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新建执行脚本：mysql_install.sh，并添加执行权限

#!/bin/bash

#zhouyihua V0.1 2021.07.08

#For centos 7.0 & 8.0

#v 0.2

# add DNS

echo "----------  Add DNS  --------"

echo "nameserver 8.8.8.8" >> /etc/resolv.conf

#stop firewall

systemctl stop firewalld

if [ $? -ne 0 ]; then

    echo "Firewall stop failed"

else

    echo "Firewall stop success"

fi

#download mysql yum source

wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm

#install mysql yum source

rpm -ivh mysql80-community-release-el7-3.noarch.rpm

#enable 5.7

#sed -i '21s/enabled=0/enabled=1/g' /etc/yum.repos.d/mysql-community.repo

#sed -i '21s/enabled=0/enabled=1/g' /etc/yum.repos.d/mysql-community.repo

#disable 8.0

#sed -i '28s/enabled=1/enabled=0/g' /etc/yum.repos.d/mysql-community.repo

#install mysql

yum -y module disable mysql

yum -y remove mariadb-libs

yum install -y mysql-community-server

#config mysql

echo "-----------  Config my.cnf  ----------"

sed -i '/\[mysqld\]/a\lower_case_table_names=1' /etc/my.cnf

sed -i '/\[mysqld\]/a\skip-grant-tables' /etc/my.cnf

#start mysql

echo "----------  Starting mysql service  ----------"

systemctl start mysqld.service

mysql -uroot -p123456  << EOF

    use mysql;

    update user set authentication_string='' where user='root' ;

    flush privileges;

    ALTER user 'root'@'localhost' IDENTIFIED BY '?CZJh8JWxvH'；

EOF

echo "----------  Annotation skip grant tables in my.cnf    ----------"

sed -i 's/skip-grant-tables/\#skip-grant-tables/g' /etc/my.cnf

echo "----------  Restart mysql service  ----------"

systemctl restart mysqld.service

echo "----------  Grant all privileges  ----------"

mysql -uroot -p'Oracle1234!@#$'    --connect-expired-password -e "alter user 'root'@'localhost' identified by 'Oracle1234!@#$';"

mysql -u root -p'Oracle1234!@#$'  << EOF

    use mysql;

    CREATE USER 'maxkey'@'%' IDENTIFIED BY 'Oracle1234!@#$';

    GRANT ALL ON *.* TO 'maxkey'@'%';

EOF

参考：

先设置grant_skip_tables

  1.  use mysql

  2. update user set authentication_string='' where user='root' ;    如果这个字段有值，先置为空

  3. flush privileges    刷新权限表

  4.ALTER user 'root'@'localhost' IDENTIFIED BY 'Tianya1234'    修改root 密码

参考：https://blog.csdn.net/qq_27820551/article/details/101488430