[Kea-users] External script to enable or disable pools

[Munroe Sollog]

I haven't designed it yet to be honest.  the environment is such that the network is served by two
gateways using two independent providers.  The thought is to load balance the users out each
gateway, and with a short enough lease time if one of the providers suffers an extended outage the
DHCP server can 'fail' all of the clients over to the working gateway via lease expiration.

- Munroe

On 07/27/2016 12:46 PM, Tomek Mrugalski wrote:
> On 27/07/16 17:03, Munroe Sollog wrote:
>> I am working on deploying a DHCP server with two declarations. They
>> will be serving the same VLAN and offering nonoverlapping pools.
>> Each pool will be using a different gateway address. I would like the
>> ability for a service (nagios) to be able to enable or disable a pool
>> if/when the upstream gateway becomes unavailable.
> Do you want this to be modeled as two subnets with one pool in each or
> as one subnet with two pools in it?
> 
> Please note that Kea currently does not provide the ability to tie
> different option values with specific pools. You can currently define
> options on global, subnet, client class and host levels.
> 
> Also, keep in mind that once Kea (or any other DHCP server for that
> matter) sends out a configuration to clients, they will use it and will
> only get back to renew their configuration after renew-timer elapses.
> This means that any changes will not be picked up instantly. In
> principle there's a reconfigure mechanism, but since it is not
> mandatory, majority of the clients don't support it, so it's risky to
> depend on it.
> 
>> Does Kea currently support any sort of API that would allow me to
>> achieve this?
> Not at this moment, but we're in a process of designing such an API. We
> currently have requirements written and are looking for feedback. The
> current proposal is available here:
> http://kea.isc.org/wiki/ControlAPIRequirements. I would be great if you
> could review it and check if what we intend to implement would work for you.
> 
> We are looking for sponsors of that work and for people who are willing
> to test engineering prototypes once we have it developed. Let me know if
> you are interested.
> 
>> I know that I could, through a script, edit the configuration and
>> reload/restart the daemon, but I was wondering if there was a more
>> elegant way.
> There isn't any at the moment, but we're hoping to have that capability
> in not so distant future. Depending on how popular this feature will be
> among existing and prospective customers we may develop it sooner or
> much later.
> 
> Tomek
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-- 
Munroe Sollog
LTS - Network Analyst
x85002