How to Set Up a Redrive Policy for SQS Queues Using Terraform

When working with Amazon Simple Queue Service (SQS) queues, it's essential to set up a redrive policy to handle messages that fail processing. In this article, we'll explore how to create a redrive policy for your SQS queues using Terraform.

The Importance of Redrive Policies

A redrive policy determines whether to create a dead letter queue (DLQ) for failed messages and specifies the maximum number of times a message can be delivered before it's moved to the DLQ. This ensures that critical messages are not lost in case of processing failures.

Error Messages When Setting Redrive Policy

When attempting to set up a redrive policy using Terraform, you may encounter error messages related to the `deadLetterTargetArn` parameter. For example:

```

Reason: Invalid value for deadLetterTargetArn.

Description: Determines whether to create a redrive allow policy for the dead letter queue.

Resource 'aws_sqs_queue' 'CloudTrail_SQS' for parameter RedrivePolicy is invalid.

```

Fixing the Error

To resolve this issue, ensure that you're providing valid values for your redrive policy. Specifically:

1. Make sure to specify `deadLetterTargetArn` correctly by providing the ARN of the dead letter queue.

2. Ensure that `maxReceiveCount` is specified as an integer (e.g., `5`) and not a string.

Creating Redrive Policies with Terraform

To set up a redrive policy using Terraform, you can use the `redrivepolicy` argument in your `aws_sqs_queue` resource. The JSON policy should be provided as a string:

```hcl

resource 'aws_sqs_queue' 'CloudTrail_SQS' {

name = 'CloudTrail_SQS'

redrive_policy = jsonencode({

maxReceiveCount = 5,

deadLetterTargetArn = aws_sqs_queue.dlq.arn

})

}

```

In this example, we're setting up a redrive policy that allows messages to be received up to five times before moving them to the dead letter queue.

Setting up a redrive policy for your SQS queues using Terraform is crucial for handling failed messages and ensuring critical data isn't lost. By following the guidelines outlined in this article, you can resolve common error messages related to `deadLetterTargetArn` and successfully create a redrive policy for your SQS queues.

References

For more information about building AWS IAM policy documents with Terraform, see the 'AWS IAM Policy Document Guide'(https://docs.aws.amazon.com/IAM/latest/UserGuide/policy-document.html).

I hope you find this article helpful. Let me know if you have any questions or need further clarification on setting up redrive policies for your SQS queues using Terraform.

Sqs queue policy terraform