[CentOS-virt] xenbr0 isn't created anymore

Wed Apr 2 12:41:33 UTC 2008
Richard Chapman <rchapman at aardvark.com.au>

Thanks for the reply Kai.

I will try to clarify...

I originally built the centos 5 system with xen - but I was having 
various network problems. I found that if I booted the alternate "non 
xen" kernel - I had fewer problems. I had no pressing need for xen - so 
I changed the default boot kernel to be the non-xen kernel - so I assume 
I am now NOT running xen. However - dnsmasq still appears to be 
running... Here are some of the commands you suggested...

[root at C5 ~]# service dnsmasq status
dnsmasq (pid 3776) is running...
[root at C5 ~]# ps ax|grep dnsmasq
 3776 ?        S      0:00 dnsmasq --keep-in-foreground --strict-order 
--bind-interfaces --pid-file  --conf-file  --listen-address --except-interface lo 
--dhcp-leasefile=/var/lib/libvirt/dhcp-default.leases --dhcp-range,
25474 pts/2    S+     0:00 grep dnsmasq

This looks to me like some xen stuff is running - in particular the 
192.168.122. subnet looks a bit xen-ish.

But I am confident that the "non xen" kernel is running:

[root at C5 ~]# uname -a
Linux C5.aardvark.com.au 2.6.18-53.1.14.el5 #1 SMP Wed Mar 5 11:37:38 
EST 2008 x86_64 x86_64 x86_64 GNU/Linux

I guess that there must be lots of things I don't understand. It is not 
clear to me whether I am using xen or not - though I am not intending 

I notice that libvirtd is running - and is set to run on boot. Should 
this be the case when running the non xen kernel?

Should I set libvirtd to not start on boot. This might get rid on 
dnsmasq - but is it a safe and good thing to do in my case? Presumably - 
if I want to use xen at some future date - I will need to change kernels 
- and restart libvirtd.

Is there anything else I need to prevent from starting to eliminate all 
traces of xen?



> <E2BB8074E <47F2E96F.5070202 at aardvark.com.au>
> Reply-To: centos-virt at centos.org
> X-Rcpt-To: <centos-virt at centos.org>
> Richard Chapman wrote on Wed, 02 Apr 2008 10:03:27 +0800:
>> In my startup scripts - dnsmasq is set to "not 
>> start on boot" so I thought there was no problem - but I find that in 
>> spite of the startup script - dnsmasq appears to be running.
> What did you do?
> service dnsmasq status
> or
> ps ax|grep dnsmasq
> ?
> dnsmasq would indeed be running, although it's not configured to start, 
> *if* you were using xen, because libvirtd would start it. It's not clear 
> if you are using xen or not.
> Kai