service mysqld stop
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit
service mysqld start
mysql -uroot -p
mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit
service mysqld start
mysql -uroot -p