Re: [Xen-users] how to mount domU images on dom0

[Thomas Jensen <tom.jensen@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, 16 Nov 2009 21:42:50 +0530, Tapas Mishra <tapas@xxxxxxxxxxxx>
wrote:
> I am installing domU image
> 
> after executing the following command
> 
> xen-create-image --hostname=mydomU --ip 192.168.1.22 --gateway
> 192.168.1.250 --netmask 255.255.255.0 --broadcast 192.168.1.255
> --dist=jaunty  --mirror=http://archive.ubuntu.com/ubuntu --size=4Gb
> --memory=64Mb --swap=128MB --arch=i386 --partitions=with-data  --boot
> --passwd --role udev
> 
> 
> I get following message at the last
> 
> 
> 
> Creating ext3 filesystem on /workarea/xen/domains/mydomU/data.img
> Done
> Installation method: debootstrap
> Done
> 
> Running hooks
> Done
> 
> Role: udev
>       File: /etc/xen-tools/role.d/udev
> Role script completed.
> 
> Creating Xen configuration file
> Done
> Setting up root password
> Enter new UNIX password:
> Retype new UNIX password:
> passwd: password updated successfully
> All done
> root@abhitech-desktop:~# Started new Xen guest: mydomU
> [/etc/xen/mydomU.cfg]
> 
> 
> Logfile produced at:
>        /var/log/xen-tools/mydomU.log
> 
> Now here is the problem since the terminal on which it happened cursor
> is blinking it is not even giving me the shell to log in or execute
> any command so someone on IRC suggested me to mount the images
> 
I too started out using Xen with Ubuntu for both Dom0 and DomU machines. 
At the time, I was using the Ubuntu 8.04 LTS version and used the distro
specific install through apt-get.  Anyhow, I encountered a lot of problems
with console logins.  After searching the Internet, I found I wasn't alone.
I discovered a lot of patches required to fix login issues as well as
problems with the shutdown of Ubuntu domains.  You have mentioned both of
these problems in your recent posts.

I have sinced moved to Debian Lenny for Dom0 and all DomU machines.  That
change has made a huge difference in the stability I have experienced with
Xen.

However, I still had to add configuration variables to my config files to
ensure the console matches between Xen and my Debian virtual machine.  The
instructions I used were on the Xen wiki website and was listed as a known
issue with Debian.

Despite those configuration changes, I sometimes still see the blank
console as you described when using the xm console command.  Whenever this
occurs, I simply hit the enter key on the keyboard and the login prompt
shows up on my console.

It is by no means scientific and I don't have a technical explanation for
why this occurs.  But it works and that is good enough for me in most
situations.
> 
> Before I do that  xm list shows me the following output
> 
> root@abhitech-desktop:~# xm list
> Name                                        ID   Mem VCPUs      State  
> Time(s)
> Domain-0                                     0   364     1     r-----  
> 2547.1
> mydomU                                       2    64     1     -b----   

> 9.5
> root@abhitech-desktop:~#
> 
> 
> and if I execute xm console mydomU then it gave me erro mydomU is not
> installed where as
> in the domains directory I have
> root@abhitech-desktop:/workarea/xen/domains/mydomU# ls
> data.img  root.img  swap.img
> all the above files whose sizes are
> 
> root@abhitech-desktop:/workarea/xen/domains/mydomU# du -ch ./*
> 194M  ./data.img
> 719M  ./root.img
> 4.0K  ./swap.img
> 913M  total
> 
I also started out using disk image files.  I have sinced moved to using
logical partitions through LVM for my DomU disks.  It is very easy to mount
these logical volumes in Dom0 with the mount command.  Mounting should be
done when the DomU is not running.  One mounted, you can edit files for the
DomU from the Dom0 console.
> 
> Now how should I proceed
> console is not letting me log in inspite of my repeated attempts
> 
> 
> 
> 
> 
> 
> On Mon, Nov 16, 2009 at 9:24 PM, Arpan Jindal <jindalarpan@xxxxxxxxx>
> wrote:
>> can you explain it in details what are you doing and where you are
facing
>> this issue?
>>
>> On Mon, Nov 16, 2009 at 9:22 PM, Tapas Mishra <tapas@xxxxxxxxxxxx>
wrote:
>>>
>>> how to mount the domU images on dom0 to chroot them
>>> Âmount it on the dom0 and chroot to it. ÂI am getting an error xen
>>> console mydomU
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@xxxxxxxxxxxxxxxxxxx
>>> http://lists.xensource.com/xen-users
>>
>>
> 
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> http://lists.xensource.com/xen-users

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