How do I make an installation initrd.img for a new kernel?

[Jay Cliburn]

Jay Cliburn wrote:
> Barry Scott wrote:
>> I need up update the network install for FC4 so that it
>> supports new hardware (nVidia ethernet - forcedeth).
>>
>> The 2.6.17 kernel is fine in this case. But the initrd.gz that
>> is installed in /boot is nothing like the images/pxeboot/initrd.img
>> from the installation CD.
>>
>> I need to know how the images/pxeboot/initrd.img  was made
>> so that I can make a new one for the 2.6.17 kernel.
>>
>> Can anyone point in the right direction?
> 
> Don't know about the pxeboot initrd, but to roll your own initrd, first 
> make sure you have a kernel/initrd combination that allows you to boot 
> into the machine in case the following causes problems.
> 
> Then save the existing initrd, and
> 
> mkinitrd -f --preload=module1 --preload=module2 --preload=moduleN \
> initrd-<kernelversion>.img <kernelversion>
> 
> where <kernelversion> = `uname -r`

I realized after hitting send that my final "where..." statement could be 
misleading.  <kernelversion> should be what `uname -r` would return on the 
target OS version, not necessarily the version you're running at the time you 
issue mkinitrd.