[Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

[Dan Oachs]

I am curious why you are updating the config every 5 minutes.   We used to
do that with our old DHCP server, but with Kea we moved to storing
reservations in a database.  That way we rarely need to make changes to the
actual Kea configuration that would necessitate a reload of the config.

--Dan


On Wed, Nov 16, 2022 at 10:27 AM Veronique Lefebure <
Veronique.Lefebure at cern.ch> wrote:

> Hi,
>
> When running KEA on one single server, (no HA), and updating the KEA dhcp
> configuration file every 5 minute, using "config-set"
>
> https://kea.readthedocs.io/en/latest/arm/ctrl-channel.html?highlight=config-set#the-config-set-command
>  ,
> we can see that KEA does not reply to the DHCP requests during 30-35
> seconds while "config-set" is running.
>
> Is it expected ?
> If yes, if we add a second server in a HA hot-standby mode, can we expect
> it to answer to the DHCP requests while the first server is busy with
> config-set ?
> If yes, we need to update the second server asynchronously with respect to
> the first one, else they would both be busy with "config-set" at the same
> time.
>
> I would be interested to know how people are updating the KEA DHCP
> configuration in a HA hot-standby setup.
>
> Thanks,
> Veronique
>
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