[Kea-users] Monitoring a Kea cluster

[Klaus Steden]

FWIW we also primarily use Monit to keep tabs on the Kea daemons in our
environment. Because we're using MySQL backends, the Monit watchdog can
safely restart the daemon if it crashes or becomes unresponsive.

There is an external watchdog service we use to check the process table for
the daemon as well, but that sees almost no usage because Monit does the
job so well.

cheers,
Klaus

On Tue, Dec 27, 2022 at 12:42 PM Darren Ankney <darren.ankney at gmail.com>
wrote:

> I had a thought regarding how you could implement some sort of monitoring
> solution for DHCPv6.  I don’t think you could implement a client but it
> should be possible to pretend to be a relay agent to perform a monitoring
> function for DHCPv6 like I described for DHCPv4.  I think that is the way
> that dhcperf functions depending on the options chosen…
>
> On Dec 27, 2022, at 3:35 PM, Eric Graham <eric.graham at vantagepnt.com>
> wrote:
>
> One way to monitor is with Stork. It won't alert you, but it does have an
> API that collects events such as failure to communicate with a daemon using
> the Kea control agent, or HA state changed. One can poll that API and emit
> alerts based on the interesting events. Stork agents also have Prometheus
> built in, so you can have your Prometheus server send alerts on some
> conditions. For example, alert if a subnet is 80% full, 20% lower than
> average, has only been decreasing in count for x minutes, etc. (disclaimer,
> I haven't done this yet).
>
> I would be much more comfortable with an actual DHCP client, though, like
> Darren described. One could use dhcperf, or something like scapy. But I am
> also interested in a better monitoring solution.
>
> *Eric Graham*
> *DevOps Specialist*
> Direct: 605.990.1859
> Eric.Graham at vantagepnt.com <eric.graham at vantagepnt.com>
>
> *<Outlook-c1ooi2ao.png>*
> ------------------------------
> *From:* Kea-users <kea-users-bounces at lists.isc.org> on behalf of Stefan
> G. Weichinger <lists at xunil.at>
> *Sent:* Tuesday, December 27, 2022 12:10 AM
> *To:* kea-users at lists.isc.org <kea-users at lists.isc.org>
> *Subject:* [Kea-users] Monitoring a Kea cluster
>
> CAUTION: This email originated outside the organization. Do not click any
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>
> As I upgraded my isc-kea cluster to Debian 11.6 last week and rebooted
> the 2 nodes we noticed that initially there were no DHCP-leases offered
> until I restarted the isc-kea-dhcp4 service (on the primary node of the
> cluster).
>
> Maybe a one time issue, I don't know.
>
> -
>
> In consequence I´d like to monitor the DHCP-services somehow.
>
> I don't run a "real" monitoring like Nagios or Icinga at that site, but
> use "monit" for basic monitoring ...
>
> I added a check to monitor the isc-kea-dhcp4 service itself: does it
> run, does it behave, if not, restart it.
>
> And I added a check to monitor the timestamp of the leases file: if not
> changed for N minutes, alert me.
>
> That is very basic and not even fully OK IMO: the leases file gets
> rotated ... etc etc
>
> I browsed for a check tool and found "dhcping". So far I wasn't able to
> get a working reply out of that tool :-( ...
>
> How do you monitor Kea, are there any recommended ways of doing that?
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