Introduction

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. SQS eliminates the complexity and overhead associated with managing and operating message-oriented middleware, and empowers developers to focus on differentiating work.

In this lesson, we will learn how to receive messages from an SQS Queue with AWS CLI. We will cover the following topics:

• Prerequisites
• Setting up an SQS Queue
• Receiving Messages from an SQS Queue with AWS CLI
• Conclusion

Prerequisites

Before we get started, there are a few prerequisites that need to be in place.

• An AWS account
• AWS CLI installed and configured
• An IAM user with permissions to access SQS

Setting up an SQS Queue

The first step is to create an SQS Queue. To do this, we will use the AWS CLI.

First, we need to create a queue. We can do this with the following command:

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

This will create a queue with the name my-queue.

Next, we need to set the visibility timeout for the queue. This is the amount of time that a message will remain invisible to other consumers after it has been received. We can do this with the following command:

aws sqs set-queue-attributes --queue-url <queue-url> --attributes VisibilityTimeout=<timeout-in-seconds>

Replace <queue-url> with the URL of the queue you just created, and <timeout-in-seconds> with the desired visibility timeout in seconds.

Receiving Messages from an SQS Queue with AWS CLI

Now that we have our queue set up, we can start receiving messages from it. To do this, we will use the receive-message command.

The receive-message command takes a few parameters. The most important ones are QueueUrl and MaxNumberOfMessages.

QueueUrl is the URL of the queue from which you want to receive messages. MaxNumberOfMessages is the maximum number of messages you want to receive.

For example, to receive up to 10 messages from the queue we just created, we can use the following command:

aws sqs receive-message --queue-url <queue-url> --max-number-of-messages 10

This will return a JSON object containing the messages. Each message will have a MessageId and a Body field. The MessageId is a unique identifier for the message, and the Body is the actual message.

Conclusion

In this lesson, we learned how to receive messages from an SQS Queue with AWS CLI. We covered the prerequisites, setting up an SQS Queue, and receiving messages from an SQS Queue with AWS CLI.

By following the steps outlined in this lesson, you should now be able to receive messages from an SQS Queue with AWS CLI.