resource/aws_backup_selection: IAM Role cannot be assumed by AWS Backup

[bflad]

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Terraform Version

Terraform v0.12.3
+ provider.aws v2.18.0

Affected Resource(s)

• aws_backup_selection

Terraform Configuration Files

terraform {
  required_providers {
    aws = "2.18.0"
  }
}

provider "aws" {
  region = "us-east-2"
}

data "aws_caller_identity" "current" {}

data "aws_region" "current" {}

resource "aws_iam_role" "test" {
  name               = "9269-testing"
  assume_role_policy = <<POLICY
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Action": ["sts:AssumeRole"],
      "Effect": "allow",
      "Principal": {
        "Service": ["backup.amazonaws.com"]
      }
    }
  ]
}
POLICY
}

resource "aws_iam_role_policy_attachment" "test" {
  policy_arn = "arn:aws:iam::aws:policy/service-role/AWSBackupServiceRolePolicyForBackup"
  role = "${aws_iam_role.test.name}"
}

resource "aws_backup_vault" "test" {
  name = "9269-testing"
}

resource "aws_backup_plan" "test" {
  name = "9269-testing"

  rule {
    rule_name = "test"
    target_vault_name = "${aws_backup_vault.test.name}"
    schedule = "cron(0 12 * * ? *)"
  }
}

resource "aws_backup_selection" "test" {
  iam_role_arn = "${aws_iam_role.test.arn}"
  name = "9269-testing"
  plan_id = "${aws_backup_plan.test.id}"

  resources = [
    "arn:aws:ec2:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:volume/*",
  ]
}

Expected Behavior

Successful AWS Backup Selection creation.

Actual Behavior

Error: error creating Backup Selection: InvalidParameterValueException: IAM Role arn:aws:iam::--OMITTED--:role/9269-testing cannot be assumed by AWS Backup

Steps to Reproduce

1. terraform init
2. terraform apply

Important Factoids

Retrying terraform apply works. Appears to be IAM eventual consistency issue.

[bflad]

Bug fix submitted: #9298

[nywilken]

The fix to the aws_backup_selection resource has been merged and will be released with version 2.19.0 of the Terraform AWS provider.

[bflad]

This has been released in version 2.19.0 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!

[tbugfinder]

I'm wondering if anybody else could execute above code using tf 0.11.14 or tf 0.12.10 ?

In my case it complains about the *.

[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!