Xen users - Jul 2005 - Problems creating additional domains ...

Hi,

I''m a XEN-rookie and I have some problems with creating additional
domains. I read lots of tutorials, but I couldn''t get any other domain
than dom-0 (surprise ;) ) to run ...

invader:/etc/xen# xm create -c xmdebian1
Using config file "xmdebian1".
Error: Error creating domain: vbd: Segment phy:hda5 is in writable use

My approach:

1.) downloaded the XEN 2.0.6 binary
2.) installed required packages (iproute, libcurl-dev, twisted,
bridge-utils) via apt-get (on Debian 3.1 base-system)
3.) installed the XEN binary
4.) edited the GRUB Config-file (menu.lst)

### menu.lst ###
title           Debian GNU/Linux, kernel 2.4.27-2-386
root            (hd0,0)
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda3 ro
initrd          /initrd.img-2.4.27-2-386
savedefault
boot

title           Debian GNU/Linux, kernel 2.4.27-2-386 (recovery mode)
root            (hd0,0)
kernel          /vmlinuz-2.4.27-2-386 root=/dev/hda3 ro single
initrd          /initrd.img-2.4.27-2-386
savedefault
boot

title XEN 2.0 / XenLinux 2.6.11
root (hd0,0)
kernel /xen.gz dom0_mem=131072
module /vmlinuz-2.6.11-xen0 root=/dev/hda3 ro console=tty0

5.) deactivated TLS (by renaming /lib/tls)
6.) booted the XEN kernel
7.) installed Debian guest-OS via debootstrap on /dev/hda5
8.) created domain-configuration-file

### xmdebian1 ###
kernel = "/boot/vmlinuz-2.6.11.10-xenU"
memory = 128
name = "xmdebian1"
disk = [''phy:hda5,hda1,w'']
root = "/dev/hda1 ro"

# Network settings
hostname = "Isengart"
nics=1
#vif = [''mac=aa:00:00:00:00:02, bridge=xen-br0'']
dhcp="off"
ip="192.168.1.10"
netmask="255.255.255.0"
gateway="192.168.1.1"
extra = "2"

I hope it''s a beginner''s mistake and not a big issue, would be
nice if
there were any suggestions ... ;)

Jürgen

P.S.: fstab and mount return the following information

-------------------------------------------------------------------------
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>      
<dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda3       /               ext3    defaults,errors=remount-ro 0       1
/dev/hda1       /boot           ext3    defaults        0       2
/dev/hda2       none            swap    sw              0       0
/dev/hdc        /media/cdrom0   iso9660 ro,user,noauto  0       0
/dev/fd0        /media/floppy0  auto    rw,user,noauto  0       0
--------------------------------------------------------------------------
/dev/hda3 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/hda1 on /boot type ext3 (rw)
/dev/hda5 on /mnt/vserver1 type ext3 (rw)
--------------------------------------------------------------------------



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On Tuesday 05 July 2005 15:02, Jürgen Wohltran wrote:
> invader:/etc/xen# xm create -c xmdebian1
> Using config file "xmdebian1".
> Error: Error creating domain: vbd: Segment phy:hda5 is in writable use
[snip, fstab:]
> /dev/hda5 on /mnt/vserver1 type ext3 (rw)
the entire blockdevice hda5 is exported to your xenU guest, so to prevent 
corruption from mounting it twice, it needs exclusive access to that 
blockdevice before starting the xenU kernel.

just "umount /mnt/vserver1" and xm create again.

HTH
/Ernst

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On Tue, Jul 05, 2005 at 03:02:30PM +0200, Jürgen Wohltran
wrote:
> invader:/etc/xen# xm create -c xmdebian1
> Using config file "xmdebian1".
> Error: Error creating domain: vbd: Segment phy:hda5 is in writable use
I assume hda5 is mounted RW in the dom0? Then xenUs should not write
to it too, so the tool obviously notices that and stops you from a
deseaster.
> /dev/hda5 on /mnt/vserver1 type ext3 (rw)
you could probably make it RO in xen0, or not mount it at all. If you
want to write something from dom0 to a domU, you can either use
another partition (note that this may be a file in reality, but the
xenUs can only see it as a block device (if you config it all that
way)) or you can wait for XenFS. Mark will probably announce when 
xenfs is ready.

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Jürgen Wohltran wrote:
>invader:/etc/xen# xm create -c xmdebian1
>Using config file "xmdebian1".
>Error: Error creating domain: vbd: Segment phy:hda5 is in writable use
>
>  
>
Try unmounting /dev/hda5 before starting xmdebian1.
>/dev/hda5 on /mnt/vserver1 type ext3 (rw)
>
>  
>
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On Tue, Jul 05, 2005 at 03:10:18PM +0200, Sascha Retzki
wrote:
>I assume hda5 is mounted RW in the dom0? Then xenUs should not write
>to it too, so the tool obviously notices that and stops you from a
>deseaster.
>> /dev/hda5 on /mnt/vserver1 type ext3 (rw)
>you could probably make it RO in xen0, or not mount it at all. If you
>want to write something from dom0 to a domU, you can either use
>another partition (note that this may be a file in reality, but the
>xenUs can only see it as a block device (if you config it all that
>way)) or you can wait for XenFS. Mark will probably announce when
>xenfs is ready.
Oh ... it work''s - what stupid mistake of mine. Thank you all for your
suggestions ... ;)



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