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[Rodolfo Alonso <1624170@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: In Progress => Won't Fix

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https://bugs.launchpad.net/bugs/1624170

Title:
  Iteration for metering fails because metering-agent tried to operate
  chain in namespace of deleted router

Status in neutron:
  Won't Fix

Bug description:
  Metering-agent cannot recognize namespace for router is deleted.
  Thus, metering-agent sometimes fails to operate chain for metering with following trace
  because namespace for router had already deleted, especially when synchronizing information with neutron-server.

  I assume that we should simply catch the error and continue the
  iteration.

  How to reproduce
  =========================
  1. neutron meter-label-create test
  2. neutron meter-label-rule-create <UUID of meter-label in procedure 1.>
  3. neutron router-create test
  4. neutron router-gateway-set <UUID of router in procedure 3.>
  5. Check that iptables chain for the router is generated.
  6. neutron router-delete test
  7. wait a minute.(until next _sync_routers_task is executed.)

  trace in metering-agent.log
  =========================
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent [req-4798393c-417b-4af6-bb16-15c7b8cb4b17 - - - - -] Driver neutron.services.meterin
  g.drivers.iptables.iptables_driver.IptablesMeteringDriver:update_routers runtime error
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent Traceback (most recent call last):
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/services/metering/agents/metering_agent.py", line
   166, in _invoke_driver
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     return getattr(self.metering_driver, func_name)(context, meterings)
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/usr/local/lib/python2.7/dist-packages/oslo_log/helpers.py", line 48, in wra
  pper
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     return method(*args, **kwargs)
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/services/metering/drivers/iptables/iptables_drive
  r.py", line 109, in update_routers
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     self._process_disassociate_metering_label(rm.router)
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/services/metering/drivers/iptables/iptables_drive
  r.py", line 257, in _process_disassociate_metering_label
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     del rm.metering_labels[label_id]
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/services/metering/drivers/iptables/iptables_drive
  r.py", line 58, in __exit__
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     self.im.apply()
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/agent/linux/iptables_manager.py", line 437, in apply
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     return self._apply()
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/agent/linux/iptables_manager.py", line 445, in _apply
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     first = self._apply_synchronized()
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/agent/linux/iptables_manager.py", line 480, in _apply_synchronized
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     save_output = self.execute(args, run_as_root=True)
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent   File "/opt/stack/neutron/neutron/agent/linux/utils.py", line 138, in execute
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent     raise RuntimeError(msg)
  2016-09-16 00:20:35.118 16578 ERROR neutron.services.metering.agents.metering_agent RuntimeError: Exit code: 1; Stdin: ; Stdout: ; Stderr: Cannot open network namespace "qrouter-15e41fb9-44f7-4233-8ff9-12f74f73ade2": No such file or directory
  ==========================

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