Re: [Xen-users] Xen 4.0 Custom kernels

[Richie <listmail@xxxxxxxxxxxx>]

I have not been following this thread, but I just wanted to add in some 
commands that I think would be useful for determining whether or not the 
initrd is going to work on the domU
# assuming same kernel and initrd is being used, run this on dom0
$ grep XEN /boot/config-$(uname -r)

if the settings are CONFIG_XEN_BLKDEV_FRONTEND=m and 
CONFIG_XEN_NETDEV_FRONTEND=m, then:
$ zcat /boot/initrd.img-$(uname -r) | cpio -it | grep xen

and make sure the xen-blkfront.ko and xen-netfront.ko modules are listed



Net Warrior wrote:
> Hi There.
> Sorry for the delay, here is the config file for DomU , Only the 
> options I modified, the rest is as it is, by default.
> # Kernel image file.
> kernel = "/boot/vmlinuz-2.6.31.13"
>
> # Optional ramdisk.
> ramdisk = "/boot/initrd-2.6.31.13.img"
>
> memory = 64
>
> # A name for your domain. All domains must have different names.
> name = "Netwarrior"
>
> vif = [ '' ]
> disk = [ 'phy:VG-NW/root,sda1,w','phy:VG-NW/swap,sda2,w' ]
>
> # Set root device.
> root = "/dev/sda1 ro"
>
>
> # Sets runlevel 4.
> extra = "4"
>
> How do I know which hardware Xen ( Dom0 ) is providing to the DomU ?
>
>
> Thank you very much.
> Regards
>
> 2010/5/14 Pasi Kärkkäinen <pasik@xxxxxx <mailto:pasik@xxxxxx>>
>
>     On Fri, May 14, 2010 at 07:47:33AM -0300, Net Warrior wrote:
>     >    Hi There.
>     >    The hardware is the same, so I asume that the initramfs used
>     for Dom0
>     >    could be used for DomU as well
>     >
>
>     No, the hardware is not the same!
>
>     domU only has "virtual" hardware provided by Xen, which is totally
>     different
>     from the physical hardware dom0 has access to!
>
>
>     , and yes I specified the root partition in
>     >    the DomU config file as well something like root /dev/sda1 ro
>     , should I
>     >    use xdev as well in there?
>     >    Thanks for your time and support.
>     >
>
>     Please paste your /etc/xen/<guest> cfgfile.
>
>     -- Pasi
>
>     >    Best Regards
>     >    2010/5/14 Pasi Kärkkäinen <[1]pasik@xxxxxx <mailto:pasik@xxxxxx>>
>     >
>     >      On Thu, May 13, 2010 at 07:40:51PM -0300, Net Warrior wrote:
>     >      > Hi there guys
>     >      >
>     >      > As a test, I started using the same kernel and initramfs
>     like in Dom0
>     >      > which i know it works, but when starting up DomU I've get.
>     >      >
>     >      > switchroot: mount failed: No such file or directory
>     >      > Kernel panic - not syncing: Attempted to kill init!
>     >      > Pid: 1, comm: init Not tainted 2.6.31.13 #14
>     >      >
>     >
>     >      So the dom0 initrd image is not suitable for domU, ie. it
>     doesn't load
>     >      xen block frontend driver.. most probably. So the domU
>     kernel is
>     >      not able to access the virtual disks provided to it.
>     >      > I've got the same error while setting up Dom0 and was a
>     problem with
>     >      > the scsi modules which I included in the kernel and not
>     in the
>     >      > initramfs, my bad !!
>     >      >

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