On Thu, Sep 29, 2016 at 10:19:18PM -0600, Scott Lowe wrote:
> Hi all, I was wondering if someone here could help me debug/troubleshoot an
> OVN+Docker environment that I've built for a demo in late October. I have
> three Ubuntu 14.04 nodes running Docker 1.11.2 and OVN 2.6 (built from
> source, including the kernel module). I've followed the instructions from
> INSTALL.Docker.md, and everything *seems* to work. However, I have no
> connectivity between two Docker containers attached to the same Docker
> network and running on two different hosts.
>
> Where should I start to help figure out why connectivity isn't working? I see
> the logical switch in OVN (using `ovn-nbctl ls-list`), the logical ports
> (using `ovn-nbctl lsp-list`), and see the correct addresses on those ports
> (using `ovn-nbctl lsp-get-addresses`). What I *don't* see is any tunnel ports
> in `ovs-vsctl show`. I've verified the STT and Geneve kernel modules are
> loaded.
>
> Any suggestions on what else to check?
Off the top of my head, here are some possible reasons "ovs-vsctl show"
might not show any tunnel ports on a given chassis:
* ovn-controller isn't running.
* ovn-controller can't connect to the southbound database, to read
or write the Chassis table. The ovn-controller log should
indicate this.
* ovn-controller can't connect to the ovs-vswitchd database, to add
ports to the integration bridge. The ovn-controller log should
indicate that.
* ovn-controller doesn't know what bridge is the integration bridge,
or it has been told the wrong bridge. From memory, I believe that
it gets this configuration from the Open_vSwitch table in the
ovs-vswitchd database.
* The ovn-controllers don't know what IP address or tunneling
protocol to advertise, so they can't tell this chassis how to
connect to them. From memory, I believe that ovn-controller gets
this configuration from the Open_vSwitch table in the ovs-vswitchd
database.
(The kernel modules don't actually matter for this purpose. They'd only
come into play once the tunnel ports were added to the ovs-vswitchd
database.)
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