Redundant resources are integral to providing high availability in a cluster. But just as important are putting the tools and mechanisms in place to ensure that these services remain available. In the event of a resource failure, these ensure that services are directed to the functional resources in a cluster. In this lesson, we will learn about
keepalived, which is used to keep the load balancer highly-available and
ldirectord, which is used to monitor and administer the backend servers in an LVS cluster.