Creating an Elastic Load Balancer and attaching to EC2 instances

Often, for the purpose of load balancing, as well as to achieve high availability, we may choose to serve the traffic using a load balancer. AWS provides a virtual load balancer, called Elastic Load Balancer (ELB), which can be used to receive traffic from clients and route the traffic to a set of instances which are attached to the ELB. Apart from stability, the ELB has quite a few features which can help in improving the overall uptime. One of the most important of these features is health check. This lets ELB determine that an attached instance has gone bad and it should stop routing traffic to it. ELB can also insert cookies which can be used for making routing decisions and it can be used to offload SSL from an application.

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