nginx.conf

load_module modules/ngx_http_opentracing_module.so;

events {}

http {
  opentracing on;

  opentracing_load_tracer /usr/local/lib/liblightstep_tracer_plugin.so /etc/lightstep-config.json;

  upstream backend {
    server backend:3001;
    server backend:3002;
    server backend:3003;
  }

  server {
    error_log /var/log/nginx/debug.log debug;
    listen 8080;
    server_name localhost;

    location = / {
      proxy_pass http://backend;
      opentracing_tag nginx.upstream_addr $upstream_addr;
      opentracing_propagate_context;
    }

    location = /animal {
      opentracing_trace_locations off;

      proxy_pass http://backend;
      opentracing_tag nginx.upstream_addr $upstream_addr;
      opentracing_propagate_context;
    }

    location = /upload/animal {
      opentracing_location_operation_name upload;

      opentracing_tag nginx.upstream_addr $upstream_addr;
      opentracing_tag ngix.client_body_file $request_body_file;

      opentracing_tag zoo.animal $http_admit_animal;
      opentracing_tag zoo.name $http_admit_name;

      limit_except POST { deny all; }

      client_body_temp_path      /tmp/;
      client_body_in_file_only   on;
      client_body_buffer_size    128K;
      client_max_body_size       1000M;

      proxy_set_header           admit-profile-pic $request_body_file;
      proxy_set_body             off;
      proxy_redirect             off;

      proxy_pass http://backend;
      proxy_intercept_errors on;
      opentracing_propagate_context;
      error_page 301 302 303 =200 /;
    }

    location / {
      opentracing_operation_name $request_uri;
      opentracing_trace_locations off;

      root /app/www;
    }

    location ~ \.jpg$ {
      # Tracing each image request creates a lot of noise, so disable
      # opentracing for this location.
      opentracing off;

      root /app/data/images;
    }
  }
}