MySQL forget the super administrator password

--skip-grant-tables: skip authorization table
--skip-networking: Skip TCP / IP connection

Close the database

service mysqld stop

Use Safe Mode Boot

mysqld_safe --skip-grant-tables --skip-networking &
Or: An unexpected discovery
service mysqld restart --skip-grant-tables --skip-networking 

Log in and change your password database

[root@db01 ~]# mysql
mysql> alter user root@'localhost' identified by '123';
ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement
MySQL >  
MySQL > the flush privileges; manual loading authorization table #
mysql> alter user root@'localhost' identified by '123';

Restart the database to normal mode

[root@db01 ~]# service mysqld restart
Shutting down MySQL.. SUCCESS! 
Starting MySQL. SUCCESS!