nginx.conf

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid  logs/nginx.pid;


events {
  worker_connections  1024;
}


http {
  include       mime.types;
  default_type  application/octet-stream;

  #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
  #                  '$status $body_bytes_sent "$http_referer" '
  #                  '"$http_user_agent" "$http_x_forwarded_for"';

  #access_log  logs/access.log  main;

  sendfile        on;
  #tcp_nopush     on;

  #keepalive_timeout  0;
  keepalive_timeout  65;

  upstream docker_simple_server {
    server 127.0.0.1:3001 weight=10;
    server 127.0.0.1:3002 weight=10;
    server 127.0.0.1:3003 weight=10;
  }
  server {
    listen 3006;
    location / {
      proxy_pass http://docker_simple_server;
    }
  }
}