安装MySQL5.7版本

#安装wget工具

yum -y install wget

#下载MySQL安装源

wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm

#安装mysql源

yum -y install mysql57-community-release-el7-11.noarch.rpm

#安装MySQL

yum -y install mysql-community-server --nogpgcheck（不需要公钥验证）

#或者安装导入密钥

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

#启动数据库

systemctl  start mysqld

#查看MySQL生成的临时密码并进行登录

cat  /var/log/mysqld.log | grep password

#修改MySQL密码

#更新密码策略

mysql> set global validate_password_policy=low;
Query OK, 0 rows affected (0.00 sec)

mysql> set global validate_password_length=6;
Query OK, 0 rows affected (0.00 sec)

#修改root密码

mysql> set  password for 'root'@'localhost' = password('123456');
Query OK, 0 rows affected, 1 warning (0.00 sec)