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Re: [libvirt] Network Interface: How to disable virbr0 correctly?





On Tue, Mar 8, 2011 at 11:20 AM, Matthias Bolte <matthias bolte googlemail com> wrote:
2011/3/8 Jake Xu <jake demonwaremail net>:
> Hi Cole,
> Thanks for the wiki link. It would be so useful if the ESX driver supported
> those commands. It seems like the ESX driver does not support most of the
> network or interface configuration.

What do you mean by " those commands"?

The problem with implementing ESX networking support in libvirt is
that ESX's and libvirt's network model don't match directly and it's
not entirely clear how two map those two in a useful way.

Can you be more specific about what you need in terms of network management?

Sorry if I did not make it clear. For commands, I meant the net-list, net-destroy, etc commands in virsh.

I am actually using the libvirt Python-bindings to write scripts which automate the VM creation process. All I need in terms of network management is that I want it to have two interfaces eth0 and eth1 with static ip addresses(gateway, subnet, etc), so I don't need any other extra configuration such as virtbr0 provided by libvirt/libvirtd daemon. Is there any way to prevent libvirtd daemon being installed on the guest VM?
 
> Regarding the eth1 interface, I am not sure why the autostart.xml could
> affect bringing up eth1. Before I made changes to the autostart.xml or
> renamed the folder completely, the VMs have all interfaces installed: eth0,
> eth1, virbr0 (even though the virbr0 and its iptable rules seem to be a bit
> difficult to get rid of). After I renamed the autostart folder, I was able
> to remove the virbr0 interface and iptable rules, but the eth1 can't be
> brought up successfully as described in the opening post.
> Thanks,
> Jake

Are you installing libvirt inside the VMs and running libvirtd? Why
are you doing that?

Matthias

No. I am running libvirt with its Python-bindings on a Ubuntu PC, and remotely creating VMs on ESX server. Since I am creating VMs on ESX server, I don't really need libvirtd. It would be nice if I can disable libvirtd before it's being installed on VMs. 

Thanks so much for your help,

Jake

> On Tue, Mar 8, 2011 at 6:31 AM, Cole Robinson <crobinso redhat com> wrote:
>>
>> On 03/07/2011 04:32 PM, Jake Xu wrote:
>> > Hi all,
>> >
>> > Recently, I have been using libvirt to create virtual machines on ESX
>> > servers. It has been very well until to the point where I couldn't find
>> > any
>> > way to disable/remove the virbr0 interface properly.
>> >
>> > We use static configuration for VMs on ESX so we do not need to use
>> > virbr0
>> > interface and we do not want libvirt to configure iptables as a result
>> > of
>> > the newly created virbr0 interface.
>> >
>> > I have tried to remove/rename the
>> > /etc/libvirt/qemu/networks/autostart.xml
>> > file, and that prevents virbr0 being installed.
>> >
>>
>> Here is how to properly remove steps virbr0 (the default virtual network):
>>
>>
>> http://wiki.libvirt.org/page/FAQ#How_can_I_make_libvirt_stop_using_iptables.3F
>>
>> > However, that also seems to prevent the second interface eth1 being
>> > configured properly. After libvirt defines a VM, eth0 and eht1 are both
>> > installed, but only eth0 is configured properly.
>> >
>> > The eth1 does not appear in the /etc/sysconfig/network-script/ifcfg-xxx
>> > file. It seems to me that the 'autostart.xml' file interrupts the
>> > configuration of the eth1 interface.
>> >
>>
>> Not sure why autostarting a virtual network would also bring up eth1, so
>> no ideas there.
>>
>> - Cole
>
>
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