As of Nginx 1.9.2 you can dump the Nginx config with the -T flag:
-T— same as-t, but additionally dump configuration files to standard output (1.9.2).
Source: http://nginx.org/en/docs/switches.html
This is not the same as dumping for a specific process. If your Nginx is using a different config file, check the output for ps aux and use whatever it gives as the binary, e.g. if it gives something like
nginx: master process /usr/sbin/nginx -c /some/other/config
you need to run
/usr/sbin/nginx -c /some/other/config -T
If you are not on 1.9.2 yet, you can dump the config with gdb:
- https://serverfault.com/questions/361421/dump-nginx-config-from-running-process