[Bug 1722946] Re: openvswitch flows not fully restored after openvswitch-switch upgrade

[James Page]

Worth noting that the deployment uses the l2-population driver;
disabling and trying to reproduce without that

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https://bugs.launchpad.net/bugs/1722946

Title:
  openvswitch flows not fully restored after openvswitch-switch upgrade

Status in Ubuntu Cloud Archive:
  New
Status in neutron:
  New
Status in neutron package in Ubuntu:
  New

Bug description:
  In previous releases, an upgrade to the openvswitch packages which
  results in a restart of the userspace daemons is detected by the
  neutron-openvswitch-agent, which then tidies and restores the required
  state resulting in a minimal outage to instances on the hypervisor
  being upgrades.

  Whilst testing updates to ovs 2.8.1, I noted that instance
  connectivity dropped but was never restored;  restarting the neutron-
  openvswitch-agent resolved the issue.

  2017-10-11 22:12:43.481 28598 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: send error: Connection refused
  2017-10-11 22:12:43.482 28598 WARNING ovsdbapp.backend.ovs_idl.vlog [-] tcp:127.0.0.1:6640: connection dropped (Connection refused)
  2017-10-11 22:12:45.332 28598 WARNING neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] OVS is restarted. OVSNeutronAgent will reset bridges and recover ports.
  2017-10-11 22:12:45.647 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Mapping physical network physnet1 to bridge br-data
  2017-10-11 22:12:45.700 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.openflow.native.ovs_bridge [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Bridge br-data has datapath-ID 00003e24776a3b44
  2017-10-11 22:12:45.886 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Port b08484e1-5e7d-45e9-86d8-7078ded39d9f updated. Details: {'profile': {}, 'network_qos_policy_id': None, 'qos_policy_id': None, 'allowed_address_pairs': [], 'admin_state_up': True, 'network_id': 'f1b6715f-9d79-457f-8272-6b54d0f82332', 'segmentation_id': 5, 'fixed_ips': [{'subnet_id': 'b069aeff-8879-4007-9799-bd350c3d1e5c', 'ip_address': '192.168.21.3'}], 'device_owner': u'compute:nova', 'physical_network': None, 'mac_address': 'fa:16:3e:69:89:92', 'device': u'b08484e1-5e7d-45e9-86d8-7078ded39d9f', 'port_security_enabled': True, 'port_id': 'b08484e1-5e7d-45e9-86d8-7078ded39d9f', 'network_type': u'gre', 'security_groups': ['84afead6-fcc4-45f7-94f1-017f263ca080']}
  2017-10-11 22:12:45.887 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Assigning 1 as local vlan for net-id=f1b6715f-9d79-457f-8272-6b54d0f82332
  2017-10-11 22:12:45.892 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Port 8aedca8c-fd85-42f0-97fa-eacb43a3364b updated. Details: {'profile': {}, 'network_qos_policy_id': None, 'qos_policy_id': None, 'allowed_address_pairs': [], 'admin_state_up': True, 'network_id': 'f1b6715f-9d79-457f-8272-6b54d0f82332', 'segmentation_id': 5, 'fixed_ips': [{'subnet_id': 'b069aeff-8879-4007-9799-bd350c3d1e5c', 'ip_address': '192.168.21.10'}], 'device_owner': u'compute:nova', 'physical_network': None, 'mac_address': 'fa:16:3e:50:b7:1a', 'device': u'8aedca8c-fd85-42f0-97fa-eacb43a3364b', 'port_security_enabled': True, 'port_id': '8aedca8c-fd85-42f0-97fa-eacb43a3364b', 'network_type': u'gre', 'security_groups': ['84afead6-fcc4-45f7-94f1-017f263ca080']}
  2017-10-11 22:12:45.893 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Assigning 1 as local vlan for net-id=f1b6715f-9d79-457f-8272-6b54d0f82332
  2017-10-11 22:12:45.902 28598 INFO neutron.agent.securitygroups_rpc [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Preparing filters for devices set([u'b08484e1-5e7d-45e9-86d8-7078ded39d9f', u'8aedca8c-fd85-42f0-97fa-eacb43a3364b'])
  2017-10-11 22:12:47.813 28598 INFO neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-d616236d-5a5f-4f55-a721-83ff5079e5f0 - - - - -] Configuration for devices up [u'b08484e1-5e7d-45e9-86d8-7078ded39d9f', u'8aedca8c-fd85-42f0-97fa-eacb43a3364b'] and devices down [] completed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: neutron-openvswitch-agent 2:11.0.1-0ubuntu1~cloud0 [origin: Canonical]
  ProcVersionSignature: Ubuntu 4.4.0-96.119-generic 4.4.83
  Uname: Linux 4.4.0-96-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CrashDB:
   {
                  "impl": "launchpad",
                  "project": "cloud-archive",
                  "bug_pattern_url": "http://people.canonical.com/~ubuntu-archive/bugpatterns/bugpatterns.xml",
               }
  Date: Wed Oct 11 22:17:32 2017
  Ec2AMI: ami-0000022c
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.medium
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  ProcEnviron:
   TERM=screen-256color-bce
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: neutron
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.neutron.plugins.ml2.openvswitch_agent.ini: 2017-10-11T19:36:21.675410

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