CentOS 6 minimal install, Spacewalk kickstart

At first uncheck "Don't install @Base package group" option!

Enter package list:

@core --nodefaults
-iwl*firmware
-ivtv*
-kexec-tools
-aic94xx-firmware*
-libertas*
-cronie-anacron
-cronie
-crontabs
-plymouth*
-postfix