Nginx/LVS/HAProxy是目前使用最广泛的三种负载均衡软件。

A.keepalived是保持存活的意思
B.keepalived在网络里面就是保持在线了，也就是所谓的高可用或热备
C.keepalived不是用来防止单点故障的
D.Keepalived就是巧用VRRP协议来实现高可用性（HA）的

A./etc/keepalived/keepalived.conf
B./etc/keepalived.conf
C./usr/local/etc/keepalived.conf
D./usr/local/keepalived/etc/keepalived.conf