Create a MySQL appliance

MySQL is a relational database management system (RDBMS) which has more than 11 million installations, and is owned by Sun Microsystems. MySQL is a fast, stable, robust, easy to use, and true multi-user, multi-threaded SQL database server.

It makes a lot of sense to segregate a database on a separate machine / appliance.
Separating different components into different machines makes it easier to monitor load and do resource re-allocation in a VM (e.g., increase memory, add CPU, etc.)

Notes:
* the database server will have to be accessible via TCP by default
* integrate phpMyAdmin for web based administration
* include webmin firewall module (configure who can access the system/database)