Re: [Xen-users] pygrub error booting iso

[Gerry Reno <greno@xxxxxxxxxxx>]

Here is the pertinent part of the boot:
[    0.466857] blkfront: xvde: barriers enabled
[    0.470319]  xvde: unknown partition table
[    0.473183] Setting capacity to 6909376
[    0.473197] xvde: detected capacity change from 0 to 3537600512
[    0.473521] blkfront: xvda: barriers enabled
[    0.474962]  xvda: xvda1 xvda2 < xvda5 >
[    0.476335] Setting capacity to 251658240
[    0.476344] xvda: detected capacity change from 0 to 128849018880


Jun 13, 2010 09:46:15 PM, greno@xxxxxxxxxxx wrote:

The furtherest I have gotten with this is to get an initramfs prompt using this config:

name = "RESCUE"
memory = 1024
vcpus = 4
kernel = "/boot/vmlinuz-2.6.32.13"
ramdisk = "/boot/initrd.img-2.6.32.13"
disk = [
    'file:/tmp/iso/ubuntu/10.04/ubuntu-10.04-server-amd64.iso,hdd:cdrom,r',
    "tap:aio:/var/lib/xen/images/CLOUD-CC-1.img,xvda,w"
]



vfb = [ 'type=vnc,vncunused=1' ]

In initramfs I can see the devices:
xvda1,xvda2,xvda5, xvde

And if I mount xvde as iso9660 then I can see the files in the iso.

I don't understand why it cannot perform the boot.  It seems like everythng is there.
This is using pv_ops kernel 2.6.32.13 and Xen 4.0.0-rc8

-Gerry



Jun 13, 2010 07:34:45 PM, greno@xxxxxxxxxxx wrote:

ok, some other things that are weird:
 hdc ends up on xvda
 hdd ends up on xvde
Huh?

I don't know whether this is pygrub or Xen that's causing the problems.

-Gerry





Jun 13, 2010 06:54:02 PM, greno@xxxxxxxxxxx wrote:

You mean like this?:
disk = [
    'file:/tmp/ubuntu/10.04/ubuntu-10.04-server-amd64.iso,hdc:cdrom,r',
    "tap:aio:/var/lib/xen/images/CLOUD-CC-1.img,xvda,w"
]

Gives me the exact same result:
Error: Boot loader didn't return any data!

I've verified the paths to the kernel and ramdisk.  It's weird because I did this some time ago without any problem.  But now it doesn't work.  Maybe because I updated to Xen 4.0.0-rc8?   Pygrub says version 0.6 inside it.

-Gerry


Jun 13, 2010 06:19:46 PM, tknchris@xxxxxxxxx wrote:

Why not just use file: and iso path? I don't see any benefit to
another layer of abstraction

Sent from my iPhone

On Jun 13, 2010, at 5:49 PM, greno@xxxxxxxxxxx wrote:

> I mounted an iso file like so:
> -------------------------------------------
> # mount -o loop=/dev/loop0 /path/to/iso /tmp/mnt
> #ls /tmp/mnt
> cdromupgrade dists doc install isolinux md5sum.txt pics pool
> preseed README.diskdefines ubuntu
> -------------------------------------------
>
> I used the following file to try to have pygrub boot the mounted iso:
> -------------------------------------------
> name = "RESCUE"
> memory = 1024
> vcpus = 4
> bootloader = '/usr/local/bin/pygrub'
> kernel = "/boot/vmlinuz-2.6.32.13"
> ramdisk = "/boot/initrd.img-2.6.32.13"
> disk = [
> 'phy:/dev/loop0,hdc:cdrom,r',
> "tap:aio:/var/lib/xen/images/CLOUD-CC-1.img,xvda,w"
> ]
>
>
>
>
> vfb = [ 'type=vnc,vncunused=1' ]
> -------------------------------------------
>
> Then I tried to create:
> -------------------------------------------
> # xm create test.py
> Using config file "./test.py".
> Error: Boot loader didn't return any data!
> -------------------------------------------
>
> Is there something else I need to get pygrub to boot an iso?
>
> -Gerry
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users

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