Elastic Load Balancer (ELB) – Basic understanding

Load balancers are used to enhance Security, Reliability and Scalability. It distributes the incoming traffic among healthy EC2 instance, IP address and containers in a automated way. With this feature once can achieve fault tolerance for any application. ELB offers three types of Load Balancers.

Application Load Balancer: It operates at layer 7 and used for HTTP and HTTPS traffic.

Network Load Balancer: It operates at layer 4 and used for TCP traffics.

Classic Load Balancer: It operates on both request level and connection level.

An ELB can be Internet facing or Internal load balancer. Let us have a look at Classic Load Balancer.

To ensure that the ELB service can scale ELB nodes in each AZ

• Ensure that the subnet defined for the load balancer is at least /27 in size.
• At least 8 available IP address so ELB nodes can use to scale.

This was just a basic about ELB in next article will discuss about configuration and important features.

Hope this was helpful information for you.....

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