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You're reading from AWS Certified Developer ??? Associate Guide Your one-stop solution to passing the AWS developer's certification

Product type Paperback

Published in Sep 2017

Publisher Packt

ISBN-13 9781787125629

Length 600 pages

Edition 1st Edition

Tools

AWS

Concepts

Cloud Computing

Authors (2):

Tankariya

Parmar

View More author details

Table of Contents (29) Chapters

Title Page

Credits

About the Author

Acknowledgments

About the Author

About the Reviewer

www.PacktPub.com

Customer Feedback

Dedication

Preface

1. AWS Certified Developer – Associate Certification FREE CHAPTER

2. Introduction to Cloud Computing and AWS

3. Identity and Access Management

4. Virtual Private Clouds

5. Getting Started with Elastic Compute Cloud

6. Handling Application Traffic with Elastic Load Balancing

7. Monitoring with CloudWatch

8. Simple Storage Service, Glacier, and CloudFront

9. Other AWS Storage Options

10. AWS Relational Database Services

11. AWS DynamoDB - A NoSQL Database Service

12. Amazon Simple Queue Service

13. Simple Notification Service

14. Simple Workflow Service

15. AWS CloudFormation

16. Elastic Beanstalk

17. Overview of AWS Lambda

18. Mock Tests

Index

Introduction to the Elastic Load Balancer

An Elastic Load Balancer (ELB) is an AWS service that automatically distributes incoming network or application traffic to a number of EC2 instances. It monitors the health of each of the EC2 instances associated with it and forwards traffic only to healthy instances. An ELB provides a single point of contact for the EC2 instances behind the ELB. Each of the EC2 instances is marked with a status, either InService if it is healthy, or OutOfService if it is unhealthy. Traffic is routed only to InService instances. An ELB provides a single point of contact for the application traffic that is hosted on multiple EC2 instances. By routing traffic only to healthy instances, an ELB provides fault tolerance to the application and ensures high availability of the application:

Benefits of using an ELB

An ELB provides high availability, fault tolerance, elasticity, and security to your environment. We will now look at the benefits of an ELB in brief: