On Fri, May 14, 2010 at 07:47:33AM -0300, Net Warrior wrote:
> Hi There.
> The hardware is the same, so I asume that the initramfs used for Dom0
> could be used for DomU as well
>
No, the hardware is not the same!
domU only has "virtual" hardware provided by Xen, which is totally different
from the physical hardware dom0 has access to!
, and yes I specified the root partition in
> the DomU config file as well something like root /dev/sda1 ro , should I
> use xdev as well in there?
> Thanks for your time and support.
>
Please paste your /etc/xen/<guest> cfgfile.
-- Pasi
> Best Regards
> 2010/5/14 Pasi Kärkkäinen <[1]pasik@xxxxxx>
>
> On Thu, May 13, 2010 at 07:40:51PM -0300, Net Warrior wrote:
> > Hi there guys
> >
> > As a test, I started using the same kernel and initramfs like in Dom0
> > which i know it works, but when starting up DomU I've get.
> >
> > switchroot: mount failed: No such file or directory
> > Kernel panic - not syncing: Attempted to kill init!
> > Pid: 1, comm: init Not tainted 2.6.31.13 #14
> >
>
> So the dom0 initrd image is not suitable for domU, ie. it doesn't load
> xen block frontend driver.. most probably. So the domU kernel is
> not able to access the virtual disks provided to it.
> > I've got the same error while setting up Dom0 and was a problem with
> > the scsi modules which I included in the kernel and not in the
> > initramfs, my bad !!
> >
> > My config file looks this.
> >
>
> #----------------------------------------------------------------------------
> > # Kernel image file.
> > kernel = "/boot/vmlinuz-2.6.31.13"
> >
> > # Optional ramdisk.
> > ramdisk = "/boot/initrd-2.6.31.13.img"
> >
> > disk = [ 'phy:VG-NW/root,sda1,w','phy:VG-NW/swap,sda2,w' ]
> >
>
> You should use xvda1 and xvda2 here, not sda1 and sda2.
> the sd* naming is deprecated for xen PV guests.
> > Also copied the /lib/modules/kernel_version to the *guest* partition.
> >
> > What am I missing?
> >
>
> You need to create an initrd image that is suitable for the domU.
>
> Also did you specify root= parameter for the domU kernel?
> -- Pasi
>
> > Thanks for your time and support
> > Regards
> >
> >
> >
> >
> >
> >
> >
> >
> > 2010/5/13, Pasi Kärkkäinen <[2]pasik@xxxxxx>:
> > > On Thu, May 13, 2010 at 02:38:40PM -0300, Net Warrior wrote:
> > >> Hi Pasi.
> > >>
> > >> Did not know I could use the Vanila Kernel for DomU usage, I
> thought
> > >> it has to be patched somehow as well.. so good news, I'll try to
> > >> compile a custom one using the latest stable from [3]kernel.org and
> leave
> > >> the Dom0 which is working as it is.
> > >>
> > >
> > > I recommend using the latest stable 2.6.32.x kernel for the domU.
> > >
> > > If you're building a 32bit domU kernel remember it needs to be PAE
> (64G mem
> > > support),
> > > otherwise you won't see the pvops Xen domU options at all in the
> kernel
> > > configuration.
> > >
> > > There are no special requirements for 64bit domU kernel.
> > >
> > > -- Pasi
> > >
> > >> Thanks for your time and support
> > >> Regards
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> 2010/5/13, Pasi Kärkkäinen <[4]pasik@xxxxxx>:
> > >> > On Thu, May 13, 2010 at 12:38:00PM -0300, Net Warrior wrote:
> > >> >> Hi there guys.
> > >> >>
> > >> >> I'm using CentOS 5.4, I was able to compile my custom Dom0
> kernel
> > >> >> and
> > >> >> boot
> > >> >> it, now I've got some doubts.
> > >> >>
> > >> >> I'd like to compile a custom DomU image, the problem is that
> when I
> > >> >> do,
> > >> >> make kernels KERNELS="linux-2.6-xen0 linux-2.6-xenU" it tries
> to
> > >> >> download
> > >> >> the kernel
> > >> >> from the HG repository which seems to have old 2.6.18
> kernels, I
> > >> >> want
> > >> >> to
> > >> >> use the GIT repository which is alrealdy downloaded and is
> the
> > >> >> source I
> > >> >> used to complile Dom0 using
> > >> >> kernel 2.6.33.13.
> > >> >>
> > >> >
> > >> > specifying KERNELS="linux-2.6-xen0 linux-2.6-xenU" will compile
> > >> > linux-2.6.18-xen,
> > >> > that's how it should be.
> > >> >
> > >> > If you don't specify KERNELS= at all, then it'll build
> linux-2.6.31.x
> > >> > kernel.
> > >> > Or alternatively you can specify KERNELS="linux-2.6-pvops" to get
> the
> > >> > same
> > >> > result.
> > >> >
> > >> >> Question:
> > >> >> Which files do I have to modify or how do I have to proceed
> to
> > >> >> achieve
> > >> >> what I want?
> > >> >>
> > >> >
> > >> > Did you know you can use the *default* (vanilla) [5]kernel.org
> Linux
> > >> > kernels as
> > >> > Xen PV domU?
> > >> > No patches needed for that, the upstream kernels will work for
> domU.
> > >> >
> > >> >> Under /usr/src/xen-4.0.0/buildconfigs I can see some files
> which
> > >> >> define
> > >> >> some stuff depending on what I chose but not sure if it's
> safe to
> > >> >> mees
> > >> >> with this.
> > >> >>
> > >> >> Thanks for your time and support.
> > >> >
> > >> > Hopefully that helps.
> > >> >
> > >> > -- Pasi
> > >> >
> > >> >
> > >
>
> References
>
> Visible links
> 1. mailto:pasik@xxxxxx
> 2. mailto:pasik@xxxxxx
> 3. http://kernel.org/
> 4. mailto:pasik@xxxxxx
> 5. http://kernel.org/
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