下载mysql5.7 wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.37-1.el7.x86_64.rpm-bundle.tar 也可直接下载到本地，再进行安装。二、解压
tar -xvf mysql-5.7.37-1.el7.x86_64.rpm-bundle.tar
解压后得到11个文件。
四、编辑配置文件yum install mysql-community-{libs,client,common,server}-*.rpm
五、查看安装是否成功vim /etc/my.cnf文件，末尾添加一行–>character-set-server=utf8
六、启动 MySQL 服务mysql -V
mysql Ver 14.14 Distrib 5.7.37, for Linux (x86_64) using EditLine wrapper
七、设置 MySQL 服务开机自启动systemctl start mysqld
八、查看root用户的初始密码systemctl enable mysqld
九、登录MySQL , 设置新密码(初始密码)grep ‘temporary password’ /var/log/mysqld.log
十、设置密码策略mysql -u root -p
十一、设置新密码set global validate_password_policy=0;
set global validate_password_length=4;
十二、授权root远程登录ALTER USER ‘root’@‘localhost’ IDENTIFIED BY ‘新密码’;
设置完成后退出 exit, 重新登录 mysql -u root -p
十三、执行生效命令(这一步一定要做, 不然无法成功)GRANT ALL PRIVILEGES ON . TO ‘root’@‘%’ IDENTIFIED BY ‘新密码’ WITH GRANT OPTION;
flush privileges;
