How to upgrade MySQL 5.0 to MySQL 5.1 in a cPanel server

A similar request came to us two years back when we had to upgrade MySQL version 4.0 to MySQL 5.0. We are listing here the same approach for the current needs of upgrading MySQL 5.0 to 5.1

File responsible for the MySQL version is /var/cpanel/cpanel.config

Open it, find the variable mysql-version and edit the value to read mysql-version=5.1

And finally run

#  /scripts/mysqlup

This should upgrade your MySQL version to MySQL 5.1. For better understanding of the process behind, /scripts/mysqlup, go through the code and browse the URL http://httpupdate.cpanel.net/mysqlinstall/