sample haproxy.cfg

gistfile1.sh

global 
  log 127.0.0.1 local0 notice 
  maxconn 50000
  daemon 
  stats socket /tmp/proxystats level admin
defaults
  log global 
  mode http 
  option httplog 
  option dontlognull 
  stats enable 
  stats uri /proxystats   
  stats auth some:supersecretcredential
  stats refresh 5s 
  contimeout 120000
  clitimeout 120000
  srvtimeout 120000
  option redispatch
  option forwardfor
  option http-server-close

frontend http
  bind :80
  acl correctdomain hdr(host)	www.ourdomain.com
  acl static url_reg (html|js|css|png|jpg|gif)$
  acl static url_beg /static
  acl api url_beg /api
  acl mobile  url_beg /mobile
  acl blog  url_beg /blog
  redirect location http://www.ourdomain.com if !correctdomain
  use_backend static if static
  use_backend api if api
  use_backend mobile if mobile
  use_backend blog if blog
  default_backend static # lets let the static servers handle 404s and junk

frontend redis
  mode tcp
  bind :6379
  server redis-master 10.10.1.1:6379 check
  server redis-hotspare 10.10.1.2:6380 check disabled

frontend mysql
  mode tcp
  bind :3306
  balance source
  server mysql-master 10.10.2.1:3306 check
  server mysql-slave 10.10.2.2:3306 check 

backend static
  mode http
  balance roundrobin
  server ngnix1 10.10.10.1:80 check inter 60s rise 5 fall 2
  server ngnix2 10.10.10.2:80 check inter 60s rise 5 fall 2
  server ngnix3 10.10.10.3:80 check inter 60s rise 5 fall 2
  server ngnix4 10.10.10.4:80 check inter 60s rise 5 fall 2
  server ngnix5 10.10.10.5:80 check inter 60s rise 5 fall 2
  server ngnix6 10.10.10.6:80 check inter 60s rise 5 fall 2
  server ngnix7 10.10.10.7:80 check inter 60s rise 5 fall 2
  server ngnix8 10.10.10.8:80 check inter 60s rise 5 fall 2
  server ngnix9 10.10.10.9:80 check inter 60s rise 5 fall 2
  server ngnix10 10.10.10.10:80 check inter 60s rise 5 fall 2

backend mobile
  mode http
  balance leastconn
  monitor-uri /mobile_app_check
  server mobile1 10.10.20.1:80 check inter 60s rise 5 fall 2
  server mobile2 10.10.20.2:80 check inter 60s rise 5 fall 2
  server mobile3 10.10.20.3:80 check inter 60s rise 5 fall 2
  server mobile4 10.10.20.4:80 check inter 60s rise 5 fall 2
  server mobile5 10.10.20.5:80 check inter 60s rise 5 fall 2
  server mobile6 10.10.20.6:80 check inter 60s rise 5 fall 2
  server mobile7 10.10.20.7:80 check inter 60s rise 5 fall 2
  server mobile8 10.10.20.8:80 check inter 60s rise 5 fall 2
  server mobile9 10.10.20.9:80 check inter 60s rise 5 fall 2
  server mobile10 10.10.20.10:80 check inter 60s rise 5 fall 2
  server mobile11 10.10.20.11:80 check inter 60s rise 5 fall 2
  server mobile12 10.10.20.12:80 check inter 60s rise 5 fall 2
  server mobile13 10.10.20.13:80 check inter 60s rise 5 fall 2
  server mobile14 10.10.20.14:80 check inter 60s rise 5 fall 2
  server mobile15 10.10.20.15:80 check inter 60s rise 5 fall 2
  server mobile16 10.10.20.16:80 check inter 60s rise 5 fall 2
  server mobile17 10.10.20.17:80 check inter 60s rise 5 fall 2
  server mobile18 10.10.20.18:80 check inter 60s rise 5 fall 2
  server mobile19 10.10.20.19:80 check inter 60s rise 5 fall 2
  server mobile20 10.10.20.20:80 check inter 60s rise 5 fall 2

backend api
  mode http
  balance leastconn
  monitor-uri /api_app_check
  server api1 10.10.30.1:80 check inter 60s rise 5 fall 2
  server api2 10.10.30.2:80 check inter 60s rise 5 fall 2
  server api3 10.10.30.3:80 check inter 60s rise 5 fall 2
  server api4 10.10.30.4:80 check inter 60s rise 5 fall 2
  server api5 10.10.30.5:80 check inter 60s rise 5 fall 2
  server api6 10.10.30.6:80 check inter 60s rise 5 fall 2
  server api7 10.10.30.7:80 check inter 60s rise 5 fall 2
  server api8 10.10.30.8:80 check inter 60s rise 5 fall 2
  server api9 10.10.30.9:80 check inter 60s rise 5 fall 2
  server api11 10.10.30.11:80 check inter 60s rise 5 fall 2
  server api12 10.10.30.12:80 check inter 60s rise 5 fall 2
  server api13 10.10.30.13:80 check inter 60s rise 5 fall 2
  server api14 10.10.30.14:80 check inter 60s rise 5 fall 2
  server api15 10.10.30.15:80 check inter 60s rise 5 fall 2
  server api16 10.10.30.16:80 check inter 60s rise 5 fall 2
  server api17 10.10.30.17:80 check inter 60s rise 5 fall 2
  server api18 10.10.30.18:80 check inter 60s rise 5 fall 2
  server api19 10.10.30.19:80 check inter 60s rise 5 fall 2
  server api20 10.10.30.20:80 check inter 60s rise 5 fall 2

backend blog
  mode http
  balance roundrobin
  server blogs1 10.10.40.1:80 check inter 60s rise 5 fall 2
  server blogs2 10.10.40.1:80 check inter 60s rise 5 fall 2
  server blogs3 10.10.40.1:80 check inter 60s rise 5 fall 2