Re: [Xen-users] grub entries for Dom0 kernel

[Tapas Mishra <tapas@xxxxxxxxxxxx>]

Ok thanks a lot for the reply I was thinking some thing else
after compiling the kernel for Dom0 I did not got a single error and
the same happened when i did an mkinitramfs for it
the trick was to use  a config file generated by the debian installation
all these steps are mentioned clearly in the blog
http://www.infohit.net/blog/post/compiling-a-xen-dom0-kernel-for-ubuntu-jaunty.html

but then I did install the hypervisior by the following command
aptitude install ubuntu-xen-desktop
now on the Xen wiki it has been mentioned
http://wiki.xensource.com/xenwiki/XenDom0Kernels
"You should always match Xen hypervisor and Xen dom0 kernel versions. "
Which I think might be a cause of error but then how to find out if it
is the mistake which I have been thinking for as grub entry problem

Since I compiled a Dom0 kernel from scratch using a vanilla kernel of
www.kernel.org
and applied patches to xenify it
sudo dpkg -i linux-image-2.6.26-2-xen-686_2.6.26-15lenny2_i386.deb
linux-modules-2.6.26-2-xen-686_2.6.26-15lenny2_i386.deb

I am not clear with the above step if I have the Xen hypervisor and
dom0 kernel matched
I do not have any idea now how to proceed any further.

On Tue, Nov 17, 2009 at 12:11 AM, Tait Clarridge <tait@xxxxxxxxxxxx> wrote:
> On Mon, 2009-11-16 at 22:45 +0530, Tapas Mishra wrote:
>> I have compiled a Dom0 kernel
>> and kept in boot the images
>> xen-test-vmlinuz
>>  initrd-test-2.6.29.img
>> xen-3.3.gz
>> my /boot/grub/menu.lst looks like this
>>
>> title           TEST Xen 3.3 / Ubuntu 9.04
>> uuid            32ce16fb-1400-4d71-bb37-c98ef140e501
>> kernel          /xen-3.3.gz
>> module          /xen-test-vmlinuz root=/dev/vga/dom0 ro console=tty0
>> module          /initrd-test-2.6.29.2.img
>> quiet
>>
>>
>> I get here an error no of error is 15 and it says could not find the
>> file which file is this message referring to and
>> the number
>> 32ce16fb-1400-4d71-bb37-c98ef140e501
>> what is that number in the grub entries which  I am familiar with we
>> need to specify root device path
>> root (hda0,0)
>> and then some kernel and vmlinuz path are given how do I check what
>> went wrong with me since the kernel compiled without any errors
>> This is the reference which I have followed fully
>> http://www.infohit.net/blog/post/compiling-a-xen-dom0-kernel-for-ubuntu-jaunty.html
>>
>> after compiling the kernel i have installed
>> aptitude install ubuntu-xen-desktop
>> was it required or not
>> every thing done on this system is after formating the machine.
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>
> To give you a sense of what it should look like (some will be different
> for your environment):
>
> title CentOS (2.6.18.8-xen / Xen 3.5 unstable)
>        root (hd0,0)
>        kernel /xen-3.5-unstable.gz dom0_mem=512M
>        module /vmlinuz-2.6.18.8-xen ro root=/dev/VolGroup00/LogVol00
>        module /initrd-2.6.18.8-xen.img
>
> The "quiet" tag should be inline with the kernel section (vmlinuz-xxx in
> my case, xen-test-vmlinuz in yours).
>
> I have never seen a UUID setting for grub... so I am not sure what that
> is there for.
>
> Also, the root device should be where the root installation is.. if you
> look at some of the other kernel entries that would be in the same grub
> file (for non xen kernels) you will see what the root device should be.
>
> eg. (one of my non xen boot entries, snipped for line length)
>
> title CentOS (2.6.18-164.6.1.el5)
>        root (hd0,0)
>        kernel /vmlinuz-xx.el5 ro root=/dev/VolGroup00/LogVol00
>        initrd /initrd-xx.img
>
> This shows me the commands I should pass to the kernel for the xen
> entry.
>
> In this case it told me my root device was "/dev/VolGroup00/LogVol00"
> and what options I should pass to the kernel.
>
> If you still having problems booting the xen kernel and it tells you
> that it cannot find the root device, make sure that all kernel modules
> that are needed to access your disk are loaded into the initrd. There
> are plenty of howtos and blogs if you google this subject.
>
> I don't think ubuntu wants anything special vs CentOS in terms of grub..
> but maybe a Ubuntu person can comment?
>
> Tait
>
>
>
>

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