Re: [Xen-users] Xen 3.4.1: pygrub Error: Boot loader didn't return any data!

[Gerry Reno <greno@xxxxxxxxxxx>]

Fajar A. Nugraha wrote:
> On Thu, Dec 31, 2009 at 12:17 PM, Gerry Reno <greno@xxxxxxxxxxx> wrote:
>   
> > > > bootloader = "/usr/bin/pygrub"
> > > > disk = [ "tap:aio:/var/lib/xen/images/CLOUD-CC-1.img,xvda5,w" ]
> > > >
> > > >         
> > > First of all, where on earth did you get your conversion instructions
> > > from?
> > >
> > >       
> > This looks like it:
> > http://lists.centos.org/pipermail/centos-virt/2009-November/001306.html
> >     
> The example there says to map the disk as xvda :)
>
>   
> > The original kvm guest had:
> > /dev/vda5  /boot
> > /dev/mapper/vg....   /
> >
> > So I changed all references of /dev/vda5 to /dev/xvda5 in guest.  I figured
> > the lvm would take care of itself.
> >     
> yes, you need to change it on the guest.
>
> Let's try some things:
> (1) Keep the disk mapped as xvda on domU config file.
> (2) assign /var/lib/xen/images/CLOUD-CC-1.img to a loopback device,
> and use kpartx on it (something like "LOOP=`losetup -f`;losetup $LOOP
> /var/lib/xen/images/CLOUD-CC-1.img;kpartx -av $LOOP")
> (3) run "fdisk -l $LOOP"
> (4) mount the partition on domU (something like "mount
> /dev/mapper/loop0p5 /mnt/tmp")
> (5) ls -la /mnt/tmp /mnt/tmp/boot/grub/menu.lst (or whatever your
> mount point is)
> (6) paste the content of menu.lst (relevant parts only, no need to
> paste commented entries)
> (7) run "/usr/bin/pygrub -i /var/lib/xen/images/CLOUD-CC-1.img"
>
>   
Here are the results:

root@grp-01-23-02:/var/lib/xen/images# LOOP=`losetup -f`
root@grp-01-23-02:/var/lib/xen/images# echo $LOOP
/dev/loop0
root@grp-01-23-02:/var/lib/xen/images# losetup $LOOP 
/var/lib/xen/images/CLOUD-CC-1.img
root@grp-01-23-02:/var/lib/xen/images#
root@grp-01-23-02:/var/lib/xen/images# kpartx -av $LOOP
add map loop0p1 (252:5): 0 251160147 linear /dev/loop0 63
add map loop0p2 (252:6): 0 498015 linear /dev/loop0 251160210
add map loop0p5 (252:7): 0 497952 252:6 63
root@grp-01-23-02:/var/lib/xen/images#
root@grp-01-23-02:/var/lib/xen/images# fdisk -l $LOOP

Disk /dev/loop0: 128.8 GB, 128849018880 bytes
255 heads, 63 sectors/track, 15665 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000438c1

     Device Boot      Start         End      Blocks   Id  System
/dev/loop0p1   *           1       15634   125580073+  8e  Linux LVM
/dev/loop0p2           15635       15665      249007+   5  Extended
/dev/loop0p5           15635       15665      248976   83  Linux
root@grp-01-23-02:/var/lib/xen/images#
root@grp-01-23-02:/var/lib/xen/images# ls /mnt
boot  iso
root@grp-01-23-02:/var/lib/xen/images# mkdir /mnt/tmp
root@grp-01-23-02:/var/lib/xen/images# mount /dev/mapper/loop0p5 /mnt/tmp
root@grp-01-23-02:/var/lib/xen/images# ls -la /mnt/tmp 
/mnt/tmp/boot/grub/menu.lst
ls: cannot access /mnt/tmp/boot/grub/menu.lst: No such file or directory
/mnt/tmp:
total 87516
drwxr-xr-x 5 root root     1024 2009-12-30 14:57 .
drwxr-xr-x 5 root root     4096 2009-12-31 00:50 ..
-rw-r--r-- 1 root root   623709 2009-10-16 12:44 abi-2.6.31-14-server
-rw-r--r-- 1 root root   105771 2009-10-16 12:44 config-2.6.31-14-server
-rw-r--r-- 1 root root   105086 2009-12-27 20:05 config-2.6.31.6
drwxr-xr-x 2 root root     1024 2009-12-30 18:13 grub
drwxr-xr-x 2 root root     5120 2009-12-30 14:03 grub_backup
-rw-r--r-- 1 root root  7424257 2009-12-12 20:06 initrd.img-2.6.31-14-server
-rw-r--r-- 1 root root 68728004 2009-12-27 21:10 
initrd.img-2.6.31.6-fromHost
drwx------ 2 root root    12288 2009-12-06 23:36 lost+found
-rw-r--r-- 1 root root   128796 2009-10-23 12:24 memtest86+.bin
-rw-r--r-- 1 root root  2129198 2009-10-16 12:44 System.map-2.6.31-14-server
-rw-r--r-- 1 root root  2087202 2009-12-27 20:58 System.map-2.6.31.6
-rw-r--r-- 1 root root     1335 2009-10-16 12:50 vmcoreinfo-2.6.31-14-server
-rw-r--r-- 1 root root  3934784 2009-10-16 12:44 vmlinuz-2.6.31-14-server
-rw-r--r-- 1 root root  3953856 2009-12-27 20:58 vmlinuz-2.6.31.6
root@grp-01-23-02:/var/lib/xen/images# ls -la /mnt/tmp/grub/menu.lst
-rw-r--r-- 1 root root 4631 2009-12-30 15:56 /mnt/tmp/grub/menu.lst
root@grp-01-23-02:/var/lib/xen/images#
root@grp-01-23-02:/var/lib/xen/images# cat /mnt/tmp/grub/menu.lst | sed 
-e '/^$/d' -e '/ *#.*$/d'
default         0
timeout         3
hiddenmenu
title           Ubuntu 9.10, kernel 2.6.31.6
root            (hd0,4)
kernel          /vmlinuz-2.6.31.6 root=/dev/mapper/grp--01--40--51-root 
ro quiet splash
title           Ubuntu 9.10, kernel 2.6.31.6 (recovery mode)
root            (hd0,4)
kernel          /vmlinuz-2.6.31.6 root=/dev/mapper/grp--01--40--51-root 
ro  single
title           Ubuntu 9.10, kernel 2.6.31-14-server
root            (hd0,4)
kernel          /vmlinuz-2.6.31-14-server 
root=/dev/mapper/grp--01--40--51-root ro quiet splash
initrd          /initrd.img-2.6.31-14-server
title           Ubuntu 9.10, kernel 2.6.31-14-server (recovery mode)
root            (hd0,4)
kernel          /vmlinuz-2.6.31-14-server 
root=/dev/mapper/grp--01--40--51-root ro  single
initrd          /initrd.img-2.6.31-14-server
title           Ubuntu 9.10, memtest86+
root            (hd0,4)
kernel          /memtest86+.bin
root@grp-01-23-02:/var/lib/xen/images#
root@grp-01-23-02:/var/lib/xen/images# /usr/bin/pygrub -i 
/var/lib/xen/images/CLOUD-CC-1.img
Traceback (most recent call last):
 File "/usr/bin/pygrub", line 676, in <module>
   fs = fsimage.open(file, get_fs_offset(file))
IOError: [Errno 95] Operation not supported
root@grp-01-23-02:/var/lib/xen/images#


-Gerry


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