[ovs-discuss] ovs-appctl to monitor HVs sb connection status

[Han Zhou]

On Mon, Jul 9, 2018 at 3:37 PM, Ben Pfaff <blp at ovn.org> wrote:
>
> On Sun, Jul 08, 2018 at 01:09:12PM -0700, aginwala wrote:
> > As per discussions in past OVN meetings regarding ovn monitoring stand
> > point, need some clarity from design perspective. I am thinking of below
> > approaches:
> >
> > 1. Can we implement something like ovs-appctl -t <sbdb>
chassis-conn/list
> > that will show all HVs stats (connected/non-connected)?
>
> You're interested particularly in which chassis are connected to the ovn
> southbound database?  The db server only knows who is connected to it if
> they provide SSL certificates.  It might not be too hard to get it to
> report the common name (CN) of the SSL certificates for the clients
> connected to it.  Would that suffice?
>
> > 2. or  on individual HVs using ovs-appctl -t ovn-controller
> > chassis-conn/list ?
>
> The HVs definitely don't know who is connected to the sbdb server.
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Discussion in the meeting was about showing connection status to SB-DB on a
given HV, and for that HV only.
So I think a new command like "ovs-appctl -t ovn-controller rconn/show"
should be enough.

The suggestion from Ben is a good one if we are trying to check all HV
connections status from central node point of view.
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