How to reset MySQL root Password on CentOs,Ubuntu, Redhat Enterprise linux.

You can recover MySQL database server password with following five easy steps.

Step # 1: Stop the MySQL server process.
Step # 2: Start the MySQL (mysqld) server/daemon process with the --skip-grant-tables option so that it will not prompt for password.
Step # 3: Connect to mysql server as the root user.
Step # 4: Setup new mysql root account password i.e. reset mysql password.
Step # 5: Exit and restart the MySQL server.
Here are commands you need to type for each step (login as the root user):

Step # 1 : Stop mysql service

# /etc/init.d/mysql stop

Step # 2: Start to MySQL server w/o password:

# mysqld_safe --skip-grant-tables &

Step # 3: Connect to mysql server using mysql client:

# mysql -u root

Step # 4: Setup new MySQL root user password

mysql> use mysql;
mysql> update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root';
mysql> flush privileges;
mysql> quit

Step # 5: Stop MySQL Server:

# /etc/init.d/mysql stop

Step # 6: Start MySQL server and test it

# /etc/init.d/mysql start
# mysql -u root -p