while  true

#!/bin/bash
while  true
do
let c++
echo $c
ip1=1.1.1.1

ip2=1.1.1.2

ip3=1.1.1.3
vip=1.1.1.77
a=`ip a | grep -oP  '(\d{1,3}\.){3}\d{1,3}' | awk -F "." '{print $4}' | tr '\n' ' ' `
for var in ${a[@]}
        do
                if [ $var -eq 77 ];then
                if [ $c -eq 2 ];then
                echo  "The machine is now mysql main write server"
                a1=`mysql -ud -pd -h $vip -e "show master  status" | sed -n '/mysql/p'|awk '{print $1}'`
                a2=`mysql -ud -pd -h $vip -e "show master  status" | sed -n '/mysql/p'|awk '{print $2}'`
                echo $a1 $a2
                for i in $ip1 $ip2 $ip3
                do
                mysql -ud -pd -h$i -e "slave stop; change master to master_host='$vip',master_user='d',master_password='d', master_log_file='$a1',master_log_pos=$a2; slave start;"
                done
                fi
                else
                cc=`echo $a  |  awk '/77/{print "yes"}' `
                if [ "$cc" != "yes" ] ;then
                c=0
                echo "Native backup machine"   
                fi
                fi
done
sleep 3
done