A load balancer distributes incoming traffic across your EC2 instances. This enables you to increase the availability of your application. The load balancer also monitors the health of its registered instances and ensures that it routes traffic only to healthy instances. You configure your load balancer to accept incoming traffic by specifying one or more listeners, which are configured with a protocol and port number for connections from clients to the load balancer and a protocol and port number for connections from the load balancer to the instances. For more information, see the Elastic Load Balancing Developer Guide.
For information about the AWS regions supported by Elastic Load Balancing, see Regions and Endpoints - Elastic Load Balancing in the Amazon Web Services General Reference.
All Elastic Load Balancing operations are idempotent, which means that they complete at most one time. If you repeat an operation, it succeeds with a 200 OK response code.
This document was last published on May 25, 2016.