HAproxy virtual site load balancing

haproxy.cfg

# This configuration use acl's to distinguish between url's passwd and then route
# them to the right backend servers. For the backend servers to handle it correctly, you
# need to setup virtual hosting there as well, on whatever you use, tomcat, nginx, apache, etc.
# For this to work with SSL, put pound before HAproxy and use a configuration file similar to
# https://gist.github.com/1984822 to get it working

global
    log 127.0.0.1 local0
    log 127.0.0.1 local1 info
    maxconn 4096
    user haproxy
    group haproxy
    daemon
    stats socket /var/run/haproxy.sock
    pidfile /var/run/haproxy.pid

defaults
    log global
    mode http
    option httplog clf
    option dontlognull
    retries 3
    option redispatch
    maxconn 2000
    contimeout 5000
    clitimeout 50000
    srvtimeout 50000


# status page.
listen stats 0.0.0.0:8000
    mode http
    stats enable
    stats uri /haproxy
    stats realm HAProxy
    stats auth hauser:hapasswd

frontend http-in
    bind *:80

    #### Setup virtual host routing
    # www.example.com
    acl is_www_example_com hdr_end(host) -i www.example.com
    use_backend www_example_com if is_www_example_com

   # mobile.example.com
    acl is_mobile_example_com hdr_end(host) -i mobile.example.com
    use_backend mobile_example_com if is_mobile_example_com

   default_backend default_site

   # www.example.com
    backend www_example_com
      balance roundrobin
      cookie SERVERID insert nocache indirect
      option httpchk HEAD /check.txt HTTP/1.0
      option httpclose
      option forwardfor
      server node1 192.168.1.1:80 cookie node1
      server node2 192.168.1.2:80 cookie node2
      server node3 192.168.1.3:80 cookie node3

    # mobile.example.com
    backend mobile_example_com
      balance roundrobin
      cookie SERVERID insert nocache indirect
      option httpchk HEAD / HTTP/1.0
      option httpclose
      option forwardfor
      server node1 192.168.1.1:2812 cookie node1
      server node2 192.168.1.2:80 cookie node2
      server node3 192.168.1.3:80 cookie node3

backend default_site
    balance roundrobin
    cookie SERVERID insert nocache indirect
    option httpchk HEAD /check.txt HTTP/1.0
    option httpclose
    option forwardfor
    server node1 192.168.1.1:80 cookie node1