haproxy.cfg example based on v1.5.3

haproxy.cfg

global
  log 127.0.0.1 local0
  log 127.0.0.1 local1 notice
  log 127.0.0.1:514 local2 notice  
  maxconn 4096
  pidfile tmp/haproxy-queue.pid
 
defaults
    log global
    mode http 
    option httplog
    option dontlognull
    option forwardfor
    retries 3
    option httpchk
    option redispatch
    maxconn 2000
    timeout connect 5000
    timeout client 50000
    timeout server 50000
 
listen leastconn_balancer 127.0.0.1:8080
   mode http
   option httplog
   balance leastconn
   maxconn 10000
   server app1 localhost:8081
   server app2 localhost:8082

listen roundrobin_balancer localhost:8090
   mode http
   option httplog
   balance roundrobin
   server app1 localhost:8081
   server app2 localhost:8082
 
listen admin 127.0.0.1:9100
  mode http
  stats hide-version
  stats uri /
  stats auth  admin:admin123
  stats refresh 5s