Re: [Xen-users] Cannot have eth0 in domU

[Phil Evans <xenmail@xxxxxxxxxxxx>]

I have also had this problem with the FC5 domU kernel.  It turns out 
they decided to make the xennet kernel driver a module instead of 
compiled in.  All you need to do is in the "/etc/modprobe.conf" file of 
your guest, make sure it has the following line:
alias eth0 xennet

This means the kernel will load the xennet module for eth0.

Thanks,
Phil Evans.


Denis Lebeuf wrote:
> Hello,
>
> I am trying to run Xen 3 on FC5, but I cannot have the eth0 interface appear 
> in domU. I read nearly everything in this list that could look similar to my 
> problem but to no avail.
> I have 3 servers running FC3 and Xen 2 with various domUs since a year. 
> Everything is fine on that front.
> I took one of the server, upgraded it to FC5 and did the following:
>
> - yum install xen kernel-xen0 kernel-xenU
> - grub.conf contains
>   title Fedora Core (2.6.15-1.2054_FC5xen0
>   root (hd0,0)
>   kernel /boot/xen.gz-2.6.15-1.2054_FC5
>   module /boot/vmlinuz-2.6.15-1.2054_FC5xen0 root=LABEL=/ ro console=tty0 
> noscsi
>   module /boot/initrd-2.6.15-1.2054_FC5xen0.img
> - rebooted with the xen0 kernel
> - kept the default xend-config.sxp to use bridging
> - started xend
> - copied a domU FC3 image from another server (tried also with a trustix 
> image)
> - mounted the FC3 image in loop fs and copied (cp 
> -a) /lib/modules/2.6.15-1.2054_FC5xenU to it
> - created a domU configuration file:
>   kernel = "/boot/vmlinuz-2.6.15-1.2054_FC5xenU.img"
>   memory = 128
>   name = "test"
>   vif = [ '' ]
>   disk = [ 'file:/images/fc3,sda1,w' ]
>   root = "/dev/sda1 ro"
>   extra = "4"
> - xm create -c test.conf
> - everything in domU is fine except that eth0 is not seen:
>   ifconfig eth0
>   eth0: error fetching interface information: Device not found
> - "ifconfig -a" shows lo and sit0 only
> - on dom0:
>    brctl show
>    bridge name        bridge id                STP enabled        interfaces
>    xenbr0                    8000.feffffffffff        no                        
>       peth0
>                                                                                 
>                              vif0.0
>                                                                                 
>                              vif1.0
> - domU image contains valid ifcfg-eth0 configuration file
>   I tried to add network configuration into the domU configuration file:
>     ip="10.10.10.10"
>     netmask="255.255.255.0"
>     gateway="10.10.10.1"
>     broadcast="10.10.10.255"
>   and got the same results.
> - I tried with and without a ramdisk image in the domU conf file (getting 
> desperate here)
> - no errors in domU dmesg or with "xen dmesg" on dom0
>
> I really don't know where to go from here. I made several attempts with 
> variations in config files but always got the same problem. Am I missing 
> something obvious? Any suggestion as to what tools I can use to troubleshoot?
> Any help would be greatly appreciated.
>
> Thanks a lot
>
> Denis
>
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>   

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