[libvirt-users] creating a network on existing bridge

[Fırat KÜÇÜK]

Yes it works.

Thanks. You saved my life.

Let me ask something I can't see it in the code:

This is the code that i found:

static int
networkStartNetworkVirtual(virNetworkObjPtr network)
{
     size_t i;
     bool v4present = false, v6present = false;
     virErrorPtr save_err = NULL;
     virNetworkIpDefPtr ipdef;
     virNetworkRouteDefPtr routedef;
     char *macTapIfName = NULL;
     int tapfd = -1;

     /* Check to see if any network IP collides with an existing route */
     if (networkCheckRouteCollision(network->def) < 0)
         return -1;

     /* Create and configure the bridge device */
     if (virNetDevBridgeCreate(network->def->bridge) < 0)
         return -1;
....

It either create device or return -1. So I was hopeless about a solution :)
But your method saved me.


On 08/13/2015 01:18 AM, Laine Stump wrote:
> On 08/12/2015 05:49 PM, Fırat KÜÇÜK wrote:
>> Hello,
>>
>> Simply I want to create a network on an existing bridge.
>> My XML:
>>
>> <network>
>>   <name>nn1</name>
>>   <bridge name="br-nn1" />
>> </network>
>
> I think what you want is this:
>
> <network>
>   <name>nn1</name>
>   <forward mode='bridge'/>
>   <bridge name='br-nn1'/>
> </network>
>
> https://libvirt.org/formatnetwork.html#examplesBridge
>
> (Originally a network with no <forward> element was considered to be a 
> virtual network with bridge created by libvirt but no physical device 
> attached. When support for networks that used an existing bridge was 
> added, we had to maintain backward compatibility, so we decided that 
> the new type of network would be identified by setting <forward 
> mode='bridge'/> on a network that has a bridge name defined.)
>
>
>>
>> when i want to start network I got "File exist" error.
>>
>> error: Failed to start network nn1
>> error: Unable to create bridge br-nn1: File exist
>>
>> I could define on older releases but now I can't.
>> Ubuntu 15.04 / libvirt version: 1.2.12
>
> No, that wouldn't have worked in any older release of libvirt. Perhaps 
> you've forgotten that you previously had <forward mode='bridge'/> in 
> your definition?
>
>
>>
>> virsh version:
>> Compiled against library: libvirt 1.2.12
>> Using library: libvirt 1.2.12
>> Using API: QEMU 1.2.12
>> Running hypervisor: QEMU 2.2.0
>>
>> Is there any way to activate network?
>>
>> Regards.
>>
>>
>>
>> _______________________________________________
>> libvirt-users mailing list
>> libvirt-users at redhat.com
>> https://www.redhat.com/mailman/listinfo/libvirt-users
>

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