Steps to configure Neutron LBaaS Agent for OpenStack

Install the Neutron LBaaS Agent and HAProxy
# yum -y install haproxy neutron-lbaas-agent

For LBaaS to be configured properly, various configuration files must have the following changes.

# vi /usr/share/neutron/neutron-dist.conf:

service_provider = LOADBALANCER:Haproxy:neutron.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver:default

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# vi /etc/neutron/neutron.conf

service_plugins = neutron.services.loadbalancer.plugin.LoadBalancerPlugin

# vi /etc/neutron/lbaas_agent.ini

device_driver = neutron.services.loadbalancer.drivers.haproxy.namespace_driver.HaproxyNSDriver

interface_driver = neutron.agent.linux.interface.OVSInterfaceDriver

user_group = nobody

# vi /etc/openstack-dashboard/local_settings 

OPENSTACK_NEUTRON_NETWORK = {‘enable_lb’: True,

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Comment service_provider from the file /usr/share/neutron/neutron-dist.conf to avoid the following error in server.log:
TRACE neutron.service Invalid: Driver neutron.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver is not unique across providers

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If the above configuration files were changed manually, restart the neutron-server service and neutron-lbaas-agent service.
Also, restart the httpd service.

# service httpd restart
# service neutron-server restart
# service neutron-lbaas-agent start
# chkconfig –level 345 neutron-lbaas-agent on