cat  /usr/mysql/chk_mysql.sh

#!/bin/bash
counter=$(netstat -na|grep "LISTEN"|grep "3306"|wc -l)
if [ "${counter}" -eq 0 ]; then systemctl stop keepalived
fi  

!Configuration File for keepalived     
global_defs {
notification_email {
ceshi@qq.com
}       
notification_email_from ceshi@qq.com
smtp_server 127.0.0.1 
smtp_connect_timeout 30
router_id MASTER-HA
}      
vrrp_script chk_mysql_port {       #检测mysql服务是否在运行。用脚本检测等等script "/usr/mysql/chk_mysql.sh"   #这里通过脚本监测 interval 2                         #脚本执行间隔，每2s检测一次weight –5   #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5                    fall 2      #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）                     rise 1      #检测1次成功就算成功。但不修改优先级
}      
vrrp_instance VI_1 { state dataBase1               #这里所有节点都定义为dataBase1interface ens33               #指定虚拟ip的网卡接口mcast_src_ip 192.168.179.10   #本地IP virtual_router_id 51          #路由器标识，MASTER和BACKUP必须是一致的#定义优先级，数字越大，优先级越高同一个vrrp_instance，MASTER的优先级大于dataBase1的优先级。priority 101   advert_int 1nopreempt  #不抢占模式，在优先级高的机器上设置即可，优先级低的机器可不设置         authentication {   auth_type PASS auth_pass 123456     }virtual_ipaddress {    192.168.179.15   #虚拟IP }     
track_script {               chk_mysql_port             }
}

!Configuration File for keepalived       
global_defs {
notification_email {
ceshi@qq.com
}      
notification_email_from ceshi@qq.com
smtp_server 127.0.0.1 
smtp_connect_timeout 30
router_id MASTER-HA
}      
vrrp_script chk_mysql_port {script "/usr/mysql/chk_mysql.sh"interval 2            weight -5                 fall 2                 rise 1               
}       
vrrp_instance VI_1 {state   dataBase1interface    ens33 mcast_src_ip      192.168.179.12 virtual_router_id 51    priority 99          advert_int 1         authentication {   auth_type PASS auth_pass 123456     }virtual_ipaddress {    192.168.179.15    #虚拟IP }     
track_script {                chk_mysql_port             }
}