From Manual:

By default, nginx caches answers using the TTL value of a response. An optional|valid|parameter allows overriding it:

   resolver 127.0.0.1 [::1]:5353 valid=30s;

   Before version 1.1.9, tuning of caching time was not possible, and
   nginx always cached answers for the duration of 5 minutes.

Best regards,
Vintila Mihai Alexandru

On 5/12/2016 12:36 PM, RT.Nat wrote:
Troubled up in DNS caching of the IP address for a given DNS name.

Adding the solution given below does not solve the problem of DNS caching in
NGINX.

resolver 8.8.8.8;
set $upstream_endpoint https://example.net:8080;
location / {
     proxy_pass $upstream_endpoint;
}

Is there any solutions?

Posted at Nginx Forum: 
https://forum.nginx.org/read.php?2,266857,266857#msg-266857

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