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Feb 14, 2025
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elastic-load-balancing-v2

README.md

Elastic Load Balancing - Version 2 code examples for the SDK for JavaScript (v3)

Overview

Shows how to use the AWS SDK for JavaScript (v3) to work with Elastic Load Balancing - Version 2.

Elastic Load Balancing - Version 2 automatically distributes your incoming traffic across multiple targets, such as EC2 instances, containers, and IP addresses, in one or more Availability Zones.

⚠ Important

  • Running this code might result in charges to your AWS account. For more details, see AWS Pricing and Free Tier.
  • Running the tests might result in charges to your AWS account.
  • We recommend that you grant your code least privilege. At most, grant only the minimum permissions required to perform the task. For more information, see Grant least privilege.
  • This code is not tested in every AWS Region. For more information, see AWS Regional Services.

Code examples

Prerequisites

For prerequisites, see the README in the javascriptv3 folder.

Get started

Single actions

Code excerpts that show you how to call individual service functions.

Scenarios

Code examples that show you how to accomplish a specific task by calling multiple functions within the same service.

Run the examples

Instructions

Note: All code examples are written in ECMAscript 6 (ES6). For guidelines on converting to CommonJS, see JavaScript ES6/CommonJS syntax.

Run a single action

node ./actions/<fileName>

Run a scenario

Most scenarios can be run with the following command:

node ./scenarios/<fileName>

Run with options

Some actions and scenarios can be run with options from the command line:

node ./scenarios/<fileName> --option1 --option2

util.parseArgs is used to configure these options. For the specific options available to each script, see the parseArgs usage for that file.

Hello Elastic Load Balancing - Version 2

This example shows you how to get started using Elastic Load Balancing - Version 2.

node ./hello.js

Build and manage a resilient service

This example shows you how to create a load-balanced web service that returns book, movie, and song recommendations. The example shows how the service responds to failures, and how to restructure the service for more resilience when failures occur.

  • Use an Amazon EC2 Auto Scaling group to create Amazon Elastic Compute Cloud (Amazon EC2) instances based on a launch template and to keep the number of instances in a specified range.
  • Handle and distribute HTTP requests with Elastic Load Balancing.
  • Monitor the health of instances in an Auto Scaling group and forward requests only to healthy instances.
  • Run a Python web server on each EC2 instance to handle HTTP requests. The web server responds with recommendations and health checks.
  • Simulate a recommendation service with an Amazon DynamoDB table.
  • Control web server response to requests and health checks by updating AWS Systems Manager parameters.

Tests

⚠ Running tests might result in charges to your AWS account.

To find instructions for running these tests, see the README in the javascriptv3 folder.

Additional resources

Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0