Change/Reset mysql root password on Centos7

That will be very useful when you lost mysql root password

1. Stop mysql:

sudo systemctl stop mysqld

2. Set the mySQL environment option

sudo systemctl set-environment MYSQLD_OPTS="--skip-grant-tables"

3. Start mysql usig the options you just set

sudo systemctl start mysqld

4. Login as root

mysql -u root

5. Update the root user password with these mysql commands

mysql> UPDATE mysql.user SET authentication_string = PASSWORD('MyNewPassword') WHERE User = 'root' AND Host = 'localhost';
mysql> FLUSH PRIVILEGES;
mysql> quit

Update

For version 5.7.6 and later, you should use

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';

Or you'll get a warning

6. Stop mysql

systemctl stop mysqld

7. Unset the mySQL envitroment option so it starts normally next time

systemctl unset-environment MYSQLD_OPTS

8. Start mysql normally:

systemctl start mysqld

Try to login using your new password:

mysql -u root -p

Source: https://stackoverflow.com/questions/33510184/change-mysql-root-password-on-centos7