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Re: [Xen-users] domU eth0 missing after reboot

On Tue, Jan 22, 2013 at 5:14 PM, Greg Woods <woods@xxxxxxxx> wrote:
On Mon, 2013-01-21 at 23:38 +0200, Rudi Ahlers wrote:
> Hi,
> I have a CentOS server with 4 CentOS domU's, of which I rebooted the
> one domU and now this particular domU's eth0 device is missing.
I don't know if this is your problem, but CentOS guests do really weird
things with the network configuration. Check the guest
in /etc/sysconfig/network-scripts and make sure that the ifcfg-eth0 file
still has the correct information in it. I've had mine (seemingly)
randomly switch back to default DHCP from a fixed IP configuration. This
happens often enough that all my guests have a ifcfg-eth0.bak file so
that I can easily copy back the old configuration when this happens.

I have never seen this happen with a native CentOS, only when CentOS is
a Xen guest. If anyone knows why that happens, I would love to know as
it is a major annoyance.


Thanx Greg, 

This didn't happen in my case. There was just no eth0 / eth1 device at all, even though the XEN .cfg file had the vif line in. I rebooted the server since it didn't want to automatically increase the RAM, and after that there was no network interface. 

I downloaded the latest kernel rpm and installed that, thinking the kernel was corrupt or something but that didn't even help. At the end of the day I ended having to create a new domU and copy the website and MySQL data across manually.  

Kind Regards
Rudi Ahlers

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