creating custom initrd

Mike Wright mike.wright at
Sat Nov 10 00:15:04 UTC 2007

John Summerfield wrote:
> Rick Stevens wrote:
>> On Fri, 2007-11-09 at 15:14 -0600, Aaron Konstam wrote:
>>> On Fri, 2007-11-09 at 17:33 +0100, info at
>>> wrote:
>>>> Is it possible to define which modules mkinitrd should add to the 
>>>> initrd?
>>>> I have a custom initrd, but after every kernel upgrade, it recreates 
>>>> the
>>>> initrd. When it does this,
>>>> I loose the extra module I need, so I end up recreating the initrd
>>>> myself again.
>>>> I know in Ubuntu and Debian there is a file somewhere in /etc/sysconfig
>>>> that defines the modules
>>>> to use when building the initrd. But I have yet to find this file in 
>>>> Fedora.
>>> The --with option in mkinitrd
>> mkinitrd will load any modules required to mount the root filesystem
>> (e.g. SCSI, ext3, network [if / is on an NFS volume], etc.)  If you need
>> additional modules, then "--with=name-of-module" is required.
> Some one has to remember what the extra modules are? It's difficult 
> enough for me, let alone any colleagues who might share the 
> responsibility, or my successor.
> The Nameless One's point (in part) is that in Debian. one adds those 
> names to a configuration file, and then
> 1. It's documented for said colleagues and successors
> 2. It happens every time in the future, nobody has to remember it.
> I think you can do something by adding a file to 
> /etc/sysconfig/mkinitrd/ where you set MODULES to the list of modules to 
> add,

Good catch, John!

I'm not certain why this file isn't created during the initial 
installation process but I think it should be.  That would transparently 
integrate it into the mkinitrd described in the man page.

I found these four are the overridable options described in the manpage.


Not sure where this one comes from (possibly the mkinitrd script itself) 
but looks like an opportunity to specify network device modules.


MIke Wright

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