[Bug 1864822] Re: Openvswitch Agent - Connexion openvswitch DB Broken

[Edward Hope-Morley]

All SRU verification completed and performed in
https://bugs.launchpad.net/neutron/+bug/1869808 so please refer to that
LP for the results.

** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic

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https://bugs.launchpad.net/bugs/1864822

Title:
  Openvswitch Agent - Connexion openvswitch DB Broken

Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Incomplete
Status in neutron source package in Bionic:
  Fix Committed

Bug description:
  (For SRU template, please see bug 1869808, as the SRU info there
  applies to this bug also)

  Hi all,

  We have deployed more OpenStack plateform in my company.
  We used kolla ansible to deploy our plateforms.
  Here is the configuration that we applied :
  kolla_base_distro: "centos"
  kolla_install_type : "binary"
  openstack_version : "stein"

  Neutron architecture :
  HA l3 enable
  DVR enable
  SNAT Enabled
  multiple vlan provider : True

  Note: Our plateforms are multi-region

  Recently, we have upgraded a master region from rocky to stein with kolla ansible upgrade procedure.
  Since ugrade, sometimes openvswitch agent lost connexion to ovsdb.
  We have found this error in neutron-openvswitch-agent.log : "tcp:127.0.0.1:6640: send error: Broken pipe".
  And we have found this errors in ovsdb-server.log :
  2020-02-24T23:13:22.644Z|00009|reconnect|ERR|tcp:127.0.0.1:50260: no response to inactivity probe after 5 seconds, disconnecting
  2020-02-25T04:10:55.893Z|00010|reconnect|ERR|tcp:127.0.0.1:58544: no response to inactivity probe after 5 seconds, disconnecting
  2020-02-25T07:21:12.301Z|00011|reconnect|ERR|tcp:127.0.0.1:34918: no response to inactivity probe after 5 seconds, disconnecting
  2020-02-25T09:21:45.533Z|00012|reconnect|ERR|tcp:127.0.0.1:37782: no response to inactivity probe after 5 seconds, disconnecting

  When we experience this issue, all "NORMAL" type flows inside br-ex doesn't get out.
  Example of flows stuck:
  (neutron-openvswitch-agent)[root at cnp69s12p07 /]# ovs-ofctl dump-flows br-ex | grep NORMAL
   cookie=0x7adbd675f988912b, duration=72705.077s, table=0, n_packets=185, n_bytes=16024, idle_age=65534, hard_age=65534, priority=0 actions=NORMAL
   cookie=0x7adbd675f988912b, duration=72695.007s, table=2, n_packets=11835702, n_bytes=5166123797, idle_age=0, hard_age=65534, priority=4,in_port=5,dl_vlan=1 actions=mod_vlan_vid:12,NORMAL
   cookie=0x7adbd675f988912b, duration=72694.928s, table=2, n_packets=4133243, n_bytes=349654412, idle_age=0, hard_age=65534, priority=4,in_port=5,dl_vlan=9 actions=mod_vlan_vid:18,NORMAL

  Workaround to solve this issue:
  - stop openvswitch_db openvswitch_vswitchd neutron_openvswitch_agent neutron_l3_agent (containers)
  - start containers:  openvswitch_db openvswitch_vswitchd
  - start neutron_l3_agent neutron_openvswitch_agent

  Note: we have keep ovs connection timeout options by default :
  - of_connect_timeout: 300
  - of_request_timeout: 300
  - of_inactivity_probe: 10

  Thank you in advance for your help.

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