What is Amazon Elastic Load Balancer

What is Amazon Elastic Load Balancer Amazon Elastic Load Balancing (Amazon ELB):ELB distributes the incoming application or network traffics across multiple targets, multiple targets could be EC2 instances, containers, and IP address in multiple AZ.

The advantage of ELB: ELB distribute workload across multiple compute resources.

ELB increases the availability and fault tolerance of your applications.

Easily add and remove compute resource without troubling your applications.

ELB use health check to monitor the status of compute resource so that ELB forward the request to an only healthy instance.

Features of Amazon ELB: Amazon ELB supports three type of Load balancing: You can choose load balancer as per your application's need.

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Classic Load Balancer Applications Load Balancer Network Load Balancer

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1- Classic Load Balancer: ➢ Classic ELB distributes traffic evenly across the AZ that you enable for your ELB. ➢ To distribute traffic evenly for each AZ it's recommended to enable cross-zone load balancing. ➢ When you have enabled cross-zone load balancing ELB distributes traffic evenly, let say you have two AZ one AZ have register 3 instances and Second AZ have 5 register instances. in this scenario, cross-zone load balancing will help out to distribute traffic evenly. ➢ Support for an EC2 classic. ➢ Support TCP and SSL listeners. ➢ Support for sticky sessions using application-generated cookies

2- Application Load Balancer: ➢ Application LB works on the Application layer of the OSI model. ➢ Application LB forwards the request to target groups. ➢ After receiving the request, it evaluates the listener rules in priority order to determine which rule to apply. ➢ Able to configure listener rules to route requests to different target group based on the content of application traffic. ➢ Support path based routing. ➢ Support host-based routing.

3- Network Load Balancer: ➢ ➢ ➢ ➢ ➢ ➢

Operate on the fourth layer of the OSI model.

It can handle millions of request per second.

Use the target group to distribute the coming request.

Support for Static IP address for the load balancer.

Support for registering targets by IP address including outside target of LB VPC. Support AWS ECS(Elastic container Service)

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