Xen users - Mar 2006 - Xen 3.0.1, Debian Sarge: Swap file not recognized in guest

I have installed Xen 3.0.1 on a Debian Sarge base system (see [1],
[2], [3] for details) with image files as drives for the guest
operating system.

My problem is, that the swap "device" on /dev/sda2 is not recognized
by the guest OS:

    INIT: version 2.86 booting
    * Files under mount point ''/dev/shm'' will be hidden.
    Will now activate swap.
    swapon on /dev/sda2
    swapon: cannot stat /dev/sda2: No such file or directory
    * Swap activation failed with error code 255.
    Will now check root file system.

the configuration file looks like this:

    kernel = "/boot/vmlinuz-2.6.12-xenU"
    memory = 512
    name   = "notes"
    root   = "/dev/sda1 ro"
    vif    = [ '''' ]
    disk   = [ ''file:/home/xen/domains/notes/big.img,sda1,w'',
''file:/home/xen/domains/notes/swap,sda2,w'' ]

and /etc/fstab

    /dev/sda1       /       ext3    defaults,errors=remount-ro      0       1
    /dev/sda2       none    swap    sw
    proc            /proc   proc    defaults

I tried both "sda" and "hda" devices - with no change in
behaviour.

/dev/sda2 is not visible in the guest operating system.

An older image with the debian base system (base-config not yet
executed) that the above image was evolved from works fine:

    INIT: version 2.86 booting
    Activating swap.
    EXT3 FS on sda1, internal journal

Any ideas? My Xen-fu is quite young :-)

thanks
Jens-Christian


[1]: http://blog.invisible.ch/2006/03/09/installing-xen-30-on-debian-sarge/
[2]:
http://blog.invisible.ch/2006/03/14/installing-lotus-domino-654-in-debian-xen/
[3]:
http://blog.invisible.ch/2006/03/18/configuring-x-and-domino-server-on-debian-sarge-xen/

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Hi Jens-Christian,

You might want to check the following URL:
http://usefulthings.org.uk/operating-systems/linux/suse/xen-and-suse-93

Although it''s focused on Suse, it could be useful.

Rene

On Sun, 2006-03-19 at 09:55 +0100, Jens-Christian Fischer
wrote:
> I have installed Xen 3.0.1 on a Debian Sarge base system (see [1],
> [2], [3] for details) with image files as drives for the guest
> operating system.
> 
> My problem is, that the swap "device" on /dev/sda2 is not
recognized
> by the guest OS:
> 
>     INIT: version 2.86 booting
>     * Files under mount point ''/dev/shm'' will be hidden.
>     Will now activate swap.
>     swapon on /dev/sda2
>     swapon: cannot stat /dev/sda2: No such file or directory
>     * Swap activation failed with error code 255.
>     Will now check root file system.
> 
> the configuration file looks like this:
> 
>     kernel = "/boot/vmlinuz-2.6.12-xenU"
>     memory = 512
>     name   = "notes"
>     root   = "/dev/sda1 ro"
>     vif    = [ '''' ]
>     disk   = [
''file:/home/xen/domains/notes/big.img,sda1,w'',
> ''file:/home/xen/domains/notes/swap,sda2,w'' ]
> 
> and /etc/fstab
> 
>     /dev/sda1       /       ext3    defaults,errors=remount-ro      0      
1
>     /dev/sda2       none    swap    sw
>     proc            /proc   proc    defaults
> 
> I tried both "sda" and "hda" devices - with no change
in behaviour.
> 
> /dev/sda2 is not visible in the guest operating system.
> 
> An older image with the debian base system (base-config not yet
> executed) that the above image was evolved from works fine:
> 
>     INIT: version 2.86 booting
>     Activating swap.
>     EXT3 FS on sda1, internal journal
> 
> Any ideas? My Xen-fu is quite young :-)
> 
> thanks
> Jens-Christian
> 
> 
> [1]: http://blog.invisible.ch/2006/03/09/installing-xen-30-on-debian-sarge/
> [2]:
http://blog.invisible.ch/2006/03/14/installing-lotus-domino-654-in-debian-xen/
> [3]:
http://blog.invisible.ch/2006/03/18/configuring-x-and-domino-server-on-debian-sarge-xen/
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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Hi jc,

I tried it myself using Sarge and indeed it didn''t work. When I used
the
following command it did work:

#Create swap image
dd if=/dev/zero of=/root/swap.dat bs=1k seek=768k count=1
mkswap /root/swap.dat

Hope this helps,
Rene

On Mon, 2006-03-20 at 06:27 +0100, Jens-Christian Fischer
wrote:
> Hi Rene
> 
> > You might want to check the following URL:
> > http://usefulthings.org.uk/operating-systems/linux/suse/xen-and- 
> > suse-93
> >
> > Although it''s focused on Suse, it could be useful.
> >
> > Rene
> >
> > On Sun, 2006-03-19 at 09:55 +0100, Jens-Christian Fischer wrote:
> >>
> >> My problem is, that the swap "device" on /dev/sda2 is
not recognized
> >> by the guest OS:
> 
> 
> I see nothing swap specific in the above URL (save for creating the  
> swap image file in itself). I have performed the same steps in my  
> installation ans get the above mentioned failure...
> 
> cheers jc

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Jens-Christian Fischer wrote:
> My problem is, that the swap "device" on /dev/sda2 is not
recognized
> by the guest OS:
My similar problem recently was solved by investigation of the /dev/sda2 
device node; in my case, installing udev was my preferred solution to 
arranging for the dom0-exported device to be mountable by the domU.

-- Jared


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>> My problem is, that the swap "device" on /dev/sda2 is not
recognized
>> by the guest OS:
>
> My similar problem recently was solved by investigation of the /dev/ 
> sda2 device node; in my case, installing udev was my preferred  
> solution to arranging for the dom0-exported device to be mountable  
> by the domU.
>
I installed udev (apt-get install udev) first in the domU, then in  
dom0 and now I''m left with a non-working system... :-(

When I create the guest, I get this:

     Error: Device 0 (vif) could not be connected. Hotplug scripts  
not working.

googling tells me to remove the "vif= ['''']" line in
the config file
for the guest. next time I try to create the vm I get:

     Error: Device 2049 (vbd) could not be connected. Hotplug scripts  
not working.

I tried to remove udev (apt-get remove udev) but I''m left with the  
same error messages.

Of course, this is getting critical because I need the server in the  
guest environment asap. I have looked at the /etc/udev files but  
don''t grok what I see there.

I''m running a 2.16.12 kernel:

    Linux sauron 2.6.12.6-xen0 #1 Tue Jan 31 16:03:21 GMT 2006 i686  
GNU/Linux

What can I do to either get my system back to before I started  
messing with udev, or to a working setup with udev?

thanks
jc

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dohh - i needed to reinstall Xen (sh ./install.sh) to get a Xen  
kernel that understand udev...

now the filesystem in my guest OS is fscked up, but I can rebuild  
that...

thanks
jc

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