It is not possible to recover a lost mysql password since they are encrypted. But it can always be changed or reset.
To change the root mysql password, follow these steps:
1) Stop mysql by executing as root in the command line: service mysql stop
2) Start mysql without the privileges system, execute: mysqld_safe --skip-grant-tables &
3) Open the mysql console by executing: mysql
4) Run the following queries (replace the root password with your desired password)
UPDATE mysql.user SET Password=PASSWORD('yourpassword') WHERE User='root';
FLUSH PRIVILEGES;
5) exit the mysql console and stop mysql: service mysql stop
6) Start mysql by executing: service mysql start
Now the new password is in place.
