Use nginx as load balancer for Slanger

slanger_nginx_lb.conf

upstream slanger_ws {
  server 127.0.0.1:8001;
  server 127.0.0.1:8002;
  server 127.0.0.1:8003;
  server 127.0.0.1:8004;
  server 127.0.0.1:8005;
  server 127.0.0.1:8006;
  server 127.0.0.1:8007;
  server 127.0.0.1:8008;
}

upstream slanger_api {
  server 127.0.0.1:4501;
  server 127.0.0.1:4502;
  server 127.0.0.1:4503;
  server 127.0.0.1:4504;
  server 127.0.0.1:4505;
  server 127.0.0.1:4506;
  server 127.0.0.1:4507;
  server 127.0.0.1:4508;
}


server {
  listen 8080 default;
  server_name _;

  location / {
	  proxy_pass http://slanger_ws;
	  proxy_http_version 1.1;
	  proxy_set_header Upgrade $http_upgrade;
	  proxy_set_header Connection "upgrade";
	  proxy_set_header Host $host;
  }
}

server {
  listen 4567 default;
  server_name _;

  location / {
	  proxy_pass http://slanger_api;
	  proxy_set_header Host $host;
  }
}