CentOS 7 Minimal Kickstart

I have created CentOS 7 minimal install using this base channel:

http://mirror.centos.org/centos/7/os/x86_64/

And thes child channels:

http://mirror.centos.org/centos/7/updates/x86_64/
http://mirror.centos.org/centos/7/extras/x86_64/
https://copr-be.cloud.fedoraproject.org/archive/spacewalk/2.5-client/RHEL/7/x86_64/

Spacewalk child channel is needed to successfully work with kickstart function.

This is software list i write in package groups section:

@core --nodefaults
-aic94xx-firmware*
-alsa-*
-biosdevname
-btrfs-progs*
-dracut-network
-iprutils
-ivtv*
-iwl*firmware
-libertas*
-cronie-anacron
-cronie
-crontabs
-kexec-tools
-NetworkManager*
-plymouth*
-postfix
net-tools

Few screenshots: