Terraform: Resource `aws_sqs_queue.redrive` shows changes when there are no changes

[conorgil]

Each time I run terraform plan without changing anything about the aws_sqs_queue resource, it always shows the redrive_policy field as modified. Upon review, I can see the changes it shows are only related to white space (new lines).

Given:

resource "aws_sqs_queue" "my_queue" {
  name = "my_queue"
  delay_seconds = 0
  visibility_timeout_seconds = 300

  redrive_policy = <<EOF
{
    "maxReceiveCount": "3",
    "deadLetterTargetArn": "${aws_sqs_queue.my_dead_letter_queue.arn}"
}
EOF
}

resource "aws_sqs_queue" "my_dead_letter_queue" {
  name = "my_dead_letter_queue"
}

Running terraform apply and then terraform plan yields changes. I expect it to yield no changes.

~ aws_sqs_queue.audit_queue
    redrive_policy: "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:1234:my-dead-letter-queue\",\"maxReceiveCount\":3}" => "{\n    \"maxReceiveCount\": \"3\",\n    \"my-deadLetterTargetArn\": \"arn:aws:sqs:us-east-1:123:dead-letter-queue\"\n}\n"

[AlexWiles]

:+1: seeing the same thing

resource "template_file" "my_redrive_policy" {
  template = "${file("${path.module}/sqs_redrive_policy.json.tpl")}"
  vars {
    max_receive_count = "10"
    target_arn = "${aws_sqs_queue.my_dead_queue.arn}"
  }
}

resource "aws_sqs_queue" "my_queue" {
  name = "sender-${var.environment_name}"
  redrive_policy = "${template_file.my_redrive_policy.rendered}"
}

sqs_redrive_policy.json.tpl

{
  "maxReceiveCount": "${max_receive_count}",
  "deadLetterTargetArn": "${target_arn}"
}

the order of 'maxReceiveCount' & 'deadLetterTargetArn' in the rendered redrive policy template keep switching on planning.

[ghost]

Same here, Terraform v0.6.12.

[catsby]

Hey Friends –

I've opened https://github.com/hashicorp/terraform/pull/5888 to patch this. It's 1 part code fix, one part documentation; the maxReceiveCount needs to be an integer, not a string, so:

  redrive_policy = <<EOF
{
    "maxReceiveCount": 3,
    "deadLetterTargetArn": "${aws_sqs_queue.my_dead_letter_queue.arn}"
}
EOF
}

Unfortunately, because this is a JSON I can't immediately inspect it and format automatically, so you'll need to make that correction.

[geek876]

@catsby How do you pass integer if we were to set maxReceiveCount via terraform.tfvars ?

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