Re: [Xen-users] How to make an initrd for xen

[Shahzad Chohan <shahzad.chohan@xxxxxxxxx>]

Hi Mark,

Thanks for the reply.

I downloaded it. I guess I need to compile it. Is there any simple
document available that describes how to compile and install this?

I don't mind using the 2.06 version. Is there a way to get this
working under FC4?

Many Thanks
Shaz

On 7/1/05, Mark Williamson <mark.williamson@xxxxxxxxxxxx> wrote:
> > I've started from scratch again, cos I got fustrated with it.
> > Basically I'm now trying to run the 2.4 kernel on FC4. I got the
> > kernel from the xen site i.e 2.06. the problem is that it won't boot.
> > It keeps crashing saying something like
> 
> Xen 2.0 is one compatibility series, Xen 3.0 is another.  FC4's Xen (and Xen
> tools) is part of the 3.0 series, so you can't run a Xen 2.0 guest kernel on
> it.
> 
> What you need is to grab the Xen source code for a Xen 3.0 2.4 guest kernel.
> Try downloading the unstable binary tarball, boot 2.4 and see if that works.
> 
> Cheers,
> Mark
> 
> > "Xen will only boot images made for xen 3.0"
> >
> > Here's what I did
> >
> > Currently I am running fedora core 4 with kernel 2.6.11-1.1369_FC4xen0
> >
> > mkinitrd /boot/initrd-2.4.30_xen0.img 2.4.30-xen0
> >
> > I then added this to /etc/grub.conf
> > title Xen  (2.4.30-xenU)
> >         root (hd0,0)
> >         kernel /xen.gz dom0_mem=150000
> >         module /vmlinuz-2.4-xen0 ro root=LABEL=/
> >         module /initrd-2.4.30_xen0.img
> >
> > and then reboot.
> >
> > Any idea where the problem is?
> >
> > Thanks
> > Shaz
> >
> > On 7/1/05, John Fairbairn <webmaster@xxxxxxxxxxxx> wrote:
> > > Just a thought,
> > >
> > > did you make sure to add an extra module line to your grub.conf...
> > > example dom0 booting from initrd....
> > >
> > > title Xen 2.0 / XenLinux 2.6.11-7
> > >         kernel /boot/xen.gz dom0_mem=256000 console=vga
> > >         module /boot/vmlinuz-2.6.11-xen0 root=/dev/hda2 ro console=tty0
> > >         module /boot/initrd-2.6.11-xen0.img
> > >
> > > without the last module line it wont work :)
> > >
> > > Hope this helps ya.
> > > John Fairbairn
> > >
> > > > Many Thanks for all your replies.
> > > >
> > > > I did this but it sill doesn't boot up rhel 3. I'm kind of new to this
> > > > initrd area, I thin the issue relates to FC4 running a 2.6 kernel
> > > > while rhel 3 runs a 2.4 kerenl. Am I right?
> > > >
> > > > If this is the case how can I make an initrd for the 2.4 kernel from
> > > > FC4.
> > > >
> > > > Many Thanks
> > > > Shaz
> > > >
> > > > On 6/30/05, Jon Howse <jonny.fahrenheit451@xxxxxxxxxx> wrote:
> > > >> You need the xenU kernel installed as well as the xen0 kernel and then
> > > >> you need to do:-
> > > >>
> > > >> touch /lib/modules/2.6.11-1.1369_FC4xenU/modules.dep
> > > >> This creates a file called modules.dep in specified directory.
> > > >> mkinitrd will complain if this file does not exist!
> > > >>
> > > >> then:-
> > > >>
> > > >> /sbin/mkinitrd /boot/initrd-2.6.11-1.1369xenU.img
> > > >> 2.6.11-1.1369_FC4xenU
> > > >>
> > > >> The filename you specify for the initrd can be anything but notice
> > > >> I've specified it to be in the /boot directory and descriptive of the
> > > >> kernel version.
> > > >>
> > > >> The last argument is the kernel version you want to make an initrd
> > > >> from. We want this to be the kernel we will be using in our guest
> > > >> domain(your EL3 machine).
> > > >>
> > > >> This will create an initrd that you can specify in your domain config
> > > >> file for your EL3 virtual machine.
> > > >>
> > > >> I have done this many times under Fedora, you should have no problems
> > > >> with this technique.
> > > >>
> > > >> Jonny
> > > >>
> > > >>
> > > >> _______________________________________________
> > > >> Xen-users mailing list
> > > >> Xen-users@xxxxxxxxxxxxxxxxxxx
> > > >> http://lists.xensource.com/xen-users
> > > >
> > > > _______________________________________________
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> > > > Xen-users@xxxxxxxxxxxxxxxxxxx
> > > > http://lists.xensource.com/xen-users
> > >
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> >
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>

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