Hello!

On Thu, Sep 27, 2018 at 03:27:03PM +0100, Rob Fulton wrote:

> I’ve done some further testing on this today and discovered that
> the configuration works correctly when the proxy_pass url is
> accessed via http, I can see dns queries for the proxy_server
> url every minute as per the ttl. The moment I change the url to
> https, this stops. Is this a known limitation?

Most likely, the problem is that you have

proxy_pass https://somehostname.com;

somewhere in the configuration, without variables - so nginx
resolves the name during configuration parsing. As a result, your
construct

set $proxy_server somehostname.com;
proxy_pass https://$proxy_server;

does not try to resolve the name, but rather ends up using the
existing upstream for somehostname.com.

If you want the name to be always resolved, comment out the
proxy_pass without variables and/or use the variables there as
well.

--
Maxim Dounin
http://mdounin.ru/
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