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5.6 MySql主从自动切换脚本

发表于：2025-11-07 作者：千家信息网编辑

千家信息网最后更新 2025年11月07日，2015.07.17 #!/bin/bash cat << README #####################################################

千家信息网最后更新 2025年11月07日5.6 MySql主从自动切换脚本2015.07.17

#!/bin/bash
cat << README
#####################################################################################################
#Auther :zhanglin #
#Date : 2015.07.17 #
#Step 1: point the slave IP 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 #
#Step 2: check the master and slave information whether good for change　　　　　　　　　　　　　　#
#Step 3: stop old slave,then get new master binlog name and postation,then execute change master to #
#Step 4: start slave,and show whether change successed. #
#####################################################################################################
README
User=root
PW=123456
read -p "-- Please input the slave IP:" Slave
Master=$(mysql -u${User} -h${Slave} -p${PW} -e "show slave status \G;"|awk '/Master_Host/{print $2}')
if [ -n "${Master}" ]
then
echo -e "--Master IP:${Master},Slave IP:${Slave}"
M=$(mysql -u${User} -h${Master} -p${PW} -e "show master status;"|awk 'NR==2{print $2}')
S=$(mysql -u${User} -h${Slave} -p${PW} -e "show slave status \G;"|awk '/Read_Master_Log_Pos/{print $2}')
echo -e "-- master pos:${M};slave pos is:${S}"
else
echo "-- Slave IP input wrong,please input again ! "
exit 1
fi
if [ "${M}" -eq "${S}" ]
then
read -p "-- Master-Slave is accordance,input Yes to start changing:" var
case "$var" in
[Yy]es)
mysql -u${User} -h${Slave} -p${PW} -e "stop slave;reset slave;change master to master_host='';"
Pos=$(mysql -u${User} -h${Slave} -p${PW} -e "show master status;"|awk 'NR==2{print $2}')
File=$(mysql -u${User} -h${Slave} -p${PW} -e "show master status;"|awk 'NR==2{print $1}')
mysql -u${User} -h${Master} -p${PW} -e "stop slave;
change master to master_user='ideal',master_host='${Slave}',master_password='123456',master_log_file='${File}',master_log_pos=${Pos};
start slave;"
;;
*)
echo "-- error input .... exit!"
;;
esac
echo "-- changing, please wait 3s...."
sleep 3
echo "-- change successfull,the new master is:${Slave},new slave is ${Master}"
SlaveIOStatus=$(mysql -u${User} -h${Master} -p${PW} -e "show slave status \G;"|awk '/Slave_IO_Running/{print $2}')
SlaveSQLStatus=$(mysql -u${User} -h${Master} -p${PW} -e "show slave status \G;"|awk '/Slave_SQL_Running/{print $2}')
printf "The new master is: \n Slave_IO_Running=${SlaveIOStatus}\n"
printf "Slave_SQL_Running=${SlaveSQLStatus}\n"
else
echo "node change failed please change again ! "
exit 1
fi