Keepalived VIP自动切换

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Keepalived VIP 切换的两种情况：

1.keepalived 进程被停止。

2.keepalived 中 track_script 检测失败。

haproxy 检测：

vrrp_script chk_haproxy {
script “killall -0 haproxy” # cheaper than pidof
interval 2 # check every 2 seconds
weight -2
}

切换相关日志：tail -f /var/log/messages

Keepalived_vrrp[32408]: VRRP_Script(chk_haproxy) failed
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Received higher prio advert
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Entering BACKUP STATE
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) removing protocol VIPs.
Keepalived_vrrp[32408]: VRRP_Script(chk_haproxy) succeeded
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) forcing a new MASTER election
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) forcing a new MASTER election
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Transition to MASTER STATE
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Entering MASTER STATE
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) setting protocol VIPs.
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 10.1.1.56
Keepalived_vrrp[32408]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth1 for 10.1.1.56

切换失败的情况：

keepalived 进程被停止时 VIP 可以正常切换，keepalived 进程运行状态下，haproxy 相关服务停止后，VIP 未如期进行切换。

分析：

停止 haproxy 服务，手动执行 killall -0 haproxy && echo “success” || echo “fail”，返回结果是 success。

停止 haproxy 服务后，ps aux |grep haproxy 发现还有一个正常启动的 haproxy，killall -9 haproxy 后发现 tail -f /var/log/messages 出现 VIP 正常切换的日志。

Linux 下 HAProxy+Keepalived 双机高可用方案 http://www.linuxidc.com/Linux/2016-02/128566.htm

Haproxy+Keepalived 搭建 Weblogic 高可用负载均衡集群 http://www.linuxidc.com/Linux/2013-09/89732.htm

Keepalived+HAProxy 配置高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/56748.htm

CentOS 6.3 下 Haproxy+Keepalived+Apache 配置笔记 http://www.linuxidc.com/Linux/2013-06/85598.htm

Haproxy + KeepAlived 实现 WEB 群集 on CentOS 6 http://www.linuxidc.com/Linux/2012-03/55672.htm

Haproxy+Keepalived 构建高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/55880.htm

本文永久更新链接地址 ：http://www.linuxidc.com/Linux/2016-03/129015.htm