[Kea-users] kea configuration file limitations

[Darren Ankney]

Hi Uwe,

The trouble here is the end result should look something like this:

"high-availability": [{

where yours looks like this:

"high-availability": {

This is the difference between:

$array[]['high-availability']

and

$array['high-availability']

Have a look at my "Kea Quick Config" project that makes use of php and
json output if you like.  Maybe you might find something useful there:
https://gitlab.isc.org/isc-projects/kea-quick-config

Thank you,
Darren Ankney

On Tue, Jan 30, 2024 at 8:07 AM Uwe Toenjes <toenjes at rz.uni-leipzig.de> wrote:
>
> Hello everyone,
>
> We are currently migrating our isc dhcp server to the isc kea server.
>
> In our environment, a new configuration file is regularly created and
> reloaded. Unfortunately, the kea server has limitations in the json syntax
> of the configuration file. This makes it impossible to generate the
> configuration automatically.
>
> Here's an example. The configuration file is created using php and the
> function „json_encode($kea_Dhcp4, JSON_PRETTY_PRINT)“ generated. I just copy
> a section of the generated configuration. But the problem can be seen. PHP
> generates a correct json configuration. However, Kea rejects the
> configuration because it expects a list as syntax. In json, however, no list
> is required at this point. Therefore it is not possible to create a kea
> configuration automatically.
>
> Is there a reason for the limitation? Can this limitation be resolved by kea
> in a future version? Or is there another solution to the problem that I
> missed?
>
>
> => The "high-availability" section expects a list with one element. In this
> case, the json functions do not create a list.
> …..
>         "hooks-libraries": [
>             {
>                 "library": "\/usr\/lib64\/kea\/hooks\/libdhcp_lease_cmds.so"
>             },
>             {
>                 "library": "\/usr\/lib64\/kea\/hooks\/libdhcp_ha.so",
>                 "parameters": {
>                     "high-availability": {
>                         "this-server-name": "dhcpdup",
>                         "mode": "hot-standby",
>                         "heartbeat-delay": 5000,
>                         "max-response-delay": 35000,
>                         "multi-threading": {
>                             "enable-multi-threading": true
>                         },
>                         "peers": [
>                             {
>                                 "name": "dhcpdup",
>                                 "url": "http:\/\/172.26.20.2:8001\/",
>                                 "role": "primary"
>                             },
>                             {
>                                 "name": "dhcpdup2",
>                                 "url": "http:\/\/172.26.20.3:8001\/",
>                                 "role": "standby"
>                             }
>                         ]
>                     }
>                 }
>             }
>         ],
> …..
> 2024-01-30 13:55:46.111 INFO  [kea-dhcp4.hooks/31597.140578571736960]
> HOOKS_LIBRARY_LOADED hooks library
> /usr/lib64/kea/hooks/libdhcp_lease_cmds.so successfully loaded
> 2024-01-30 13:55:46.111 ERROR [kea-dhcp4.ha-hooks/31597.140578571736960]
> HA_CONFIGURATION_FAILED failed to configure High Availability hooks library:
> HA configuration must be a list
> 2024-01-30 13:55:46.111 ERROR [kea-dhcp4.hooks/31597.140578571736960]
> HOOKS_LOAD_ERROR 'load' function in hook library
> /usr/lib64/kea/hooks/libdhcp_ha.so returned error 1
>
>
> Thank you for your efforts
>
> Regards
> Uwe
>
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