1.关闭mysql
# service mysqld stop
2.屏蔽权限
# mysqld_safe --skip-grant-table
3.新开起一个终端输入
# mysql -u root mysql
mysql>
UPDATE user SET Password=PASSWORD('newpassword') where USER='root'
mysql> FLUSH PRIVILEGES;//记得要这句话，否则如果关闭先前的终端，又会出现原来的错误
mysql> \q