[Kea-users] DHCP redundancy

[SoupNazi izaNpuoS]

Out of curiosity, was there a reason you didn't use the built in failover
configuration in ISC DHCP?

On Fri, Nov 17, 2017 at 9:25 AM, John Ratliff <john at bluemarble.net> wrote:

> I'm seeking best practice advice on how to setup DHCP server redundancy
> with kea.
>
> With ISC DHCP, I used VRRP with two servers and configured it to send the
> dhcp-server-identifier option as the VRRP IP. Then I would run a script
> that sync'd the lease database automatically via cron.
>
> This process is messy and error prone, so I would like to use kea instead.
>
> The subnets I am allocating via DHCP is not the same subnet that the
> server is in, so we use ip-helper statements to forward DHCP requests to
> the server.
>
> I have kea using mySQL as a lease backend. The mySQL server is not on the
> same machine as kea.
>
> My first thought was to use VRRP and supply the dhcp-server-identifier
> option again. I ran into a problem though that if kea started before VRRP,
> it wouldn't listen on the VRRP IP. There is probably a solution to that,
> but I don't have one yet.
>
> So then I changed the router configuration to use two ip-helper
> statements, sending the request to both primary and secondary kea servers;
> I also removed the dhcp-server-identifier option. This seems to work.
>
> Is this a reasonable setup for DHCP redundancy with kea? Is there a better
> option I might want to consider? Are there any concerns I should be aware
> of with both servers being active?
>
> Thanks.
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