MySQL安装

下载对应版本的rpm
wget https://dev.mysql.com/get/mysql57-community-release-el7-9.noarch.rpm
安装对应rpm包
rpm -ivh mysql57-community-release-el7-9.noarch.rpm
跳转到/etc/yum.repos.d/,执行yum install mysql-server
删除以前的配置rm -rf /var/lib/mysql
启动systemctl start mysqld
获取临时密码grep 'temporary password' /var/log/mysqld.log
登录
查看密码策略SHOW VARIABLES LIKE 'validate_password%';
修改密码策略set global validate_password.policy=LOW; set global validate_password.length=6;
修改密码ALTER USER 'root'@'localhost' IDENTIFIED BY '123456';