TBH I don't know much about eJabberd and have no idea about using/configuring eJabberd with MySQL...
FWIW though TurnKey appliances are built on Debian (v13 = Debian Wheezy) and the eJabberd appliance uses the eJabberd package straight from the Debian repos. So armed with that info you will hopefully find some info about it via google...
No the appliance doesn't include MySQL
TBH I don't know much about eJabberd and have no idea about using/configuring eJabberd with MySQL...
FWIW though TurnKey appliances are built on Debian (v13 = Debian Wheezy) and the eJabberd appliance uses the eJabberd package straight from the Debian repos. So armed with that info you will hopefully find some info about it via google...
If you find info of value, please post back.