[openstack-dev] [Neutron] initial OVN testing

George Shuklin george.shuklin at gmail.com
Tue Mar 31 17:09:28 UTC 2015

If that thing will have worked,  I'll owe you a beer. Every time I debug 
OVS-neutron issues I want to cry. All that constant 'exec ovs-vsctl' 
stuff driving me mad because of the underengineering and overall 

I will definitively try it on 'reallife lab installation' with few 
compute hosts.

On 03/27/2015 01:54 AM, Russell Bryant wrote:
> Gary and Kyle, I saw in my IRC backlog that you guys were briefly
> talking about testing the Neutron ovn ml2 driver.  I suppose it's time
> to add some more code to the devstack integration to install the current
> ovn branch and set up ovsdb-server to serve up the right database for
> this.  I'll try to work on that tomorrow.  Of course, note that all we
> can set up right now is the northbound database.  None of the code that
> reacts to updates to that database is merged yet.  We can still go ahead
> and test our code and make sure the expected data makes it there, though.
> Here's some more detail about the pieces ...
> When I was writing ovn-nbctl [1], I was testing using ovs-sandbox.  It's
> a script that sets up a handy development environment for ovs.  It has
> ovn support if you pass the "-o" option [2].  To run it, it would be
> something like ...
>    $ git clone https://github.com/openvswitch/ovs.git
>    $ cd ovs
>    $ git checkout ovn
>    $ ./boot.sh
>    $ ./configure
>    $ make
>    $ make SANDBOXFLAGS="-o" sandbox
>  From there you can run ovn-nbctl.  Here's a script to demonstrate the
> various commands:
>    https://gist.github.com/russellb/946953e8675063c0c756
> To set this up outside of ovs-sandbox, you need to first create the OVN
> northbound database:
>    $ ovsdb-tool create ovnnb.db ovs-git-tree/ovn/ovn-nb.ovsschema
> Then you need to tell ovsdb-server to use it.  By default ovsdb-server
> will only serve up conf.db.  It can take a list of dbs as positional
> arguments, though.  You can see that's what the ovs-sandbox script is doing.
> So, you can either change the command used to start ovsdb-server on your
> system, or start up another instance of it with its own unix socket and
> tcp port.
> There was also a question on IRC about the format of the database option
> for the ML2 driver.  The value is passed directly to ovn-nbctl.  The
> format is the same as is used for ovs-vsctl (and probably others).
> When running in ovs-sandbox, ovn-nbctl's help output shows:
>    --db=DATABASE             connect to DATABASE
>                              (default:
> unix:/home/rbryant/src/ovs/tutorial/sandbox/db.sock)
> and further down, it provides some more detail:
>    Active database connection methods:
>      tcp:IP:PORT             PORT at remote IP
>      ssl:IP:PORT             SSL PORT at remote IP
>      unix:FILE               Unix domain socket named FILE
>    Passive database connection methods:
>      ptcp:PORT[:IP]          listen to TCP PORT on IP
>      pssl:PORT[:IP]          listen for SSL on PORT on IP
>      punix:FILE              listen on Unix domain socket FILE
> [1] http://openvswitch.org/pipermail/dev/2015-March/052757.html
> [2] http://openvswitch.org/pipermail/dev/2015-March/052353.html

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