multi api_workers bind port failed

[xiayu]

in conf file: api_workers=4

error log:
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service [req-24844814-509a-415a-a05f-4203fd95f098 - - - - -] Error starting thread.
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service Traceback (most recent call last):
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/oslo_service/service.py", line 708, in run_service
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service service.start()
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/tacker/service.py", line 65, in start
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service self.wsgi_app = _run_wsgi(self.app_name)
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/tacker/service.py", line 111, in _run_wsgi
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service workers=cfg.CONF.api_workers)
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/tacker/wsgi.py", line 216, in start
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service backlog=backlog)
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service File "/usr/lib/python2.7/site-packages/tacker/wsgi.py", line 195, in _get_socket
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service 'time': CONF.retry_until_window})
2016-09-07 05:02:15.497 25228 ERROR oslo_service.service RuntimeError: Could not bind to 0.0.0.0:9890 after trying for 30 seconds

[xiayu (1013230155-v)]

i think this is problem:
in tacker/cmd/server.py
tacker_api = service.serve_wsgi(service.TackerApiService)
launcher = common_service.launch(cfg.CONF, tacker_api,
                                workers=cfg.CONF.api_workers or None)

in tacker/wsgi.py
self._launcher = common_service.ProcessLauncher(CONF,wait_interval=1.0)
self._server = WorkerService(self, application)
self._launcher.launch_service(self._server, workers=workers)

they both launch sevice with multi workers.
if i remove workers in server.py, it will works.
launcher = common_service.launch(cfg.CONF, tacker_api)

[venkatamahesh (venkatamaheshkotha)]

Hi,

Please paste full tacker.log data ?

Thanks
mahesh

[Niraj Singh (nirajsingh)]

Tried to reproduce this bug by modifying api_worker in tacker.conf file.

First checked for api_workers = 4, and got the below workers started successfully:

ps aux | grep tacker
open 1239 0.2 0.9 243328 78568 ? Ss 01:02 0:02 /usr/bin/python /usr/local/bin/tacker-conductor --config-file /etc/tacker/tacker.conf
open 6795 0.0 0.1 107880 8820 pts/5 S+ 01:05 0:00 journalctl -n 10000 -a -f --unit <email address hidden>
root 7438 8.4 0.9 245480 80648 ? Ss 01:19 0:02 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7448 3.9 1.3 296348 113608 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7449 4.0 1.3 296356 113612 ? S 01:19 0:01 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7450 4.1 1.3 296352 113604 ? S 01:19 0:01 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7451 4.0 1.3 296344 113604 ? S 01:19 0:01 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7452 0.1 1.3 297124 111736 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7453 0.1 1.3 297128 111684 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7454 0.1 1.3 297124 111736 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7455 0.1 1.3 297128 111684 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7456 0.1 1.3 297128 111708 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7457 0.1 1.3 297124 111696 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7458 0.1 1.3 297172 111740 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7459 0.2 1.3 297132 111684 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7460 0.1 1.3 297128 111688 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7461 0.1 1.3 297124 111688 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7462 0.1 1.3 297176 111736 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7463 0.1 1.3 297124 111712 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7464 0.1 1.3 297128 111712 ? S 01:19 0:00 /usr/bin/python /usr/local/bin/tacker-server --config-file /etc/tacker/tacker.conf
root 7465 0.1 1.3 297036 111728 ? S 01:19 0:0...