Several releases ago, neutron deprecated and removed the monolithic OVS and Linux bridge plug-ins. During the deprecation cycle, the installation guide changed the neutron instructions to use ML2 instead of the monolithic OVS plug-in. However, the defunct configuration files (plugins/openvswitch/ovs_neutron_plugin.ini and plugins/linuxbridge/linuxbridge_conf.ini) lingered until the Liberty release. The combination of migrating to ML2 and referencing configuration files from the monolithic plug-ins (especially OVS with "plugin" in the file name) caused significant confusion with our audience that already struggles with neutron and installations in general. Some distributions and deployment tools moved configuration for the OVS and Linux bridge agents into the ml2_conf.ini file and changed the agent init scripts to read it. At the time, implementing this approach in the installation guide seemed like the best solution until neutron resolved the file name/location problem in Liberty.

On Thu, Nov 5, 2015 at 5:47 AM, Ihar Hrachyshka <ihrachys@redhat.com> wrote:
Markelov Andrey <amarkelov@yandex.ru> wrote:

Thanks for clarification!

No, as I wrote before it is not documented in Liberty,

but Kilo & Juno:

"Due to a packaging bug, the Open vSwitch agent initialization script explicitly looks for the Open vSwitch plug-in configuration file rather than a symbolic link /etc/neutron/plugin.ini pointing to the ML2 plug-in configuration file. Run the following commands to resolve this issue:"

http://docs.openstack.org/kilo/install-guide/install/yum/content/neutron-compute-node.html

 Yeah. So long story short, the text you quoted was always wrong, and they finally fixed it by removing the notion of ‘a packaging bug’ which was never a packaging bug in RDO but a documentation bug in upstream docs.

I am glad to hear it’s not there anymore. That said, I would make sure that they actually have proper instructions on how to configure the agent (using openvswitch_agent.ini). [For linuxbridge, they are correct: http://docs.openstack.org/liberty/install-guide-rdo/neutron-compute-install-option1.html]

Ihar


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