Step by step guide for Resetig the mysql database root password in Linux

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Mysql installation time, If you have never set a root password for MySQL, the server does not require a password at all for connecting as root. To setup root password for first time, use mysqladmin command at shell prompt as follows:

Step1

$mysqladmin -u root password NEWPASSWORD

However, if you want to change (or update) a root password, then you need to use following command

Step2

$ mysqladmin -u root -p 'oldpassword' password newpass

For example, If old password is computer, and set new password to computerforum, then press enter

$ mysqladmin -u root -p 'computer' password 'computerforum'

Other then the ways specified here to reset and change the root password for mySQL in the case that the password is forgotten or lost.

Step3

1)Stop the mysql demon process using this command

sudo /etc/init.d/mysql stop
2)Start the mysqld demon process using the –skip-grant-tables option with this command

sudo /usr/sbin/mysqld –skip-grant-tables –skip-networking &

3)start the mysql client process using this command

mysql -u root

from the mysql prompt execute this command to reset/update your password
SET PASSWORD FOR root@’localhost’ = PASSWORD(‘password’);

If you have a mysql root account that can connect from everywhere, you should also do:
UPDATE mysql.user SET Password=PASSWORD(‘newpwd’) WHERE User=’root’;
Alternate Method:
USE mysql
UPDATE user SET Password = PASSWORD(‘newpwd’)
WHERE Host = ‘localhost’ AND User = ‘root’;
And if you have a root account that can access from everywhere:
USE mysql
UPDATE user SET Password = PASSWORD(‘newpwd’)
WHERE Host = ‘%’ AND User = ‘root’;

For either method, once have received a message indicating a successful query (one or more rows affected), flush privileges:
FLUSH PRIVILEGES;
exit

Then stop the mysqld process
sudo /etc/init.d/mysql stop
sudo /etc/init.d/mysql start