（两台KA1和KA2服务器重启nginx、keepalived服务）
[root@centos-1~]# /usr/local/nginx/sbin/nginx -t
nginx:the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx:configuration file /usr/local/nginx/conf/nginx.conf test is successful ###检查配置文件没问题后再执行重启nginx。
[root@centos-1~]# /usr/local/nginx/sbin/nginx -s reload
[root@centos-4~]# /usr/local/nginx/sbin/nginx -t
nginx:the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx:configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@centos-4~]# /usr/local/nginx/sbin/nginx -s reload
[root@centos-1~]# service keepalived restart
停止keepalived： [确定]
正在启动keepalived： [确定]
[root@centos-4~]# service keepalived restart
停止keepalived： [确定]
正在启动keepalived： [确定]
四、测试：
验证方法（保证从负载均衡器本机到后端真实服务器之间能正常通信）：
（1）、先测试完成后的效果访问vip1、vip2
[root@centos-1 ~]# curl 192.168.5.200
10.2
[root@centos-1 ~]# curl 192.168.5.210
10.3
（注意在KA1、KA2上做了缓存和ip_hash）
（2）、把KA1keepalived stop掉（模拟KA1主机的keepalived故障）
[root@centos-1 ~]# service keepalived stop
停止 keepalived：
[root@centos-1 ~]# ip addr
2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen1000
link/ether 00:0c:29:0d:f3:5d brd ff:ff:ff:ff:ff:ff
inet 192.168.5.129/24 brd 192.168.5.255 scope global eth0
inet6 fe80::20c:29ff:fe0d:f35d/64 scope link
valid_lft forever preferred_lft forever
（KA1主机上查看ip addr已经没有vip了。）
在KA2主机上查看日志文件：
[root@centos-4 ~]# cat /var/log/messages
Oct 19 23:20:46 centos-4Keepalived_vrrp[15412]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for192.168.5.200
Oct 19 23:20:46 centos-4avahi-daemon[1513]: Registering new address record for 192.168.5.200 oneth0.IPv4.
Oct 19 23:20:46 centos-4 Keepalived_healthcheckers[15411]:Netlink reflector reports IP 192.168.5.200 added
Oct 19 23:20:51 centos-4Keepalived_vrrp[15412]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for192.168.5.200
（日志文件显示已经把vip：192.168.5.200接管了）
查看KA2主机的ip addr
[root@centos-4 ~]# ip addr
2: eth0:<BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen1000
link/ether 00:50:56:3a:84:30 brd ff:ff:ff:ff:ff:ff
inet 192.168.5.128/24 brd 192.168.5.255 scope global eth0
inet 192.168.5.210/32 scope global eth0
inet 192.168.5.200/32 scope global eth0
（可以看到已经有两个vip）
检查nginx服务是否被KA2接管且不中断
[root@centos-1 ~]# curl 192.168.5.210
10.3
[root@centos-1 ~]# curl 192.168.5.200
10.2
（可以看到服务还是进行的而且缓存还在。ip_hash的作用）
一些关于Keepalived相关教程集合：
CentOS 7下Keepalived + HAProxy 搭建配置详解