[CentOS-devel] how does the minimal and netinstall ISO install media created

hi guys. I want to create a cutomed centos 6.5 LiveOS (adding some sysadimn
tools),
which could boot from PXE.

I want to consult CentOS-6.5-x86_64-minimal.iso or
CentOS-6.5-x86_64-minimal.iso , but I can NOT find how does it created.

I have find a ks.cfg from:

https://projects.centos.org/trac/livecd/browser/trunk/CentOS6/rhel6beta-livecd-minimal.ks

but it was 4 years ago, it too old.

thanks.
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