killall -9 mysqld
或者 /etc/inint.d/mysqld stop
usr/local/mysql/bin/mysqld_safe --skip-grant-table&
/usr/local/mysql/bin/mysql -u root
use mysql
UPDATE user SET password=password('ABC') WHERE user='root';
FLUSH PRIVILEGES;
service mysqld restart
如果还有其它用户能登录，可以执行
use mysql
UPDATE user SET password=password('ABC') WHERE user='root';
然后重启mysql即可
