RE: [Xen-users] probs running stuff from initrd

[xen@xxxxxxxxxx]

On Mon, 3 Apr 2006, Petersson, Mats wrote:

> > -----Original Message-----
> >
> > Hello all
> >
> > Now I may be way of whack here, so please forgive me.
> >
> > I'm trying to merge xen with redhat's config-netboot. The
> > idea being a kinda stateless domU. For those that haven't
> > seen you share a rootfs and then bind mount all the
> > individual files over then top, and the redhat gui builds all
> > the pxeboot config and stuff for you if you want a diskless
> > client. I thought this would be nice for our domU's but
> > obviously don't need the pxe bit.
> >
> > I've got nfsroot domU's working, and was just wondering if it
> > would be possible to mount the diskless initrd and run the
> > diskless script from inside that.
> >
> > First of all what do you think root should equal. For nfsroot
> > you set it to /dev/nfs but the pxeconfig that get produced
> > uses /dev/ram0
> >
> > I've also set this
> >
> > ramdisk = "/tftpboot/linux-install/RHEL4.1/initrd.img"
> >
> > and then tried to pass init=disklessrc
> >
> > But it does this ( with root= /dev/ram0 ):-
> >
> > RAMDISK: ext2 filesystem found at block 0
> > RAMDISK: Loading 5000KiB [1 disk] into ram disk... done.
> > VFS: Mounted root (ext2 filesystem).
> > Freeing unused kernel memory: 184k freed
> > Warning: unable to open an initial console.
> > Kernel panic - not syncing: No init found.  Try passing init=
> > option to kernel.
> >
> > Now that initrd has got a console (and a null) and I've tried
> > passing various init= lines but nothing works. I've also
> > tried rebuilding the initrd with links to init and linuxrc,
> > but nothing.
> >
> > What would I need to pass as a root= to be able to get it to
> > run something in the initrd?
> The problem isn't with trying to run something in initrd [at least not
> directly], but most likely failing when the system tries to mount your
> "root" directory (/).
>
> It's either missing the /dev/<something> that you've said is "/", or
> it's missing some driver needed to access this.
>
> I've seen this a fair number of times (both on my own system, due to
> missing /dev/something or due to missing driver) and people on this list
> suffering the same thing.
>
> You may need to compile more stuff into your XenU kernel to make it work
> right...
I can't think what else I'd need. All the rootnfs stuff is ok. I've 
checked all the initrd and ramdisk stuff and its all in. I've also 
copied in the /dev from the working root image into the initrd, but 
still no joy.
Cheers
Lee



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