CentOS mysql 無法遠程連接3306端口

1.如果是阿里雲服務器，首先檢查安全組端口是否開放。
2.查看用戶權限

select user,host from mysql.user;

2.修改權限

    mysql -u root -p    //登錄MySQL 
    mysql> use mysql;
    mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;
    mysql> FLUSH PRIVILEGES;    //需要輸入此命令使修改生效
    mysql> EXIT    //退出