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Chapter 4. Configuration example for load-balancing with mod_proxy_cluster
You can configure JBCS to use the mod_proxy_cluster connector for load-balancing in a Red Hat Enterprise Linux system.
When you want to configure a load-balancing solution that uses mod_proxy_cluster, you must perform the following tasks:
4.1. Setting up JBCS as a proxy server
When you configure JBCS to use mod_proxy_cluster, you must set up JBCS as a proxy server by specifying configuration details in the mod_proxy_cluster.conf file.
Procedure
-
Go to the
JBCS_HOME/httpd/conf.d/directory. -
Create a file named
mod_proxy_cluster.conf. Enter the following configuration details:
LoadModule proxy_cluster_module modules/mod_proxy_cluster.so LoadModule cluster_slotmem_module modules/mod_cluster_slotmem.so LoadModule manager_module modules/mod_manager.so LoadModule advertise_module modules/mod_advertise.so MemManagerFile cache/mod_proxy_cluster <IfModule manager_module> Listen 6666 <VirtualHost *:6666> <Directory /> Require ip 127.0.0.1 </Directory> ServerAdvertise on EnableMCPMReceive <Location /mod_cluster_manager> SetHandler mod_cluster-manager Require ip 127.0.0.1 </Location> </VirtualHost> </IfModule>ImportantAs shown in the preceding example, the
mod_proxy_clusterpackage requires that you set theMemManagerFiledirective in theconf.dfile tocache/mod_proxy_cluster.NoteThe preceding example shows how to set up JBCS as a proxy server that is listening on
localhost.
4.2. Configuring a Tomcat worker node
When you configure JBCS to use mod_proxy_cluster, you must configure a Tomcat worker node by adding a Listener element to the server.xml file.
Prerequisites
- You have set up JBCS as a proxy server.
Procedure
-
Open the
JWS_HOME/tomcat<VERSION>/conf/server.xmlfile. Add the following
Listenerelement:<Listener className="org.jboss.modcluster.container.catalina.standalone.ModClusterListener" advertise="true"/>
4.3. Defining iptables firewall rules example
When you configure JBCS to use mod_proxy_cluster, you must define firewall rules by using iptables.
Prerequisites
- You have configured a Tomcat worker node.
Procedure
Use
iptablesto define a set of firewall rules.For example:
/sbin/iptables -I INPUT 5 -p udp -d 224.0.1.0/24 -j ACCEPT -m comment --comment "mod_proxy_cluster traffic" /sbin/iptables -I INPUT 6 -p udp -d 224.0.0.0/4 -j ACCEPT -m comment --comment "JBoss Cluster traffic" /sbin/iptables -I INPUT 9 -p udp -s 192.168.1.0/24 -j ACCEPT -m comment --comment "cluster subnet for inter-node communication" /sbin/iptables -I INPUT 10 -p tcp -s 192.168.1.0/24 -j ACCEPT -m comment --comment "cluster subnet for inter-node communication" /etc/init.d/iptables save
NoteThe preceding example shows to define firewall rules for a cluster node on the
192.168.1.0/24subnet.
