How to rebuild the kernel for the network install

[Joshua C.]

2011/9/30 David Lehman <dlehman at redhat.com>:
> On Wed, 2011-09-28 at 10:57 +0200, Joshua C. wrote:
>> As the title says, I'd like to reinstall fedora 15 with the netinstall
>> image because it's about 100mb (kernel and initrd) instead of the
>> install dvds. My problem is that those files located in
>> http://download.fedora.redhat.com/pub/fedora/linux/releases/15/Fedora/x86_64/os/isolinux/
>> have long been outdated. As you can see the kernel is only 3.7mb and
>> the initrd almost 94mb. How to rebuild them from the latest
>> kernel-2.6.40.4-6.fc15?
>
> Does your hardware require the newer kernel? If not, just do the install
> with the provided media and then run 'yum update' once you've booted
> into your new system. No need to respin install media.
>
> Dave
>
>>
>> --joshua
>
>
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It's a p67 chipset and I'd like to rebuild the install media. I tried
dracut initrd.img `uname -r` but it produced a 26mb image. This falls
far behind the almost 100mb in the original install media. What did I
miss?

How to really rebuild it?