anchor.diff:  [IMPORTANT]
   
   Why is the port number 8330 instead of 8080? Please check the settings
  -in host.xml on both master and slave:
  +in host.xml on both primary and secondary hosts:
   
   [source,xml,options="nowrap"]
   ----
  
positive.code: ----
  
  We've set auto-start to true so we don't need to enable it in management
  console each time WildFly restart. Now open slave's host.xml, and modify
  the server-three section:
  
  [source,xml,options="nowrap"]
  ----
  <server name="server-three-slave" group="other-server-group" auto-start="true">
      <!-- server-three avoids port conflicts by incrementing the ports in
           the default socket-group declared in the server-group -->
      <socket-bindings port-offset="250"/>
  
negative.code: [[cluster-configuration]]
  == Cluster Configuration
  
  We will use mod_cluster + apache httpd on primary host as our cluster
  controller here. Because WildFly has been configured to support
  mod_cluster out of box so it's the easiest way.
  
  [IMPORTANT]
  
  The WildFly domain controller and httpd are not necessary to be on
  same host. But in this article I just install them all on primary host for
  convenience.
  
  First we need to ensure that httpd is installed:
  