[rhos-list] Bridge names in Openstack quantum

[Robert Kukura]

On 01/17/2013 07:24 AM, Kumar Vaibhav wrote:
> Hi,
> 
> I am having problem in using the Quantum in on a single flat network.
> 
> I am using it in Linux bridge mode.
> My compute node is having only one network. On which I pre created a
> bridge br10.
> 
> When I instantiated a machine I compute node become inaccesible. I
> checked the logs and found that it has changed my bridge configuration.
> 
> It has created a new bridge. with name of br<12 characters of Network
> ID> This seems to be little cryptic in identification.
> 
> Is there any way I can define the existing Bridge name to be used for a
> particular Network ID?
> Currently Quantum checks if the Bridge exists it just creates a TUN device.
> So If I pre create the Bridge then it will not change it
> 
> Regards
> Vaibhav

Hi,

The linuxbridge agent's current behavior is to create and manage the
bridges itself, based on physical interface names obtained from the
physical_interface_mappings configuration variable. If possible, you
should let the agent take care of creating the bridge. It will move any
IP address the host has on the interface to the bridge, so connectivity
should not be lost.

But I do agree there are cases where it would make sense for the agent
to use a pre-configured bridge instead. Therefore I've filed
https://bugs.launchpad.net/quantum/+bug/1105488 upstream and
https://bugzilla.redhat.com/show_bug.cgi?id=904274 against the RHOS
product requesting this enhancement. I was not able to add your email
address to the the BZ because it is not registered, so you may want to
do this yourself.

One option to consider would be using the openvswitch plugin, which does
use pre-configured OVS bridges.

-Bob

> 
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