Issue the following command on the controller node to install the LBaaS agent and its dependencies, including HAProxy:
# apt-get install neutron-lbaas-agent
Like the previously installed agents, the Neutron LBaaS agent must be configured to use an interface driver that corresponds to the chosen networking driver. In this configuration, there are two options:
Update the Neutron LBaaS agent configuration file node at
/etc/neutron/lbaas_agent.ini on the controller to use one of the following drivers.
[DEFAULT] ... interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver