Have a look here:
http://git.openstack.org/cgit/openstack/neutron-lbaas/tree/neutron_lbaas/drivers

Thanks,
Kevin
________________________________
From: Wanjing Xu [wanjing...@hotmail.com]
Sent: Monday, June 01, 2015 4:52 PM
To: OpenStack Development Mailing List not for usage questions
Subject: [openstack-dev] [Neutron][LBaaS] No LBaaS agent?

Is there a way to add an LBaaS service without having to use neutron 
plugin/agent framework?

I want to add a LBaaS service without  an LBaaS agent running and still want to 
have lb cli and horizon.  When the user configure loadbalance via cli or 
horizon, neutron will send the events(pool, member, vip create/delete event)in 
the notification info queue and our application will listen to the queue and 
program  the LBaaS box.  So far, I have tried to enable the built-in HAProxy 
LBaaS(enable the service_plugin to be LoadBalancerPlugin and service provider 
to be haproxy).  By doing that , horizon and cli are all enabled and our 
application can successfully program LBaaS box using the notification events.  
The problem with that is that there is a haproxy agent running in the 
background although we are not using its function.  But if I don't enable the 
agent, we can not use horizon.  Currently we don't want to write a LBaaS agent 
of our own.  Is there a way to not to use LBaaS agent and still  be able to use 
horizon/cli to configure loadbalance?  During openstack summit at vancouver, I 
saw paypal loadbalance presentation, they use two providers, one is agent , the 
other is agentless controller, not sure how that controller works, could not 
find it through googling.

Regards
Wanjing Xu


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