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[huan <huan.xie@xxxxxxxxxx>]

Public bug reported:

My environment is XenServer + Neutron with ML2 plugin, OVS as driver, VLan type.
This is a single box environment installed by devstack.
When it began to run, I found q-agt always had error logs like this:

2015-09-09 05:15:23.653 ERROR neutron.agent.linux.ovsdb_monitor [req-
2dfc6939-277b-4d54-83d5-d0aecbfdc07c None None] Interface monitor is not
active

Dig deep into the code, I found the callstack is trace from
OVSNeutronAgent.rpc_loop() to neutron/agent/linux/utils.py
remove_abs_path(). So I temporarily added debug log and found

2015-09-09 05:15:23.653 DEBUG neutron.agent.linux.utils [req-2dfc6939-277b-4d54-83d5-d0aecbfdc07c None None] cmd_matches_expected, cmd:['/usr/bin/python', '/usr/local/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovsdb-client', 'monitor', 'Interface', 'name,ofport,external_ids', '--format=json'], expect:['ovsdb-client', 'monitor', 'Interface', 'name,ofport,external_ids', '--format=json'] from (pid=11595) cmd_matches_expected /opt/stack/neutron/neutron/agent/linux/utils.py:303
 
So, it's clear that after remove absolute path, the command still cannot match, so it will lead to the ERROR log of "Interface monitor is not active"

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1493662

Title:
  ovs-agent-plugin polling manager fails to monitor interface table

Status in neutron:
  New

Bug description:
  My environment is XenServer + Neutron with ML2 plugin, OVS as driver, VLan type.
  This is a single box environment installed by devstack.
  When it began to run, I found q-agt always had error logs like this:

  2015-09-09 05:15:23.653 ERROR neutron.agent.linux.ovsdb_monitor [req-
  2dfc6939-277b-4d54-83d5-d0aecbfdc07c None None] Interface monitor is
  not active

  Dig deep into the code, I found the callstack is trace from
  OVSNeutronAgent.rpc_loop() to neutron/agent/linux/utils.py
  remove_abs_path(). So I temporarily added debug log and found

  2015-09-09 05:15:23.653 DEBUG neutron.agent.linux.utils [req-2dfc6939-277b-4d54-83d5-d0aecbfdc07c None None] cmd_matches_expected, cmd:['/usr/bin/python', '/usr/local/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovsdb-client', 'monitor', 'Interface', 'name,ofport,external_ids', '--format=json'], expect:['ovsdb-client', 'monitor', 'Interface', 'name,ofport,external_ids', '--format=json'] from (pid=11595) cmd_matches_expected /opt/stack/neutron/neutron/agent/linux/utils.py:303
   
  So, it's clear that after remove absolute path, the command still cannot match, so it will lead to the ERROR log of "Interface monitor is not active"

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