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[Bug 1648242] Re: [SRU] Failure to retry update_ha_routers_states

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This bug was fixed in the package neutron - 2:8.4.0-0ubuntu2

---------------
neutron (2:8.4.0-0ubuntu2) xenial; urgency=medium

  [ Edward Hope-Morley ]
  * Backport fix for Failure to retry update_ha_routers_states (LP: #1648242)
    - d/p/add-check-for-ha-state.patch

  [ Chuck Short ]
  * d/neutron-common.install, d/neutron-dhcp-agent.install:
    Remove cron jobs since they will cause a race when
    using an L3 agent. The L3 agent cleans up after itself now.
    (LP: #1623664)

 -- Chuck Short <zulcss@xxxxxxxxxx>  Wed, 19 Apr 2017 11:39:09 +0100

** Changed in: neutron (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1648242

Title:
  [SRU] Failure to retry update_ha_routers_states

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Xenial:
  Fix Released

Bug description:
  [Impact]

    Mitigates risk of incorrect ha_state reported by l3-agent for HA
    routers in case where rmq connection is lost during update
    window. Fix is already in Ubuntu for O and N but upstream
    backport just missed the Mitaka PR hence this SRU.

  [Test Case]

    * deploy Openstack Mitaka (Xenial) with l3-ha enabled and min/max l3
  -agents-per-router set to 3

    * configure network, router, boot instance with floating ip and
  start pinging

    * check that status is 1 agent showing active and 2 showing standby

    * trigger some router failovers while rabbit server stopped e.g.

      - go to l3-agent hosting your router and do:

        ip netns exec qrouter-${router} ip link set dev <ha-iface> down

        check other units to see if ha iface has been failed over

        ip netns exec qrouter-${router} ip link set dev <ha-iface> up
     
    * ensure ping still running

    * eventually all agents will be xxx/standby

    * start rabbit server

    * wait for correct ha_state to be set (takes a few seconds)

  [Regression Potential]

   I do not envisage any regression from this patch. One potential side-effect is
   mildy increased rmq traffic but should be negligible.

  
  --------

  Version: Mitaka

  While performing failover testing of L3 HA routers, we've discovered
  an issue with regards to the failure of an agent to report its state.

  In this scenario, we have a router (7629f5d7-b205-4af5-8e0e-
  a3c4d15e7677) scheduled to (3) L3 agents:

  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+
  | id                                   | host                                             | admin_state_up | alive | ha_state |
  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+
  | 4434f999-51d0-4bbb-843c-5430255d5c64 | 726404-infra03-neutron-agents-container-a8bb0b1f | True           | :-)   | active  |
  | 710e7768-df47-4bfe-917f-ca35c138209a | 726402-infra01-neutron-agents-container-fc937477 | True           | :-)   | standby   |
  | 7f0888ba-1e8a-4a36-8394-6448b8c606fb | 726403-infra02-neutron-agents-container-0338af5a | True           | :-)   | standby   |
  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+

  The infra03 node was shut down completely and abruptly. The router
  transitioned to master on infra02 as indicated in these log messages:

  2016-12-06 16:15:06.457 18450 INFO neutron.agent.linux.interface [-] Device qg-d48918fa-eb already exists
  2016-12-07 15:16:51.145 18450 INFO neutron.agent.l3.ha [-] Router c8b5d5b7-ab57-4f56-9838-0900dc304af6 transitioned to master
  2016-12-07 15:16:51.811 18450 INFO eventlet.wsgi.server [-] <local> - - [07/Dec/2016 15:16:51] "GET / HTTP/1.1" 200 115 0.666464
  2016-12-07 15:18:29.167 18450 INFO neutron.agent.l3.ha [-] Router c8b5d5b7-ab57-4f56-9838-0900dc304af6 transitioned to backup
  2016-12-07 15:18:29.229 18450 INFO eventlet.wsgi.server [-] <local> - - [07/Dec/2016 15:18:29] "GET / HTTP/1.1" 200 115 0.062110
  2016-12-07 15:21:48.870 18450 INFO neutron.agent.l3.ha [-] Router 7629f5d7-b205-4af5-8e0e-a3c4d15e7677 transitioned to master
  2016-12-07 15:21:49.537 18450 INFO eventlet.wsgi.server [-] <local> - - [07/Dec/2016 15:21:49] "GET / HTTP/1.1" 200 115 0.667920
  2016-12-07 15:22:08.796 18450 INFO neutron.agent.l3.ha [-] Router 4676e7a5-279c-4114-8674-209f7fd5ab1a transitioned to master
  2016-12-07 15:22:09.515 18450 INFO eventlet.wsgi.server [-] <local> - - [07/Dec/2016 15:22:09] "GET / HTTP/1.1" 200 115 0.719848

