[Kea-users] libdhcp_subnet_cmds and database insert

[Darren Ankney]

Hi,

One more update, it should be noted that the libdhcp_subnet_cmds.so
(https://kea.readthedocs.io/en/stable/arm/hooks.html#libdhcp-subnet-cmds-so-subnet-commands-to-manage-subnets-and-shared-networks)
hook is incompatible with the configuration backend and cannot be used
to alter the subnet configuration anywhere but in memory (written out
to the configuration file with a subsequent config-write call).  This
is noted here: https://kea.readthedocs.io/en/stable/arm/config.html#incompatible-software

Thank you,
Darren Ankney

On Wed, Nov 19, 2025 at 9:45 AM Darren Ankney <darren.ankney at gmail.com> wrote:
>
> Hello,
>
> Using the configuration backend
> (https://kea.readthedocs.io/en/stable/arm/dhcp6-srv.html#dhcp6-cb)
> requires loading two hooks:
>
> - libdhcp_cb_cmds.so
> (https://kea.readthedocs.io/en/stable/arm/hooks.html#libdhcp-cb-cmds-so-configuration-backend-commands)
> which provides the API commands necessary to manage the configuration
> in the database.
> - and one of libdhcp_mysql.so
> (https://kea.readthedocs.io/en/stable/arm/hooks.html#libdhcp-mysql-so-database-backend-for-mysql)
> or libdhcp_pgsql.so
> (https://kea.readthedocs.io/en/stable/arm/hooks.html#libdhcp-pgsql-so-database-backend-for-postgresql)
> depending on which database server software you use.
>
> Thank you,
> Darren Ankney
>
> On Tue, Nov 18, 2025 at 6:44 PM Marcin Jurczuk <spock at omegastar.eu> wrote:
> >
> > Hi,
> > I read basically all documentation about libdhcp_subnet_cmds hook and I still can't figure out how to force system to puth subnet config to database.
> > hosts_cmds have this option  called "operation-target" that allows you to define where config should be stored. It is not mentioned in subnet hook.
> > I'm able to insert network to config file(after API call to write cfg) but not to db.
> > What is operation-target equivalent or how force kea do save subnet to database.
> >
> > Thanks in advance.
> > --
> > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> >
> > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > Kea-users at lists.isc.org