Nginx and haproxy configuration for balancing a bunch of HTTP servers running on different ports

haproxy.cfg

global
  maxconn 4096
  pidfile /tmp/haproxy-queue.pid

defaults
  mode http
  timeout connect 300000
  timeout client 300000
  timeout server 300000
  maxconn 2000

frontend http-in
  bind *:8080
  default_backend servers

backend servers
  balance roundrobin
  server app1 127.0.0.1:9292 maxconn 100
  server app2 127.0.0.1:9293 maxconn 100
  server app3 127.0.0.1:9294 maxconn 100
  server app4 127.0.0.1:9295 maxconn 100
  server app5 127.0.0.1:9296 maxconn 100
  server app6 127.0.0.1:9297 maxconn 100
  server app7 127.0.0.1:9298 maxconn 100

nginx.conf

worker_processes 1;

events {
    worker_connections  1024;
}

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

    sendfile        on;
    gzip            on;

    keepalive_requests 1000;

    proxy_http_version 1.1;
    proxy_set_header Connection "";

    upstream backend  {
        server 127.0.0.1:9292;
        server 127.0.0.1:9293;
        server 127.0.0.1:9294;
        server 127.0.0.1:9295;
        server 127.0.0.1:9296;
        server 127.0.0.1:9297;
        server 127.0.0.1:9298;

        keepalive 100;
    }

    server {
        listen       8080;
        server_name  localhost;

        location / {
            proxy_pass http://backend;
        }
    }
}