HAProxy config for geoserver load balancing, with a master instance

haproxy.cfg

global
  chroot /var/lib/haproxy
  daemon  
  group haproxy
  maxconn 2000
  user  haproxy

defaults
  mode http
  option redispatch
  retries 3
  option httpclose
  timeout connect 5000
  timeout client 10000
  timeout server 10000

frontend geoservers
  bind localhost:8189
  acl is_config path_beg /geoserver/web /geoserver/rest /geoserver/j_spring_security_check
  default_backend slaves
  use_backend master if is_config
  timeout client 1m

backend slaves
  balance  roundrobin
  timeout server 1m
  timeout connect 10s
  option forwardfor
  option http-server-close
  server geoserver1 127.0.0.1:8191 maxconn 1000 check port 8191
  server geoserver2 127.0.0.1:8192 maxconn 1000 check port 8192
 
backend master
  option forwardfor
  option http-server-close
  server geoserver0 127.0.0.1:8190 check port 8190

listen admin
  bind *:8888
  mode http
  stats enable
  stats uri /haproxy?stats