# /etc/init.d/mysql stop

# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

# mysql -u root mysql

mysql> update user set password=password("123456") where user="root";

mysql> flush privileges;

mysql> quit

# /etc/init.d/mysql restart

# mysql -uroot -p

enter password: <输入新设的密码newpassword>

mysql>