Choosing A records based on hosts' load?

Tyler Ament tyler at
Mon Jan 18 18:03:42 UTC 2021

Hi Marek, 

One way you can handle this sort of situation is with Varnish Cache. You can use it as a load balancer but it also has a lot of control over the actual flow of requests, etc. that you can use to accomplish various outcomes.  

One relevant documentation.

Sorry to clutter the group here, but trying to assist w redirect of this question to a non-DNS direction since numerous BIND folks here saying not technically on-topic. 


> On Jan 18, 2021, at 1:49 AM, Marek Kozlowski <m.kozlowski at> wrote:
> :-)
> I believe that such a solution (read to install) should exist. Unfortunately I don't know the magic keywords to find it:
> I have a group of hosts with different IPs offering the same services. I'm able to install some agents on them for monitoring their network/cpu/number of users/whatever utilization. I'm wondering if there is an option for BIND9 to obtain those load parameters on a regular basis (let's say: every 10 minutes) and when queried for the A record return ONLY one IP address - the one of the server with the lowest utilization?
> It can be implemented on those servers but in the solution I'm asking about the key point is that the BIND server takes the decision.
> Thanks in advance,
> best regards,
> Marek
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