Dynamic DNS Resolution in Nginx

medium.com

I'd rather reccomend using the "valid" parameter for resolver than using a variable.

Like: resolver 10.0.0.2 valid=30s;

By default, the resolver directive should honor the TTL of the DNS entry it resolves (http://nginx.org/en/docs/http/ngx_http_core_module.html#reso...). The load balancer DNS TTL of 60s is a value we didn't feel we needed to override.