1. 进入mysql客户端
配置环境变量：mysql -u root -p
没配置环境变量：cd /usr/local/mysql/bin（MYSQL_HOME/bin)
./mysql -uroot -p
2. 进入mysql数据库
use mysql
3. 输入设置参数
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;
4. 设置立即生效
flush privileges;
5. 查看结果
select host,user from user;