty.

Relevant Error/Panic Output Snippet

When we add the network interface configuration, and perform terraform apply, the force replacement is observed and we can see 1 to add and 1 to destroy. It tries to destroy and recreate.

Error:
 + network_interface { # forces replacement
          + delete_on_termination = false
          + device_index          = 0
          + network_interface_id  = "****************"
        }

      ~ root_block_device {
          ~ delete_on_termination = true -> (known after apply)
          ~ device_name           = "/dev/xvda" -> (known after apply)
          ~ encrypted             = false -> (known after apply)
          ~ iops                  = 100 -> (known after apply)
          + kms_key_id            = (known after apply)
          ~ volume_id             = "***************" -> (known after apply)
          ~ volume_size           = 8 -> (known after apply)
          ~ volume_type           = "gp2" -> (known after apply)
        }

      - timeouts {}
    }

Plan: 1 to add, 0 to change, 1 to destroy.

Terraform Configuration Files

resource "aws_instance" "instance-01" {
  ami           = "*******************"
  instance_type = "t2.micro"

  network_interface {
    network_interface_id = "******************"
    device_index         = 0
  }

  tags = {
    Name = "instance-01"
  }
}

Steps to Reproduce

Step 1: create instance Step 2: import instance using command : terraform import aws_instance.instance-01 Step 3: terraform apply

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

https://github.com/hashicorp/terraform-provider-aws/issues/1446

Would you like to implement a fix?

None

[github-actions[bot]]

Community Note

Voting for Prioritization

• Please vote on this issue by adding a 👍 reaction to the original post to help the community and maintainers prioritize this request.
• Please see our prioritization guide for information on how we prioritize.
• 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.

Volunteering to Work on This Issue

• If you are interested in working on this issue, please leave a comment.
• If this would be your first contribution, please review the contribution guide.

[justinretzolk]

Hey @rutujachaudhari124 👋 Thank you for taking the time to raise this! It looks like you're using a fairly old version of both Terraform core and the AWS Provider. Are you able to test on a more recent version to verify if the import is successful?

[rutujachaudhari124]

yes, I have checked in the latest version (4.60.0), still could not resolve this issue. The network interface is still not added to state file.

[danilobovo]

I'm using the latest version of terraform provider (v5.64.0) and the issue still occurring.