Installation guide

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4. Give the worker a unique ident ity

Edit JBOSS_EAP_DIST/jboss-as/server/PROFILE/deploy/jbossweb.sar/server.xml and

add a jvmRoute attribute and value to the Engine element, as shown:

Use a unique jvmRoute value for each node.

5. Opt ional: Configure firewall t o re ceive multicast Proxy Server advertisements

A proxy server using the JBoss HTT P Connector can advertise itself via UDP multicast. T o enable

the worker node to dynamically discover proxy servers, open port 23364 for UDP connections on

the worker node's firewall.

Use the following command on Red Hat Enterprise Linux to achieve this:

/sbin/iptables -A INPUT -m state --state NEW -m udp -p udp --dport 23364 -j

-m comment --comment "receive mod_cluster proxy server advertisements"

/sbin/iptables save

If you are not using Automatic Proxy Discovery (see Automatic Proxy Discovery), configure worker

nodes with a static list of proxies. Refer to Section 9.1, “Static proxy configuration” for directions. In

this case you can safely ignore the following warning message:

[warning] mod_advertise: ServerAdvertise Address or Port not defined,

Advertise disabled!!!

Important

If your nodes are on different machines that run Red Hat Enterprise Linux, they may not

acknowledge each other automatically. JBoss Clustering relies on the UDP (User Datagram

Protocol) multicasting provided by jGroups. Red Hat Enterprise Linux blocks these packets

by default.

To allow the packets, modify the iptables rules (as root). T he following commands apply to

an IP address that matches 192.168.1.x:

/sbin/iptables -I RH-Firewall-1-INPUT 5 -p udp -d 224.0.1.0/24 -j

/sbin/iptables -I RH-Firewall-1-INPUT 5 -p udp -d 224.0.0.0/4 -j

/sbin/iptables -I RH-Firewall-1-INPUT 9 -p udp -s 192.168.1.0/24 -j

/sbin/iptables -I RH-Firewall-1-INPUT 10 -p tcp -s 192.168.1.0/24 -j

/etc/init.d/iptables save

Task: Insta ll and Configure a JBoss Enterprise Web Server Worker Node

Follow this procedure to install the JBoss HTT P Connector on a JBoss Enterprise Web Server node and

configure it for non-clustered operation.

Prerequisit es

Install a supported JBoss Enterprise Web Server.

Understand the Proxy Configuration parameters discussed in Appendix B, Reference: Java

properties

1. Deploy worker node service

Copy all of the library files in the JBOSS_EAP_DIST/mod_cluster/JBossWeb-Tomcat/lib

directory. Move these files to JBOSS_EWS_DIST/tomcat6/lib/

2. Add a Listener t o T omcat

Add the following Listener element beneath the other Listener elements in

JBOSS_EWS_DIST/tomcat6/conf/server.xml.

<Listener className="org.jboss.modcluster.ModClusterListener"

advertise="true" stickySession="true" stickySessionForce="false"

stickySessionRemove="true"/>

3. Give this worker a unique ident ity

Edit JBOSS_EWS_DIST/tomcat6/conf/server.xml and add a jvmRoute attribute and value to

the <Engine> element, as shown:

4. Opt ional: Configure firewall t o re ceive Proxy Server a dve rtise ments

JBoss Enterprise Application Platform 5 HTTP Connectors Load Balancing Guide 31