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On Wed, Nov 2, 2016 at 6:48 PM, Murali R <muralirdev at gmail.com> wrote:

> Following the docs online (Newton), the installation was successful.
> However when the VM that has the controller (and ovn-nb) restarted, it
> fails to bring up ovs & ovn. This is ubuntu deployment using
> python-networking-ovn and locally built ovn. Is this a deployment problem?
> Is it possible to recover from here without losing the neutron DB sync? I
> have not configured any networks that I need to save.
>
> NOTE: I did a reboot once before and the services came back fine at that
> time. Not sure if there is a sequence to be followed while shutting down -
> if so can I know what it would be?
>
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn [-] OVS database connection
> to OVN_Northbound failed with error: 'Could not retrieve schema from tcp:
> 192.168.56.102:6641: Connection refused'. Verify that the OVS and OVN
> services are available and that the 'ovn_nb_connection' and
> 'ovn_sb_connection' configuration options are correct.
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn Traceback (most recent call
> last):
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn   File
> "/usr/lib/python2.7/dist-packages/networking_ovn/ovsdb/impl_idl_ovn.py",
> line 84, in __init__
> ....
> ....
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn     'err': os.strerror(err)})
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn Exception: Could not
> retrieve schema from tcp:192.168.56.102:6641: Connection refused
> Nov  2 15:19:42 controller neutron-server[2715]: 2016-11-02 15:19:42.003
> 3052 ERROR networking_ovn.ovsdb.impl_idl_ovn
>

​As you noted, it looks like the OVN services were not started.  If you
installed from source, you should run:

$ sudo /usr/share/openvswitch/scripts/ovn-ctl start_northd

The OVN packages install systemd units, so you can also start it that way
and set it up to re-start after a reboot.

$ sudo systemctl enable ovn-northd
$ sudo systemctl start ovn-northd

-- 
Russell Bryant
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