[Kea-users] kea-2.2.0 - HA cluster - communication between stork and dhcp4 gets lost

[Eric Graham]

Stefan,

What version of Stork are you using? I saw a similar issue<https://gitlab.isc.org/isc-projects/stork/-/issues/792> in 1.7.

Do your Kea control agent logs show any issues during the event?

Eric Graham
DevOps Specialist
Direct: 605.990.1859
Eric.Graham at vantagepnt.com<mailto:eric.graham at vantagepnt.com>
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________________________________
From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Stefan G. Weichinger <lists at xunil.at>
Sent: Thursday, June 22, 2023 12:55 AM
To: kea-users at lists.isc.org <kea-users at lists.isc.org>
Subject: [Kea-users] kea-2.2.0 - HA cluster - communication between stork and dhcp4 gets lost

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We see this in the stork events every few days:

2023-06-20 20:01:23     daemon [2] dhcp4 is unreachable

2023-06-20 20:01:07     Communication with daemon [2] dhcp4 of app
kea at 10.0.0.231 failed

After a restart of both dhcp4 and stork-agent on that adc1-server things
work again.

I will have to check the logs in more detail, sure.

2 things:

1) we collect the prometheus metrics from stork and visualize them in
Grafana.

storkserver_auth_unreachable_machine_total{instance=~"$instance"}

is always 0, even when the mentioned events are seen and I would assume
that one of 2 machines should be marked unreachable. Right?

2) it's not solving the problem at the root, but I consider setting up
some external monitoring to detect this outage and let the monitoring
restart the daemons ...

I use monit (https://mmonit.com/wiki/Monit/ConfigurationExamples) for
such things, and think of letting it do http-API-calls to isc-kea to
check things.

Right approach?

thanks, Stefan
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