I’ve talked in the past about Yum repositories, and how you can create them. If you are using kickstart and want to import the contents of a CD for use by the installer, there are numerous ways you can tackle this issue. One of the easiest methods is to loopback mount the CDs or DVDs and copy them to your kickstart directory hierarchy:
$ mount -o loop CentOS-6.0-x86_64-bin-DVD1.iso /cd1
$ mount -o loop CentOS-6.0-x86_64-bin-DVD2.iso /cd2
$ cd /cd1 && cp -rp repodata /kickstart/centos/6/x86_64/os &
$ cd /cd1 && cp -rp images /kickstart/centos/6/x86_64/os &
$ cd /cd1 && cp -rp Packages /kickstart/centos/6/x86_64/os &
$ cd /cd2 && cp -rp Packages /kickstart/centos/6/x86_64/os &
You will need to make sure to copy the Packages, repodata and images directories. After the copy completes you can point your kickstart.cfg file at the top level directory of the release you want to install:
url --url=http://kickstart.prefetch.net/kickstart/centos/6.0/x86_64/os/
Posting here so I have this procedure for future reference.