Hi
Information on
ovirt.org is about old node, from oVirt 4.0 we have NextGeneration Node (NGN). I don't use cobbler, but for PXE I can provide what worked for me.
pxelinux.cfg/ovirt-node.menu:
...
LABEL ovirt NGN
ipappend 2
Kickstart file to automate a lot of tasks for me "my.ks":
install
lang en_US.UTF-8
keyboard us
rootpw --plaintext 123
network --bootproto=dhcp
timezone --utc Europe/Prague
firewall --service=ssh
liveimg --url=http://websrv/your_unpacked_iso/ovirt-node-ng-image.squashfs.img
# partitioning - nuke and start fresh
zerombr
clearpart --all --initlabel
autopart --type=thinp
bootloader --location=mbr
reboot
%post --erroronfail
imgbase layout --init
%end
Basically liveimg --url ... & autopart & %post part should be enough for interactive install.
I hope I made it at least a little bit clearer.