Introduction

In this lesson, we will learn how to create an SQS Dead Letter Queue with AWS CLI. Amazon Simple Queue Service (SQS) is a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. Dead Letter Queues (DLQs) are used to store messages that cannot be processed successfully by the consumer. This lesson will provide a practical approach to learn how to create an SQS Dead Letter Queue with AWS CLI.

What is an SQS Dead Letter Queue?

A Dead Letter Queue (DLQ) is a queue that stores messages that cannot be processed successfully by the consumer. When a message is sent to an SQS queue, it is processed by the consumer. If the consumer is unable to process the message, it is sent to the DLQ. The DLQ is used to store messages that cannot be processed successfully by the consumer.

Prerequisites

Before you begin this lesson, you should have a basic understanding of Amazon Web Services (AWS) and the AWS Command Line Interface (CLI). You should also have an AWS account and have the AWS CLI installed and configured.

Creating an SQS Dead Letter Queue

In this section, we will learn how to create an SQS Dead Letter Queue with AWS CLI.

Step 1: Create an SQS Queue

The first step is to create an SQS queue. To do this, we will use the aws sqs create-queue command. This command takes a QueueName parameter, which is the name of the queue you want to create.

aws sqs create-queue --queue-name my-sqs-queue

Step 2: Create an SQS Dead Letter Queue

The next step is to create an SQS Dead Letter Queue. To do this, we will use the aws sqs create-queue command. This command takes a QueueName parameter, which is the name of the queue you want to create. We will also use the --attributes parameter to specify the RedrivePolicy attribute. This attribute is used to specify the queue that will be used as the DLQ.

aws sqs create-queue --queue-name my-sqs-dlq --attributes '{"RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:123456789012:my-sqs-queue\",\"maxReceiveCount\":\"5\"}"}'

Step 3: Set the Redrive Policy

The final step is to set the Redrive Policy on the SQS queue. To do this, we will use the aws sqs set-queue-attributes command. This command takes a QueueUrl parameter, which is the URL of the queue you want to set the attributes for. We will also use the --attributes parameter to specify the RedrivePolicy attribute. This attribute is used to specify the queue that will be used as the DLQ.

aws sqs set-queue-attributes --queue-url https://sqs.us-east-1.amazonaws.com/123456789012/my-sqs-queue --attributes '{"RedrivePolicy": "{\"deadLetterTargetArn\":\"arn:aws:sqs:us-east-1:123456789012:my-sqs-dlq\",\"maxReceiveCount\":\"5\"}"}'

Conclusion

In this lesson, we learned how to create an SQS Dead Letter Queue with AWS CLI. We started by creating an SQS queue and then created an SQS Dead Letter Queue. Finally, we set the Redrive Policy on the SQS queue to specify the queue that will be used as the DLQ. By following the steps outlined in this lesson, you should now be able to create an SQS Dead Letter Queue with AWS CLI.