Re: [Xen-devel] pv-grub: trouble when using UUID

[Gerry Reno <greno@xxxxxxxxxxx>]

Using pv-grub config, here is what happens on the 'xm create':
--------------------------------------------------------
kernel  /boot/vmlinuz-2.6.32-22-server root=UUID=b59e45e2-3137-4685-a31c-a8c87a
65c4fc ro console=hvc0 splash 

Error 21: Selected disk does not exist

Press any key to continue...
--------------------------------------------------------

and when you press key you go back to the grub boot selection menu.  And there if you add the line 'root (hd0)' before the kernel line and then boot, the domain boots up to a login.  I tried adding instead 'uuid b59e45e2-3137-4685-a31c-a8c87a65c4fc' but grubdom does not recognize that command, so the 'root (hd0)' just substitutes for the uuid command.

So it looks like what pv-grub is missing in the process is a
'uuid b59e45e2-3137-4685-a31c-a8c87a65c4fc' before executing the kernel line.

-Gerry



Jun 16, 2010 05:37:38 PM, greno@xxxxxxxxxxx wrote:

Correction: In grubdom if I just add a line 'root (hd0)' then it will boot fine.

xen: 4.0.0-rc8


Jun 16, 2010 05:29:46 PM, greno@xxxxxxxxxxx wrote:

I have two filesystem images that I built: root and /mnt and with a guest menu.lst that uses UUID I am able to create a running xen domain using either a normal 'xm' config or a 'pygrub' bootloader config.

I am unable to create a working config using 'pv-grub' however using UUID.

The guest menu.lst uses 'uuid' rather than 'root' and whenever I try to create the domain using 'pv-grub' it always drops me to a 'grubdom' prompt.  In grubdom if I just add a line 'root=/dev/xvda1' then it will boot fine.  I cannot test 'uuid' in grubdom because it does not recognize the 'uuid' command.

Here are details:

host: pv_ops dom0  kernel 2.6.32.13
guest: ubuntu  kernel 2.6.32-22-server

========================================
pv-grub configfile:
========================================
name = "test"

maxmem = 4096
memory = 1024
vcpus = 4

uuid = "b59e45e2-3137-4685-a31c-a8c87a65c4fc"
kernel = "/usr/lib/xen/boot/pv-grub-x86_64.gz"
extra = "(hd0)/boot/grub/menu.lst"

disk = [
  "tap:aio:/root/ubuntu-xen/root.img,xvda1,w",
  "tap:aio:/root/ubuntu-xen/____.img,xvdb,w"
 ]

vif = [ "mac=00:16:1a:2a:ef:56,bridge=br0" ]





========================================
guest /boot/grub/menu.lst:
========================================
default        0
timeout        3
hiddenmenu

title        Ubuntu 10.04 LTS, kernel 2.6.32-22-server
uuid        b59e45e2-3137-4685-a31c-a8c87a65c4fc
kernel        /boot/vmlinuz-2.6.32-22-server root=UUID=b59e45e2-3137-4685-a31c-a8c87a65c4fc ro console=hvc0 splash
initrd        /boot/initrd.img-2.6.32-22-server

title        Ubuntu 10.04 LTS, kernel 2.6.32-22-server (recovery mode)
uuid        b59e45e2-3137-4685-a31c-a8c87a65c4fc
kernel        /boot/vmlinuz-2.6.32-22-server root=UUID=b59e45e2-3137-4685-a31c-a8c87a65c4fc ro  single
initrd        /boot/initrd.img-2.6.32-22-server

========================================
tune2fs -l /dev/loop0  # root fs
========================================
tune2fs 1.41.11 (14-Mar-2010)
Filesystem volume name:  
Last mounted on:         
Filesystem UUID:          b59e45e2-3137-4685-a31c-a8c87a65c4fc
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Filesystem flags:         signed_directory_hash
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              655360
Block count:              2621440
Reserved block count:     131072
Free blocks:              2413274
Free inodes:              632869
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      639
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Filesystem created:       Wed Jun 16 03:46:23 2010
Last mount time:          Wed Jun 16 13:15:24 2010
Last write time:          Wed Jun 16 13:15:24 2010
Mount count:              5
Maximum mount count:      31
Last checked:             Wed Jun 16 03:46:23 2010
Check interval:           15552000 (6 months)
Next check after:         Mon Dec 13 02:46:23 2010
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:              256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      afd06bb1-27d7-4921-a8fc-693df864acf5
Journal backup:           inode blocks

========================================
========================================

Can anyone see what is missing?  I thought UUID should work with pv-grub but it is failing for me.

-Gerry

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