Open Stack

Hi,


I'm trying to understand how LBaaS drivers work and so am attempting to
write a dummy driver that does nothing for now, but instead of loading my
dummy driver, neutron always loads the HAProxy namespace driver. These are
the steps I followed:


1) I created a new directory neutron/services/loadbalancer/drivers/dummy/,
and in that directory I put in a new file dummy_driver.py, which basically
has a class class
DummyPluginDriver(abstract_driver.LoadBalancerAbstractDriver):

and has empty __init__(), create_vip(), delete_vip() etc functions.


2) I'm testing using a devstack setup, so I also edited the
/etc/neutron/neutron.conf file, commenting out the default loadbalancer
driver entry for HAProxy, and added a line for my dummy driver as follows:


service_provider=LOADBALANCER:Dummy:neutron.services.loadbalancer.drivers.dummy.dummy_driver.DummyPluginDriver:default



3) I created a /etc/neutron/services/loadbalancer/dummy/lbaas_agent.ini
directory/file

I simply copied over the haproxy's lbaas_agent.ini file and changed
[haproxy] to [dummy]

and then I restarted the q-lbaas service using cd /opt/stack/neutron &&
python /usr/local/bin/neutron-lbaas-agent --config-file
/etc/neutron/neutron.conf
--config-file=/etc/neutron/services/loadbalancer/dummy/lbaas_agent.ini



However, I see that the default HAProxyNS driver is still being loaded

When I put a breakpoint in loadbalancer/agent/agent_manager.py:86, I see
this (relevant text marked in red):



2014-03-31 13:47:16.998 DEBUG neutron.common.utils [-] Reloading cached
file /etc/neutron/policy.json from (pid=28405) read_cached_file
/opt/stack/neutron/neutron/common/utils.py:53

2014-03-31 13:47:16.998 DEBUG neutron.policy [-] Loading policies from
file: /etc/neutron/policy.json from (pid=28405) _set_rules
/opt/stack/neutron/neutron/policy.py:89

>
/opt/stack/neutron/neutron/services/loadbalancer/agent/agent_manager.py(86)_load_drivers()

-> self.device_drivers = {}

(Pdb) l

 81             # pool_id->device_driver_name mapping used to store known
instances

 82             self.instance_mapping = {}

 83

 84         def _load_drivers(self):

 85             import pdb; pdb.set_trace()

 86  ->         self.device_drivers = {}

 87             for driver in self.conf.device_driver:

 88                 try:

 89                     driver_inst = importutils.import_object(

 90                         driver,

 91                         self.conf,

(Pdb) self.conf.device_driver

['neutron.services.loadbalancer.drivers.haproxy.namespace_driver.HaproxyNSDriver']

(Pdb)


I'm not sure what I'm doing wrong - am I missing something that needs to be
done within the dummy driver itself? (in dummy_driver.py?). Should I
register some opts or similar?


Any help would be much appreciated!



Thanks,

Regards,

Vijay
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