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

[perl-list]

The hot-standby will only start after some criteria are met.  Some of the parameters are tunable.  See: https://kea.readthedocs.io/en/kea-1.8.1/arm/hooks.html#load-balancing-configuration  Not sure if you can tune it to start responding within a 30 to 35 second window.

We just modify the config on disk and then restart the kea process, but then we aren't doing anything special with databases or anything, just the JSON config in a single file.  We also aren't changing the config and restarting every 5 minutes.

----- Original Message -----
> From: "Veronique Lefebure" <Veronique.Lefebure at cern.ch>
> To: "kea-users" <kea-users at lists.isc.org>
> Sent: Wednesday, November 16, 2022 11:27:07 AM
> Subject: [Kea-users] How to best update the KEA configuration on a HA hot-standby KEA setup

> 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
> |
> 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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