Made balance configurable.

Author: techpines

haproxy/attributes/default.rb

@@ -46,3 +46,5 @@ def random_haproxy_pw
 
 default[:haproxy][:stats_password] = random_haproxy_pw
 default[:haproxy][:enable_stats] = false
+
+default[:haproxy][:balance] = 'roundrobin'

haproxy/templates/default/haproxy.cfg.erb

@@ -40,13 +40,13 @@ defaults
 listen application 0.0.0.0:80
   # configure a fake backend as long as there are no real ones
   # this way HAProxy will not fail on a config check
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   server localhost 127.0.0.1:8080 weight 1 maxconn 5 check
 <% else -%>
 
 <% if !node[:haproxy][:rails_backends].empty? -%>
 backend rails_app_servers
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option forwardfor
   option httpchk <%= node[:haproxy][:health_check_method] %> <%= node[:haproxy][:health_check_url] %>
@@ -58,7 +58,7 @@ backend rails_app_servers
 <% if !node[:haproxy][:rails_backends].empty? -%>
 backend rails_app_servers_ssl
   mode tcp
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option ssl-hello-chk
   <% node[:haproxy][:rails_backends].each do |backend| -%>
@@ -68,7 +68,7 @@ backend rails_app_servers_ssl
 
 <% if !node[:haproxy][:php_backends].empty? -%>  
 backend php_app_servers
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option forwardfor
   option httpchk <%= node[:haproxy][:health_check_method] %> <%= node[:haproxy][:health_check_url] %>
@@ -80,7 +80,7 @@ backend php_app_servers
 <% if !node[:haproxy][:php_backends].empty? -%>  
 backend php_app_servers_ssl
   mode tcp
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option ssl-hello-chk
   <% node[:haproxy][:php_backends].each do |backend| -%>
@@ -90,7 +90,7 @@ backend php_app_servers_ssl
 
 <% if !node[:haproxy][:nodejs_backends].empty? -%>
 backend nodejs_app_servers
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option forwardfor
   option httpchk <%= node[:haproxy][:health_check_method] %> <%= node[:haproxy][:health_check_url] %>
@@ -102,7 +102,7 @@ backend nodejs_app_servers
 <% if !node[:haproxy][:nodejs_backends].empty? -%>
 backend nodejs_app_servers_ssl
   mode tcp
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option ssl-hello-chk
   <% node[:haproxy][:nodejs_backends].each do |backend| -%>
@@ -112,7 +112,7 @@ backend nodejs_app_servers_ssl
 
 <% if !node[:haproxy][:static_backends].empty? -%>  
 backend static_servers
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option forwardfor
   option httpchk GET <%= node[:haproxy][:health_check_url] %> # Nginx doesn't understand OPTIONS
@@ -124,7 +124,7 @@ backend static_servers
 <% if !node[:haproxy][:static_backends].empty? -%>  
 backend static_servers_ssl
   mode tcp
-  balance source
+  balance <%= node[:haproxy][:balance] %>
   option redispatch
   option ssl-hello-chk
   <% node[:haproxy][:static_backends].each do |backend| -%>