环境拓扑

 

 

chengAlived

#!/bin/bashfunction checkModelone(){	echo "重新进行获取"	wget 192.168.158.147:3306 -O mysql	echo "获取成功"	echo "进行判断..."	grep "5.7.17" mysql > /dev/null	if [ $? -eq 0 ]; then	       	echo "mysql正在运行..."		echo "检查keepalived进程是否存在..."		ps aux|grep keepalived |grep -v grep		if [ $? -ne 0 ]		then			echo "keepalived进程丢失"			echo "准备重启keepalived..."			/usr/local/keepalived/sbin/keepalived -f /etc/keepalived/keepalived.conf                        echo "重启成功"		else			echo "keepalived 正在运行..." 		fi	else		echo "mysql端口异常..."		echo "准备杀除keepalived进程进行漂移"		chengkill keepalived		echo "漂移作业完毕"	fi}function checkModeltwo(){   checkModelone}while [ true ]; do	/bin/sleep 10	if [ -d "mysql" ];then		touch mysql	else		if [ -s ./mysql ]; then			echo "文件不为空"			checkModelone			du -sh mysql		else			echo "文件为空"			checkModeltwo		fi	fidone

运行规则:nohup ./chengAlived.sh &

说明+:

运行后, 会判断是否存在名字为"mysql"的文件, 否则新建, 把wget后的内容写进这个文件, 通过3306端口使用grep判断mysql版本号, 对keepalived漂移进行管理.

讲解+

第一台机器mysql主机+vip

第二台机器keepalived+lvs

启动脚本

nohup ./chengAlive.sh &

 进程

ps aux | grep chengAlive.sh [root@localhost test]# ps aux | grep chengAlive.sh root      16407  0.0  0.1 113128  1412 pts/1    S    15:27   0:00 /bin/bash ./chengAlive.shroot      16410  0.0  0.1 112676  1008 pts/1    R+   15:27   0:00 grep --color=auto chengAlive.sh

 日志(mysql处于正常开启状态)

模拟宕机

 假如mysql挂掉了(这是158.147)

然后keepalived查看脚本日志信息(158.149)

 

上面,,由于mysql已挂, kill掉keepalived, 实现漂移操作

抢占模拟

 如果mysql重新启动(158.147)

 

再看keepalive(158.149)脚本日志

重新自动启动keepalive.抢占成功.

完毕.