[Kea-users] Problems setting up HA

[Peter Davies]

Hi Tan,
   I strongly advise you to read the Kea ARM for a description of the 
different
HA modes and example configurations.

see: 
https://kea.readthedocs.io/en/kea-2.3.2/arm/hooks.html#ha-high-availability-outage-resilience-for-kea-servers

Kind Regards Peter


On 09/11/2022 15.15, perl-list wrote:
>> On Wed, Nov 9, 2022 at 12:38 PM perl-list < [ mailto:perl-list at network1.net |
>> perl-list at network1.net ] > wrote:
>>> The other one is still receiving the packets, it just isn't doing anything with
>>> them unless it becomes the active device (assuming you chose hot-standby mode)
>> I configured load-balancing mode :S
> Something isn't correct then.  I've never configured the load-balancing mode so I couldn't say what to look for specifically other than something general like:
>
> 1) make sure that both servers are configured in the same HA mode: load-balancing
> 2) Make sure that both servers are receiving the DHCP traffic (you can check with tcpdump to be completely sure)
>
>>> You can perform load testing with perfdhcp: [
>>> https://kea.readthedocs.io/en/kea-2.2.0/man/perfdhcp.8.html |
>>> https://kea.readthedocs.io/en/kea-2.2.0/man/perfdhcp.8.html ]
>> trying to install this conflicts with isc-kea-common...
> you can install it on a different machine (in fact you should - not sure you can test from the same machine).
>
>>> As far as checking functionality of HA, I am not sure... I guess you could shut
>>> down the primary and see what happens? I have done that, but it won't
>>> immediately switch. It will wait until a certain number of clients are trying
>>> to obtain a lease and then switch.
>> stopped dhcp service in server1 and server2 did nothing but complaining about
>> the heartbeat...
>>> That is a tunable parameter, however.
>> Is "max-unacked-clients" ?
> yes - that is the parameter.