  Traffic to/from VMs through the new master router functioned as
  expected. However, the ha_state remained 'standby':

  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+
  | id                                   | host                                             | admin_state_up | alive | ha_state |
  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+
  | 4434f999-51d0-4bbb-843c-5430255d5c64 | 726404-infra03-neutron-agents-container-a8bb0b1f | True           | xxx   | standby  |
  | 710e7768-df47-4bfe-917f-ca35c138209a | 726402-infra01-neutron-agents-container-fc937477 | True           | :-)   | standby   |
  | 7f0888ba-1e8a-4a36-8394-6448b8c606fb | 726403-infra02-neutron-agents-container-0338af5a | True           | :-)   | standby   |
  +--------------------------------------+--------------------------------------------------+----------------+-------+----------+

  A traceback was observed in the logs related to a message timeout,
  probably due to the cut of AMQP on infra03:

  2016-12-07 15:22:30.525 18450 ERROR oslo.messaging._drivers.impl_rabbit [-] AMQP server on 172.29.237.155:5671 is unreachable: timed out. Trying again in 1 seconds.
  2016-12-07 15:22:36.537 18450 ERROR oslo.messaging._drivers.impl_rabbit [-] AMQP server on 172.29.237.155:5671 is unreachable: timed out. Trying again in 1 seconds.
  2016-12-07 15:22:37.553 18450 INFO oslo.messaging._drivers.impl_rabbit [-] Reconnected to AMQP server on 172.29.238.65:5671 via [amqp] client
  2016-12-07 15:22:51.210 18450 ERROR oslo.messaging._drivers.impl_rabbit [-] AMQP server on 172.29.237.246:5671 is unreachable: Basic.cancel: (0) 1. Trying again in 1 seconds.
  2016-12-07 15:22:52.262 18450 INFO oslo.messaging._drivers.impl_rabbit [-] Reconnected to AMQP server on 172.29.237.246:5671 via [amqp] client
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent [-] Failed reporting state!
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent Traceback (most recent call last):
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/neutron/agent/l3/agent.py", line 686, in _report_state
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     True)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/neutron/agent/rpc.py", line 87, in report_state
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     return method(context, 'report_state', **kwargs)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/rpc/client.py", line 158, in call
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     retry=self.retry)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/transport.py", line 90, in _send
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     timeout=timeout, retry=retry)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 470, in send
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     retry=retry)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 459, in _send
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     result = self._waiter.wait(msg_id, timeout)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 342, in wait
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     message = self.waiters.get(msg_id, timeout=timeout)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent   File "/openstack/venvs/neutron-13.3.9/lib/python2.7/site-packages/oslo_messaging/_drivers/amqpdriver.py", line 244, in get
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent     'to message ID %s' % msg_id)
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent MessagingTimeout: Timed out waiting for a reply to message ID 03e3909c25d749908652c050eeeaec91
  2016-12-07 15:22:55.827 18450 ERROR neutron.agent.l3.agent
  2016-12-07 15:22:55.829 18450 WARNING oslo.service.loopingcall [-] Function 'neutron.agent.l3.agent.L3NATAgentWithStateReport._report_state' run outlasted interval by 0.01 sec
  2016-12-07 15:23:01.086 18450 INFO oslo_messaging._drivers.amqpdriver [-] No calling threads waiting for msg_id : 03e3909c25d749908652c050eeeaec91
  2016-12-07 15:23:45.180 18450 ERROR neutron.common.rpc [-] Timeout in RPC method update_ha_routers_states. Waiting for 4 seconds before next attempt. If the server is not down, consider increasing the rpc_response_timeout option as Neutron server(s) may be overloaded and unable to respond quickly enough.
  2016-12-07 15:23:45.181 18450 WARNING neutron.common.rpc [-] Increasing timeout for update_ha_routers_states calls to 120 seconds. Restart the agent to restore it to the default value.
  2016-12-07 15:23:51.941 18450 ERROR neutron.common.rpc [-] Timeout in RPC method update_ha_routers_states. Waiting for 35 seconds before next attempt. If the server is not down, consider increasing the rpc_response_timeout option as Neutron server(s) may be overloaded and unable to respond quickly enough.

  While subsequent transitions for other routers acted and updated
  Neutron accordingly, this router's ha_state was never updated after
  this initial failure. We could force the update with a restart of the
  L3 agent, or by causing a transition from infra02 to another node, and
  back. Neither is ideal.

  If you need any other information please let me know.

  Thanks,
  James

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