[Kea-users] lease reclamation disabled on backup server

[Darren Ankney]

Hi Kåre,

This change is intentional (see:
https://gitlab.isc.org/isc-projects/kea/-/issues/3693) though the
intent wasn't specifically to change the backup server behavior but
rather the avoidance of reclamation during lease syncing.  This
sometimes triggered ddns deletes where none should have existed.  The
backup server (as noted in this chart:
https://kea.readthedocs.io/en/kea-3.0.3/arm/hooks.html#id10) never
enables the DHCP service.

Thank you,
Darren Ankney

On Wed, Mar 11, 2026 at 8:56 AM Kåre Hviid <ukh at svansen.se> wrote:
>
> Hi,
>
> It appears to me that lease reclamation is disabled on backup servers on Kea
> 3.0.
>
> I'm running kea-dhcp4 3.0.2 (isc20251017150356 deb) in a load-balancing HA
> setup with memfile lease-database.  I'm using three servers: a primary, a
> secondary, and a passive backup.  Automatic lease reclamation works fine on
> the primary and the secondary, but does not happen on the backup server.
>
> Using the same setup, but with 2.6.4 (isc20250717094354 deb), lease
> reclamation does take place on the backup server.
>
> It appears to me that this change was introduced in 2.7.7 with commit
> 04f61c8758d541eba5018c673b1ad2daaf9a62c5, but I don't understand whether
> the observed behavior is intentional or an unfortunate side effect.  Or if I'm
> completely off track.
>
> Regards,
> Kåre
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