If you’re using a load balancing service like the AWS Elastic Load Balancer, your log files are probably populated with every request coming from the same IP - your load balancer. Here’s a quick fix to get the real IP from your users.
Open up /etc/nginx/nginx.conf and add the following text just after your http block opens:
real_ip_header X-Forwarded-For;
set_real_ip_from 0.0.0.0/0;
If your server can be accessed outside of the load balancer, change that 0.0.0.0/0 to the IP address of your load balancer:
set_real_ip_from 123.123.123.123;
After this is done just reload nginx:
sudo nginx -s reload