Re: [Xen-users] DomU in it's own LVM partition fails to boot CentOS 5.2 Dom0/U

[Mike Brady <mike.brady@xxxxxxxxxxxxxx>]

You need a ramdisk configured.

For instance to kickstart a Centos DomU I have:
kernel = "/etc/xen/centos52_x86_install.vmlinuz"
ramdisk = "/etc/xen/centos52_x86_install.initrd.img"
extra = "ks=http://192.168.42.60/ks-xen-hit42.cfg";

Where the vmlinuz and initrd files are from the images/xen directory
from the Centos install media.

After the installation is complete comment out the kernel, ramdisk and
extra entries and add
bootloader="/usr/bin/pygrub"

to the config file.

On Sat, 2009-01-24 at 13:19 -0500, Peter Hoose wrote:
> I'm trying to do what I think would be relatively simple but can't
> seem to make it work. Essentially I want to create several domU's
> running CentOS each with it's own LVM partition for increased
> performance over image files.
> 
> Initially I did a test with image files and everything went fine, I
> booted the supplied initrd and vmlinuz images installed CentOS from
> http, etc... However, the performance of image files is pretty slow
> for what I intend to use this for (Web/DB servers). So I wanted to do
> the same thing but in a dedicated partition. Problem is, when I do
> this and try to install via http, the disk doesn't show up in the
> installer, it just shows a "#". This appears to be expected when using
> a dedicated partition and the solution seems to be to copy an image to
> my partition and go that route. I tried this 2 different ways: 1:
> jailtime image 2: copy of my dom0 OS. For the jailtime image using the
> supplied config file with my disk substituted:
> 
> kernel = "/var/lib/xen/boot/CentOS/CentOS_5_x64_vmlinuz"
> name = "guest01"
> memory = "1024"
> disk = [ 'phy:/dev/VolGroup00/guest01,xvda1,w', ]
> vif = [ 'bridge=xenbr0', ]
> vcpus=1
> root="/dev/xvda1"
> extra = "fastboot"
> on_reboot = 'restart'
> on_crash = 'restart'
> 
> I get the following error:
> 
> VFS: Cannot open root device "xvda1" or unknown-block(0,0)
> Please append a correct "root=" boot option
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(0,0)
> 
> When I try to copy my own OS the file copy takes forever (only 20G)
> and my load average starts creeping up to 3+, which I assume may have
> to do with the fact that I'm running cp -ax / /mnt/guest01 which may
> loop copying /mnt/guest01 to itself or something similar? Or maybe
> this is expected and I'm just impatient :)
> 
> Anyways, long story short, is there a way to install to a partition
> via HTTP like with disk images? If not, what am I doing wrong using
> the prebuilt images? 
> _______________________________________________
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> http://lists.xensource.com/xen-users


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