Hi I've just now installed a minimal installation but still there is a file 
called /etc/my.cnf

ls -l  /etc/my.cnf 
-rw-r--r--. 1 root root 251 20 jan 23.36 /etc/my.cnf

I have never installed mysql-server on this system.

cat /etc/issue
Scientific Linux release 6.0 (Carbon)
Kernel \r on an \m

Is it supposed to be there?

Best Regards
Stefan