1. 第一步：下载MySQL的Yum Repository
    2.     wget -i -c http://dev.mysql.com/get/mysql57-community-release-el7-10.noarch.rpm
    4. 第二步：安装YumRepository
    5.     yum -y install mysql57-community-release-el7-10.noarch.rpm
    7. 第三步：安装MySQL
    8.     yum -y install mysql-community-server
    10. 第四步：启动MySQL服务
    11.     systemctl start  mysqld.service
    13. 第五步：获取MySQL密码
    14.     grep "password" /var/log/mysqld.log
    16. 第六步：更新MySQL登录密码
    17.     ALTER USER 'root'@'localhost' IDENTIFIED BY '';
    19. 第七步：设置密码的验证强度等级
    20.     set global validate_password_policy=LOW;
    22. 第八步：设置密码长度
    23.     set global validate_password_length=6;
    25. 第九步：重新设置MySQL密码
    26.     ALTER USER 'root'@'localhost' IDENTIFIED BY '123456'; 
    28. 第十步：设置MySQL远程访问
    29.     grant all privileges on *.* to 'root'@'%' identified by '123456' with grant option;
    30.   flush privileges; 
    32. 第十一步：防火墙添加MySQL端口
    33.     firewall-cmd --zone=public --add-port=3306/tcp --permanent;
    34.   firewall-cmd --reload
    36. 第十二步：设置数据库字符编码(vim /etc/my.cnf)
    37.     [client]
    38.     default-character-set=utf8
    39.     # For advice on how to change settings please see
    40.     # http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html
    43.   datadir=/var/lib/mysql
    44.     socket=/var/lib/mysql/mysql.sock
    45.     character-set-server=utf8
    46.     collation-server=utf8_general_ci
    48.     service mysqld restart
    49.     status