You can combine the Keepalived and HAProxy load balancer features to achieve a high-availability, load-balancing environment. HAProxy provides scalability, application-aware functionality, and ease of configuration when configuring load balancing services. Keepalived provides failover services for backup routers, and the ability to distribute loads across servers for increased availability.

This complex configuration scenario illustrates how you can use different load balancing applications with each other to achieve better redundancy and take advantage of features at different layers of the stack. While this example shows how Keepalived can be used to provide redundancy for HAProxy, you can also achieve similar results by using Keepalived with other application layer proxy systems, such as NGINX.

For more details, see Enhancing Load Balancing by Using Keepalived With HAProxy.