[Bug 1737684] Re: upgrading neutron appended faulty core_plugin option in neutron.conf

[James Page]

I'm not sure where "core_plugin = openvswitch" is coming from; the
packaging sets the core_plugin to ml2 using a patch to the generated
neutron.conf file (using oslo-config-generator).

The way that the files in /etc/neutron are handled by the packaging
means they are treated as dpkg conf files - in the case that something
has been changed post install, and upgrade should by default not write a
new version of the configuration file to disk.

** Changed in: neutron (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1737684

Title:
  upgrading neutron appended faulty core_plugin option in neutron.conf

Status in neutron package in Ubuntu:
  Incomplete

Bug description:
  Upgrading our neutron packages to Ocata, the following:

  Using xenial ocata cloudarchive repo:
  deb http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-updates/ocata main

  ii  neutron-common                      2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - common
  ii  neutron-dhcp-agent                  2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - DHCP agent
  ii  neutron-l3-agent                    2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - l3 agent
  ii  neutron-linuxbridge-agent           2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - linuxbridge agent
  ii  neutron-metadata-agent              2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - metadata agent
  ii  neutron-plugin-ml2                  2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - ML2 plugin
  ii  neutron-server                      2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - server
  ii  python-neutron                      2:10.0.4-0ubuntu1~cloud0                   all          Neutron is a virtual network service for Openstack - Python library
  ii  python-neutron-fwaas                1:9.0.1-0ubuntu1~cloud0                    all          Firewall-as-a-Service driver for OpenStack Neutron
  ii  python-neutron-lib                  1.1.0-0ubuntu1~cloud0                      all          Neutron shared routines and utilities - Python 2.7
  ii  python-neutronclient                1:6.0.0-0ubuntu1~cloud0                    all          client API library for Neutron - Python 2.7

  What happend was that "core_plugin = openvswitch" was appended to
  neutron.conf even though we have core_plugin = ml2 set.

  Removed that line, restarted the agent and everything was fine again.

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