dracut modules

dracut modules

[Dave Stone]

Hi everyone.  Are there any documents describing how to add new modules 
to /usr/share/dracut/modules.d?  I have looked at what is available with RHEL6 
Beta 1 version.  I would need to insert my own drivers before lvm.
Thanks in advance for your help.

-Dave

Re: dracut modules

[Amadeusz Żołnowski]

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Dave Stone <fsck1234-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>:
> Hi everyone.  Are there any documents describing how to add new
> modules to /usr/share/dracut/modules.d?  I have looked at what is
> available with RHEL6 Beta 1 version.  I would need to insert my own
> drivers before lvm. Thanks in advance for your help.  

Yes, there's README.modules in the root of sources directory [0]
(or inside /usr/share/doc/dracut-$version$ if your package manger puts
docs there). Functions like inst are well documented in comments in
dracut-functions script which should be placed in /usr/share/dracut/.

[0] http://sourceforge.net/projects/dracut/


Cheers,
Amadeusz Żołnowski

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Re: dracut modules

[Harald Hoyer]

On 06/24/2010 02:38 PM, Dave Stone wrote:
> Hi everyone.  Are there any documents describing how to add new modules
> to /usr/share/dracut/modules.d?  I have looked at what is available with RHEL6
> Beta 1 version.  I would need to insert my own drivers before lvm.
> Thanks in advance for your help.
>
> -Dave
>

own drivers == kernel driver modules?

/etc/dracut.conf:

# additional kernel modules to the default
#add_drivers+=""

or put it in /etc/dracut.conf.d/mykernelmodules.conf
add_drivers+=" mykernelmodule "


or put it on the kernel command line (see man dracut):

rdloaddriver=<drivername>
      force loading kernel module <drivername> This parameter can be specified 
multiple times.

Re: dracut modules

[Dave Stone]

Harald Hoyer <harald@...> writes:

> 
> On 06/24/2010 02:38 PM, Dave Stone wrote:
> > Hi everyone.  Are there any documents describing how to add new modules
> > to /usr/share/dracut/modules.d?  I have looked at what is available with 
RHEL6
> > Beta 1 version.  I would need to insert my own drivers before lvm.
> > Thanks in advance for your help.
> >
> > -Dave
> >
> 
> own drivers == kernel driver modules?
> 
> /etc/dracut.conf:
> 
> # additional kernel modules to the default
> #add_drivers+=""
> 
> or put it in /etc/dracut.conf.d/mykernelmodules.conf
> add_drivers+=" mykernelmodule "
> 
> or put it on the kernel command line (see man dracut):
> 
> rdloaddriver=<drivername>
>       force loading kernel module <drivername> This parameter can be 
specified 
> multiple times.
> 

Thanks for the responses guys.  I have read the REDAME file and other related 
docs.  I think my first inquiry was not sufficient so I'll try to explain a 
little better.

What I'm trying to do is to insert a third party multi-pathing package before 
root "/" is mounted.  This needs to be done in BFS(boot from SAN) 
environment.  The equivalent of this with SLES11 was to write 71-setup-MP.sh 
and 21-boot-MP.sh scripts.  Then use mkinitrd with -f to add this new feature 
to the initrd image.  I need to simulate the same setup and boot scripts to do 
the same thing for RHEL6.

I assume this is possible with dracut.  I also think I need to use pre-mount 
hook to do this.  I'm still not sure of what I should use for two digit 
numeric code.

One other question when using rdloaddriver=<drivername> at what stage of boot 
process does this driver gets loaded?  

Regards,
-Dave

Re: dracut modules

[Harald Hoyer]

On 06/25/2010 03:53 PM, Dave Stone wrote:
> One other question when using rdloaddriver=<drivername>  at what stage of boot
> process does this driver gets loaded?

In the beginning, before udev is started.

>
> Regards,
> -Dave
>