AWS Certified Solutions Architect Associate All-in-One Exam Guide (Exam SAA-C01) by Joyjeet Banerjee

Author:Joyjeet Banerjee [Joyjeet Banerjee]
Language: eng
Format: epub
Publisher: McGraw-Hill
Published: 2018-09-06T16:00:00+00:00

How ELB Works

Let’s understand how a load balancer works. You might be wondering how a load balancer offers high availability. Is there a possibility of ELB going down? Internally, every single Elastic Load Balancing instance utilizes multiple AZs. Even if you do not deploy your application or workload across multiple AZs (which is always recommended), the load balancers that you are going to use will be always deployed across multiple AZs.

In Figure 6-8, you will notice that in the customer VPC, the EC2 instances are deployed in two different AZs. The customer also hooked up an ELB with both the EC2 instances. Internally, there will be multiple load balancers deployed in a separate ELB VPC, spanning multiple AZs to provide a highly available architecture. This part will be transparent to you; you don’t have to do anything to configure the high availability for the load balancer. AWS will manage everything for you automatically, and there is no separate charge for that. As a result, you get highly available load balancers with zero overhead of manageability.

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