MySQL主从 ---bash脚本

mysql主从可以避免主机意外带来的损失,主库出现问题,可以快速切换到从库提供服务。
可以在从库上执行查询操作,从主库中更新。实现读写分离可以在从库中执行备份,以避免备份期间影响主库的服务。

主:

vim master.sh
#!/bin/bash
echo "此脚本用于搭建主从环境 (主)"
#检测是否安装MySQL

rpm -qa | grep mariadb-server &> /dev/null
if [ $? -eq 0 ];then
        echo "mysql 已经安装
else
        echo "未安装MySQL 开始安装MySQL…… "
        echo "请耐心等待"
        
yum -y install mariadb mariadb-server &> /dev/null
echo " mysql 安装成功"
fi

修改配置文件:

echo "正在修改mysql主的配置文件"
sed -i '/server/d' /etc/my.cnf
sed -i '/log-bin/d' /etc/my.cnf
sed -i '1a\log-bin=mysql-bin' /etc/my.cnf
sed -i '2a\server-id=1' /etc/my.conf
echo " 配置文件修改成功 ,正在启动MySQL……"
systemctl start mariadb &> /dev/null

登陆数据库授权用户

a = " grant all on *.* to axiba@'%' identified by '123'"
mysql -u root -e "${a}"
mysql -uroot -e 'show master status' | grep mysql| awk '{print $1}' &> /shell/mysqlzhu.log
mysql -uroot -e 'show master status' | grep mysql| awk '{print $2}' &>> /shell/mysqlzhu.log
echo " 授权成功!!!"
systemctl iptables stop
setenforce 0

从:

#!/bin/bash
file=`cat /shell/mysqlzhu.log |sed -n '1p'`
pid=`cat /shell/mysqlzhu.log|sed -n '2p'`
#mysql主从之从数据库操作
#安装mysql数据库服务
rpm -qa | grep mysql-server &>/dev/null
if [ $? -eq 0 ]
then
        echo "mysql已经成功安装"
else
        echo "mysql没有安装,现在开始安装mysql"
        yum -y install mariadb mariadb-server&>/dev/null
        echo "mysql安装完成"
fi

修改配置文件:

echo "##修改mysql从的配置文件中"
sed -i '/relay/d' /etc/my.cnf
sed -i '/server/d' /etc/my.cnf
sed -i '1a\relay-log=mysqlbin' /etc/my.cnf
sed -i '2a\server-id=2' /etc/my.cnf

启动

systemctl start mairiadb

授权

echo "###mysql从中在操作"
mysql -uroot -e "stop slave"
echo "主从开始同步!"
change="change master to master_user='axiba',master_host='10.30.36.22',master_password='123',master_log_file='"$file"',master_log_pos="$pid"" &>/dev/null
mysql -uroot -e "$axiba" &>/dev/null
echo "同步完成!!!"
mysql -uroot -e "start slave"
echo "开启同步成功!!!"
sleep 20
mysql -uroot -e "show slave status \G" | grep Yes|cut -d ":" -f2 > /shell/mysqlcong.log
echo  "测试是否成功,双yes则成功"
cat /shell/mysqlcong.log
yes=`cat /shell/mysqlcong.log`
b="Yes Yes"
user=" ****@qq.com"
sub="mysql主从"
con="主从失败!!!请及时解决"
conc="主从成功"
if [ "$yes"="$b" ]
then
 echo "mysql主从设置成功!!!"
 /shell/sendemail.sh "$user"  "$sub" "$conc" &>/dev/null 
else
 echo "mysql主从同步失败!!!"
 /shell/sendemail.sh "$user"  "$sub" "$con" &>/dev/null
fi

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