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[Launchpad Bug Tracker <1531245@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1531245

Title:
  neutron.agent.linux.ovsdb_monitor errors, agent fails to add 1Q tag to
  new interfaces

Status in neutron:
  Expired

Bug description:
  Version: Liberty
  Compute hypervisor: XenServer 6.5SP1
  Compute vm: Ubuntu 14.04.3

  This issue appears first in liberty--and not before--when running
  XenServer 6.5SP1 hypervisor. In this environment, root-helper is set
  to /usr/bin/neutron-rootwrap-xen-dom0, which executes commands in the
  hypervisor's Dom0 context. This problem keeps the neutron-openvswitch-
  agent from verifying that the ovsdb-client is currently executing.
  Additionally, the XMLRPC interface design for communicating to DOM0
  does not work with ``streaming'' data pipelines.

  The error message is reported every couple seconds:
  2016-01-05 10:16:25.255 1728 ERROR neutron.agent.linux.ovsdb_monitor [req-8037e215-c9d3-4593-b0d8-a0fc1bba6c7d - - - - -] Interface monitor is not active
  2016-01-05 10:16:27.295 1728 ERROR neutron.agent.linux.ovsdb_monitor [req-8037e215-c9d3-4593-b0d8-a0fc1bba6c7d - - - - -] Interface monitor is not active
  2016-01-05 10:16:29.249 1728 ERROR neutron.agent.linux.ovsdb_monitor [req-8037e215-c9d3-4593-b0d8-a0fc1bba6c7d - - - - -] Interface monitor is not active

  The cause of the problem is that AsyncProcess.pid is None and
  AsyncProcess.is_active returns false when root_helper runs commands in
  another system context.  Consequently, the command is respawned every
  ovsdb_monitor_respawn_interval seconds.

  The new behaviour began with commit
  3543d8858691c1a709127e25fc0838e054bd34ef.

  Furthermore, the introduced changes no longer works with the
  communication pattern of neutron-rootwrap-xen-dom0. This is an XML rpc
  style interfaces that supports request/response-style communication.

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