Keepalived uses the IP Virtual Server (IPVS) kernel module to provide transport layer (Layer 4) load balancing, redirecting requests for network-based services to individual members of a server cluster. IPVS monitors the status of each server and uses the Virtual Router Redundancy Protocol (VRRP) to implement high availability.

The configuration file for the keepalived daemon is /etc/keepalived/keepalived.conf. This file must be present on each server on which you configure Keepalived for load balancing or high availability.

For more information, see http://www.keepalived.org/documentation.html, the /usr/share/doc/keepalive-version documentation, and the keepalived(8) and keepalived.conf(5) manual pages.