haproxy.conf

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    log         127.0.0.1 local2 
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will 
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode        http
    log         global
    option      dontlognull
    option      httpclose
    option      httplog
    option      forwardfor
    option      redispatch
    timeout connect 10000 # default 10 second time out if a backend is not found
    timeout client 300000
    timeout server 300000
    maxconn     60000
    retries     3
    stats   enable

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:80
    default_backend             api
   
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend api
    balance     roundrobin
    server  api1 api1:80 check
    server  api2 api2:80 check
    server  api3 api3:80 check
    server  api4 api4:80 check