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Dennis Storm - Drecomm BV

2009-Oct-22 14:02 UTC

[Xen-users] Issue when booting DomU with partitioned disk image

Hi,

I have a bunch of Dom0 running on Debian Lenny, stock XEN kernels 
(nothing fancy) Al servers are running quite nicely.

Recently we adde a new server, comparable to our other servers. The only 
big difference is that this server has a RAID-10 array, where the other 
servers have a RAID-1 array.

The DomU''s we deploy are not all that fancy. However, we do partition 
the disk images for the sheer fact our backupsoftware needs to see 
partition tables to create backups (R1Soft CDP). We create the 
partitions with the following commands:

---------
dd if=/dev/zero of=disk.img bs=1M count=100000
dd if=/dev/zero of=swap.img bs=1M count=1024
losetup /dev/loop0 disk.img

# Create partition
fdisk -u -C4096 -S63 -H16 /dev/loop0
n
p
1
[enter]
[enter]
w
losetup -d /dev/loop0

# Remount to skip "bootsector"
losetup -o32256 /dev/loop0 disk.img

#Create filesystem and swapspace
mkfs.ext3 -b1024 /dev/loop0
mkswap swap.img
losetup -d /dev/loop0

mount -text3 -oloop=/dev/loop2,offset=32256 disk.img /mnt
# Rsync our templateserver content into the empty diskimage
rsync -rlHpogDtSxv root@<templateserver>:/ .
# Copy the modules of the running Dom0 kernel into the DomU filesystem
cp -Rvp /lib/modules/* /mnt/lib/modules/

umount -d /mnt
---------

Here''s what we put in the config file:

---------
#
#  Kernel + memory size
#
kernel      = ''/boot/vmlinuz-2.6.26-1-xen-686''
ramdisk     = ''/boot/initrd.img-2.6.26-1-xen-686''
memory      = ''2048''
extra = ''xencons=tty''

#
#  Disk device(s).
#
root        = ''/dev/sda2 ro''
disk        = [
                   ''file:/storage/XXX/swap.img,sda1,w'',
                   ''file:/storage/XXX/disk.img,sda2,w'',
               ]


#
#  Hostname
#
name        = ''XXX''

#
#  Networking
#
vif         = [ ''ip=XXX,mac=XXX'' ]

#
#  Behaviour
#
on_poweroff = ''destroy''
on_reboot   = ''restart''
on_crash    = ''restart''
-------

As you can see, nothing fancy.

Now, the problem: If we boot this DomU it flies through the kernel, but 
when it tries to mount the filesystem, it does absolutely nothing, just 
keeps hanging there (keep in mind, on other Debian Lenny Dom0''s this 
works flawlessly, only difference is the RAID-array!)

I tried to figure out if the Dom0 was broken for some reason, so I used 
xen-create-image to debootstrap a fresh Domu in a raw disk image 
(without partitions, just plain raw), and that one booted just fine with 
the same swapfile and the same config.

Call me flabbergasted, i''m kinda clueless. Any idea''s hints or
brilliant
remarks that could help me figure out this non-enjoyable problem?

-- 
Kind regards,

Dennis Storm - Systems Engineer
Phone: (+31)(50) 577 58 22 (line 9701)
E-mail: d.storm@drecomm.nl


Drecomm BV "Internet Intelligence"
Opensource Internet Solutions

Groningen office:
     Hoendiep 208
     9745 ED  Groningen, The Netherlands
     T:  +31 (0)50 577 58 22
     F:  +31 (0)50 577 58 23

Rotterdam office,  Walenburgerweg 46,  3033 AD  Rotterdam
Amersfoort office, Bergstraat 25, 3811 NE  Amersfoort


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Dennis Storm - Drecomm BV

2009-Oct-23 07:43 UTC

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Re: [Xen-users] Issue when booting DomU with partitioned disk image

> Jamon Camisso wrote:
> Dennis Storm - Drecomm BV wrote:
> <snip>
>> Now, the problem: If we boot this DomU it flies through the kernel, 
>> but when it tries to mount the filesystem, it does absolutely nothing, 
>> just keeps hanging there (keep in mind, on other Debian Lenny
Dom0''s
>> this works flawlessly, only difference is the RAID-array!)
>>
>> I tried to figure out if the Dom0 was broken for some reason, so I 
>> used xen-create-image to debootstrap a fresh Domu in a raw disk image 
>> (without partitions, just plain raw), and that one booted just fine 
>> with the same swapfile and the same config.
>>
>> Call me flabbergasted, i''m kinda clueless. Any idea''s
hints or
>> brilliant remarks that could help me figure out this non-enjoyable 
>> problem?
> 
> Try booting the domU as a fully virtualized guest and see how that 
> works. At least that way you can isolate whether it is your particular 
> domU kernel that is causing the problem, or if it is something else. 
> Make sense?
> 
> JamonDennis Storm - Drecomm BV wrote:

Yes, makes sense. I tried that, and unfortunately still exactly  the 
same issue, it broke down on exactly the same spot. I brought the domU 
down again and copied the disk.img to another Dom0, and there it booted 
up fine... Unfortunately it can''t remain on that Dom0, since the 
customer is paying us for a dedicated Dom0 for only hist DomU''s...

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Maarten Vanraes

2009-Oct-23 12:30 UTC

head link

Re: [Xen-users] Issue when booting DomU with partitioned disk image

could this be the same issue I have?

Op Friday 23 October 2009 09:43:24 schreef Dennis Storm - Drecomm
BV:>  > Jamon Camisso wrote:
> >
> > Dennis Storm - Drecomm BV wrote:
> > <snip>
> >
> >> Now, the problem: If we boot this DomU it flies through the
kernel,
> >> but when it tries to mount the filesystem, it does absolutely
nothing,
> >> just keeps hanging there (keep in mind, on other Debian Lenny
Dom0''s
> >> this works flawlessly, only difference is the RAID-array!)
> >>
> >> I tried to figure out if the Dom0 was broken for some reason, so I
> >> used xen-create-image to debootstrap a fresh Domu in a raw disk
image
> >> (without partitions, just plain raw), and that one booted just
fine
> >> with the same swapfile and the same config.
> >>
> >> Call me flabbergasted, i''m kinda clueless. Any
idea''s hints or
> >> brilliant remarks that could help me figure out this non-enjoyable
> >> problem?
> >
> > Try booting the domU as a fully virtualized guest and see how that
> > works. At least that way you can isolate whether it is your particular
> > domU kernel that is causing the problem, or if it is something else.
> > Make sense?
> >
> > Jamon
>
> Dennis Storm - Drecomm BV wrote:
>
> Yes, makes sense. I tried that, and unfortunately still exactly  the
> same issue, it broke down on exactly the same spot. I brought the domU
> down again and copied the disk.img to another Dom0, and there it booted
> up fine... Unfortunately it can''t remain on that Dom0, since the
> customer is paying us for a dedicated Dom0 for only hist DomU''s...
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users


-- 
BA N.V. - http://www.ba.be

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Xen users - Oct 2009 - Issue when booting DomU with partitioned disk image

[Xen-users] Issue when booting DomU with partitioned disk image

Re: [Xen-users] Issue when booting DomU with partitioned disk image

Re: [Xen-users] Issue when booting DomU with partitioned disk image