切換到root用戶，然后進入mysql 的bin目錄后，

root@cps-desktop:/usr/local/mysql/bin# /etc/init.d/mysql stop
root@cps-desktop:/usr/local/mysql/bin# ./mysqld_safe --user=mysql --skip-grant-tables --skip-networking&
root@cps-desktop:/usr/local/mysql/bin# ./mysql -u root mysql
mysql> UPDATE user SET Password=PASSWORD('newpassword') where USER='root';
mysql> FLUSH PRIVILEGES;
mysql> quit;

最后重啟數(shù)據(jù)庫：

root@cps-desktop:/usr/local/mysql/bin# /etc/init.d/mysql restart
root@cps-desktop:/usr/local/mysql/bin# mysql -u root -p
Enter password: <輸入新設的密碼newpassword>

這里要注意，mysql的bin目錄會不一樣，我的是在/usr/bin#