Heartbeat ：
UDP 694
heartbeat v2
ha web
node1 , node2
节点名称， /etc/hosts
节点名称必须跟uname -n 命令的执行结果一致
ssh互信通信
时间同步
Heartbeat Heartbeat subsystem for High-Availability Linux
heartbeat-devel Heartbeat development package
heartbeat-gui Provides a gui interface to manage heartbeat clusters
heartbeat-ldirectord 图形化管理界面 为ipvs高可用提供规则自动生成及后端realserver健康状态检查的组件 ；
heartbeat-pils Provides a general plugin and interface loading library
heartbeat-stonith Provides an interface to shoot The Other Node In the Head
来源：https://blog.51cto.com/14087650/2428139