在虚拟机中进入mysql
mysql> GRANT ALL PRIVILEGES ON *.* TO ‘root‘@‘%‘ IDENTIFIED BY ‘123456‘ WITH GRANT OPTION;
Query OK, 0 rows affected (0.11 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.04 sec)
不需要重启，再试一次就OK了。。。
原文：http://www.cnblogs.com/sweet521/p/6061499.html