Solved: Re: [Xen-users] Trouble with manual bridging on Xen3/CentOS 5

[Digimer <linux@xxxxxxxxxxx>]

On 04/30/2011 02:41 AM, Fajar A. Nugraha wrote:
> On Sat, Apr 30, 2011 at 5:08 AM, Digimer <linux@xxxxxxxxxxx> wrote:
>> Hi all,
>>
>>  While trying to sort out/test some patches, I was told that it's best
>> to create bridges manually in
>> /etc/sysconfig/network-scripts/ifcfg-xenbr*. I did this, commented out
>> (network-script network-bridge) and restarted the network and Xen.
> 
> Did you restart the dom0?

Yup. :)

>> # virt-install --connect xen --name vm0002_pppoe --ram 2048 --arch
>> x86_64 --vcpus 1 --cpuset 1-7 --location http://10.255.0.1/f9/x86_64/img
>> --os-type linux --os-variant rhel5.4 --disk
>> path=/dev/drbd_x4_vg0/vm0002_1 --network bridge=xenbr0 --network
>> bridge=xenbr2 --vnc --paravirt --debug
> 
> Do you have xenbr0 and xenbr2 bridge?

Yup.

>> Fri, 29 Apr 2011 17:32:12 DEBUG    Requesting libvirt URI xen
>> Fri, 29 Apr 2011 17:32:12 ERROR    unable to connect to
>> 'localhost:8000': Connection refused
> 
> The message should be clear. Is xend running? Is it listening on port
> 8000 (try "netstat -anp")?
> 
>>  Thinking that I still needed to use '(network-script network-bridge)',
>> so I put it back (actually, a modified version I will link below). When
>> I start xend after putting it back, I got such an incredible flood that
>> all network communications were lost on the network. Obviously, I'm
>> reluctant to randomly try things now.
> 
> Duh :P
> 
> That's part of the reason why I asked "did you restart the dom0".
> "service network restart" does not necessarily do what you think it
> should do (for example, it determines what interface to take up/down
> based on config file, not what interface is actually up).

Ya... I've long gotten into the habit of rebooting my test nodes
whenever I played with Xen's networking for just this reason.

>>  So, if I manually build the bridges, how am I supposed to configure
>> Xen to use them?
> 
> I simply modify Xen config file (/etc/xen/*) to use the bridge I
> created (on vif line).

I finally got this sorted out, and here is the new patch and comments on
what was needed to make it work:

https://bugzilla.redhat.com/show_bug.cgi?id=697021#c11

Thanks for the reply!

-- 
Digimer
E-Mail: digimer@xxxxxxxxxxx
AN!Whitepapers: http://alteeve.com
Node Assassin:  http://nodeassassin.org

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