1

Problem

The Ethernet virtual device of my DomU doesn't seems to load and I can't explain why.

Context

Dom0 Info

Dom0 : Debian Wheezy with Xen

uname -r : 3.2.0-4-amd64

Dom0 dmesg

[11:55]root@Dopamine2:~[0]# dmesg | grep Network
[   11.550947] Intel(R) Gigabit Ethernet Network Driver - version 3.2.10-k
[   11.627242] igb 0000:03:00.0: Intel(R) Gigabit Ethernet Network Connection
[   11.705513] igb 0000:03:00.1: Intel(R) Gigabit Ethernet Network Connection

Dom0 lspci

03:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
03:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)

One Working DomU

I have 1 x fresh DomU (wheezy), installed with "xen-create-image", working perfectly. When I do a dmesg on this DomU, we can see inside : "Initialising Xen virtual ethernet driver"

Failing DomU (the problem)

But another existing DomU (that I want to migrate from an old Dom0 to the new one), also a Debian wheezy, seems to be not working. Network is not loaded :

/etc/init.d/networking restart
[warn] Running /etc/init.d/networking restart is deprecated because it may not re-enable some interfaces ... (warning).
[....] Reconfiguring network interfaces...Cannot find device "eth0"
Failed to bring up eth0.

When I do a dmesg on this failing box, the "Initialising Xen virtual ethernet driver" is NOT inside.

(I don't know what other information I can provide ?)

1

Maybe you need to load some missing modules in your guest

Try lsmod | grep xen in your working guest and failing guest and compare them. If you see a difference, try to load this module in your Dom0 /etc/initramfs-tools/modules and update the initramfs

I suspect that you should load the xen_netfront module.

Add the missing module

echo xen_netfront >> /etc/initramfs-tools/modules

Update initramfs

cd /tmp
mkinitramfs $(uname -r) -o /tmp/initrd-$(uname -r) 
cp /tmp/initrd-$(uname -r) /boot/initrd-$(uname -r)

This is the file you should load in your /etc/xen/your-guest.cfg

For example ramdisk = '/boot/initrd-3.2.0-4-amd64'

Then shutdown and re-create the failing guest

xm shutdown guest
xm create guest.cfg

And check the result.

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