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[Ihar Hrachyshka <1663458@xxxxxxxxxxxxxxxxxx>]

The agent now reduces timeout for RPC requests. It doesn't affect
existing requests, and so there is still an issue, but that should be
(first) solved in oslo.messaging, for which bug 1672836 was reported. We
may revisit how we interrupt RPC communication in the future when we
have support for that in oslo. For now, let's close the bug.

** Changed in: neutron
       Status: In Progress => Fix Released

** Tags removed: needs-attention

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https://bugs.launchpad.net/bugs/1663458

Title:
  brutal stop of ovs-agent doesn't kill ryu controller

Status in neutron:
  Fix Released
Status in tripleo:
  Triaged

Bug description:
  It seems like when we kill neutron-ovs-agent and start it again, the
  ryu controller fails to start because the previous instance (in
  eventlet) is still running.

  (... ovs agent is failing to start and is brutally killed)

  Trying to start the process 5 minutes later:
  INFO neutron.common.config [-] /usr/bin/neutron-openvswitch-agent version 10.0.0.0rc2.dev33
  INFO ryu.base.app_manager [-] loading app neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ovs_ryuapp
  INFO ryu.base.app_manager [-] loading app ryu.app.ofctl.service
  INFO ryu.base.app_manager [-] loading app ryu.controller.ofp_handler
  INFO ryu.base.app_manager [-] instantiating app neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ovs_ryuapp of OVSNeutronAgentRyuApp
  INFO ryu.base.app_manager [-] instantiating app ryu.controller.ofp_handler of OFPHandler
  INFO ryu.base.app_manager [-] instantiating app ryu.app.ofctl.service of OfctlService
  ERROR ryu.lib.hub [-] hub: uncaught exception: Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/ryu/lib/hub.py", line 54, in _launch
      return func(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/ryu/controller/controller.py", line 97, in __call__
      self.ofp_ssl_listen_port)
    File "/usr/lib/python2.7/site-packages/ryu/controller/controller.py", line 120, in server_loop
      datapath_connection_factory)
    File "/usr/lib/python2.7/site-packages/ryu/lib/hub.py", line 117, in __init__
      self.server = eventlet.listen(listen_info)
    File "/usr/lib/python2.7/site-packages/eventlet/convenience.py", line 43, in listen
      sock.bind(addr)
    File "/usr/lib64/python2.7/socket.py", line 224, in meth
      return getattr(self._sock,name)(*args)
  error: [Errno 98] Address already in use
  INFO neutron.agent.ovsdb.native.vlog [-] tcp:127.0.0.1:6640: connecting...
  INFO neutron.agent.ovsdb.native.vlog [-] tcp:127.0.0.1:6640: connected
  INFO neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ovs_bridge [-] Bridge br-int has datapath-ID 0000badb62a6184f
  ERROR neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ofswitch [-] Switch connection timeout

  I haven't figured out yet how the previous instance of ovs agent was
  killed (my theory is that Puppet killed it but I don't have the
  killing code yet, I'll update the bug asap).

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