[openstack-dev] [neutron][oslo]neutron agent not receiving callback

Assaf Muller assaf at redhat.com
Wed Mar 9 16:14:16 UTC 2016

On Wed, Mar 9, 2016 at 9:40 AM, Ihar Hrachyshka <ihrachys at redhat.com> wrote:
> Vikash Kumar <vikash.kumar at oneconvergence.com> wrote:
>> On Wed, Mar 9, 2016 at 3:42 PM, Vikash Kumar
>> <vikash.kumar at oneconvergence.com> wrote:
>> I have written a sample neutron agent which subscribe for the AFTER_CREATE
>> event of router. I have defined a sample method as callback, but the method
>> doesn't gets called anytime.
>> Also, in logs:
>> 2016-03-09 01:36:08.220 7075 DEBUG neutron.callbacks.manager [-]
>> Subscribe: <function add_router at 0x7fdbbc482ed8> router after_create
>> subscribe /opt/stack/neutron/neutron/callbacks/manager.py:41
>>     which means the subscription is successful.
>>    Do I need to enable anything in config file to get that ? Or am I
>> missing something ?
> First, nothing oslo specific is discussed here, so [oslo] tag is probably
> redundant.
> Overall, I believe you try to rely on wrong thing that won’t deliver for
> you: callbacks are internal to neutron-server, so events triggered by
> neutron-servers will never reach any other processes (like your agent).

The same callbacks mechanism is also used in the L3 agent, but as Ihar
said, events in one process (neutron-server) will not trigger
callbacks in another process (l3-agent). If that's what you want,
you'll need RPC.

> More info: http://docs.openstack.org/developer/neutron/devref/callbacks.html
> Ihar
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