Heartbeat plus mon
From LVSKB
Introduction
The high availability of linux virtual server can be provided by using of mon, heartbeat and coda software. The "mon" is a general-purpose resource monitoring system, which can be used to monitor network service availability and server nodes. The "heartbeat" code currently provides the heartbeats among two node computers through serial line and UDP heartbeats. Fake is IP take-over software by using of ARP spoofing. The architecture of this solution is illustrated in the following figure.