考虑到这种情况，我这里还是用的master-slave（主从）架构。 keepalive安装很简单，这里不再啰嗦。主要看下配置文件和脚本：
# more /etc/keepalived/keepalived.conf
global_defs {
router_id KeepAlive_Mysql
}
vrrp_script check_run {
script "/root/sh/mysql_check.sh"
interval 300
}
vrrp_sync_group VG1 {
group {
VI_1
}
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 100
advert_int 1
nopreempt
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
check_run
}
notify_master /root/sh/master.sh
notify_backup /root/sh/backup.sh
notify_stop /root/sh/stop.sh
virtual_ipaddress {
192.168.8.150
}
}
notify_master <STRING>|<QUOTED-STRING> # 状态改变为MASTER后执行的脚本 notify_backup <STRING>|<QUOTED-STRING> # 状态改变为BACKUP后执行的脚本 notify_fault <STRING>|<QUOTED-STRING> # 状态改变为FAULT后执行的脚本 notify_stop <STRING>|<QUOTED-STRING> # VRRP停止后后执行的脚本 notify <STRING>|<QUOTED-STRING> # (1)任意状态改变后执行的脚本 下面解释下这4个脚本的用法： mysql_check.sh（健康检查脚本，当发现mysql连接不上，会把keepalive进程关闭，并切换。）
# more mysql_check.sh
#!/bin/bash
. /root/.bash_profile
count=1
while true
do
mysql -e "show status;" > /dev/null 2>&1
i=$?
ps aux | grep mysqld | grep -v grep > /dev/null 2>&1
j=$?
if [ $i = 0 ] && [ $j = 0 ]
then
exit 0
else
if [ $i = 1 ] && [ $j = 0 ]
then
exit 0
else
if [ $count -gt 5 ]
then
break
fi
let count++
continue
fi
fi
done
/etc/init.d/keepalived stop
master.sh（状态改变为MASTER后执行的脚本） （首先判断同步复制是否执行完毕，如果未执行完毕，等1分钟后，不论是否执行完毕，都跳过，并停止同步复制进程。） （其次，更改前端程序连接的业务账号admin的权限和密码，并记录当前切换以后的日志和POS点。）
# more master.sh
#!/bin/bash
. /root/.bash_profile
Master_Log_File=$(mysql -e "show slave status\G" | grep -w Master_Log_File | awk -F": " '{print $2}')
Relay_Master_Log_File=$(mysql -e "show slave status\G" | grep -w Relay_Master_Log_File | awk -F": " '{print $2}')
Read_Master_Log_Pos=$(mysql -e "show slave status\G" | grep -w Read_Master_Log_Pos | awk -F": " '{print $2}')
Exec_Master_Log_Pos=$(mysql -e "show slave status\G" | grep -w Exec_Master_Log_Pos | awk -F": " '{print $2}')
i=1
while true
do
if [ $Master_Log_File = $Relay_Master_Log_File ] && [ $Read_Master_Log_Pos -eq $Exec_Master_Log_Pos ]
then
echo "ok"
break
else
sleep 1
if [ $i -gt 60 ]
then
break
fi
continue
let i++
fi
done
mysql -e "stop slave;"
mysql -e "flush logs;GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY 'admin';flush privileges;"
mysql -e "show master status;" > /tmp/master_status_$(date "+%y%m%d-%H%M").txt
backup.sh（状态改变为BACKUP后执行的脚本） # more backup.sh #!/bin/bash . /root/.bash_profile mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '1q2w3e4r';flush privileges;" stop.sh（keepalived停止后后执行的脚本） （首先把admin密码更改掉） （其次，设置参数，保证不丢失数据） （最后，查看是否还有写操作，不论是否执行完毕，1分钟后都退出。）
# more stop.sh
#!/bin/bash
. /root/.bash_profile
mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'admin'@'%' IDENTIFIED BY '1q2w3e4r';flush privileges;"
mysql -e "set global innodb_support_xa=1;"
mysql -e "set global sync_binlog=1;"
mysql -e "set global innodb_flush_log_at_trx_commit=1;"
M_File1=$(mysql -e "show master status\G" | awk -F': ' '/File/{print $2}')
M_Position1=$(mysql -e "show master status\G" | awk -F': ' '/Position/{print $2}')
sleep 1
M_File2=$(mysql -e "show master status\G" | awk -F': ' '/File/{print $2}')
M_Position2=$(mysql -e "show master status\G" | awk -F': ' '/Position/{print $2}')
i=1
while true
do
if [ $M_File1 = $M_File2 ] && [ $M_Position1 -eq $M_Position2 ]
then
echo "ok"
break
else
sleep 1
if [ $i -gt 60 ]
then
break
fi
continue
let i++
fi
done
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