Description:

The main goal of the keepalived project is to add a strong & robust
keepalive facility to the Linux Virtual Server project. This project
is written in C with multilayer TCP/IP stack checks. Keepalived
implements a framework based on three family checks: Layer3, Layer4 &
Layer5. This framework gives the daemon the ability of checking a LVS
server pool states. When one of the server of the LVS server pool is
down, keepalived informs the Linux kernel via a setsockopt call to
remove this server entry from the LVS topology. In addition keepalived
implements a VRRPv2 stack to handle director failover. So in short
keepalived is a userspace daemon for LVS cluster nodes healthchecks
and LVS directors failover.