Get client IP in nginx logs from x-Forward-For header

    include       /etc/nginx/mime.types;

    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '

                      '$status $body_bytes_sent "$http_referer" '

                      '"$http_user_agent" "$remote_addr"';

    log_format main '$http_x_forwarded_for - $remote_user [$time_local] '

                    '"$request" $status $body_bytes_sent '

                    '"$http_referer" "$http_user_agent"';

    error_log  /var/log/nginx/spot-error.log warn;

    access_log  /var/log/nginx/spot-access.log main;