Oc4j cluster how to?

Question

Hello,
i have downloaded document from metalink and that seems to be very useful.
What is your opinion about below?
If something else is useful, kindly guide.
Appriciate your help.
Thanks and regards,
Kash.
summary is as below:
Reference in metalink:
Bulletin: Configuring Multiple OC4J Instances as a High Availability Cluster
SUMMARY
To configure multiple OC4J instances as a clustered environment with session
replication between instances of the same cluster:
[1] Configure the http-web-site.xml/default-web-site.xml file as follows:
(a) Configure following attributes in <web-site> tag:
- ensure HOST attribute provides fully qualified name of the machine.
- ensure CLUSTER-ISLAND attribute provides same value for all
instances of the cluster.
(b) Add as a child element of <web-site> a <frontend> tag identifying
the hostname and port of the "clusters" global name:
<web-site
display-name="kash:rmi(20001):web(28881)"
host="kash..website.com"
port="28881"
cluster-island="21"
>
<frontend
host="kash.website.com"
port="28080"
/>
[2] Ensure that each web applications "orion-web.xml" deployment descriptor contains or will get generated with a <cluster-config> tag. Ensure that the ID attribute of this tag is set the same for all orion-web.xml files on this container but that different values are used on other instances:
<cluster-config
id="20002"
/>
[3] Edit the http-web-site.xml/default-web-site.xml file and ensure that the
<web-app> tag for any application which propagates state information has a
"load-on-startup" value of "true":
<web-app
application="BalanceTest"
name="web"
root="/bal"
load-on-startup="true"
/>
[4] Edit the "web.xml" deployment description for any web module which will replicate it's session information to other instances and ensure that a
<distributable> tag is present:
<web-app>
<display-name>BalanceTest2881</display-name>
<description>Test of servlet load balancing/failover</description>
<distributable/>
[5] Startup the load-balancer from %ORACLE_HOME%\j2ee\home directory by running:
java -jar loadbalancer.jar -host <generic hostname> -port <port>
-minimumIsland <min> -maximumIsland <max> -debug
[6] Startup individual OC4J instances from %ORACLE_HOME%\j2ee\home directory by running:
java -Dhttp.cluster.debug=true -Dcluster.debug=true -jar oc4j.jar
-config <path to server.xml of instance> -verbosity 10
[7] Browser requests can then be sent using the cluster wide hostname and port number associated with the load-balancer:
http://kash.website.com:28080/bal/BalanceTest
[8] The messages displayed to the console window for each instance can be used to identify the propagation of session state messages (both sent and
received).
Through these messages it is possible to identify and then terminate the
OC4J instance which is currently associated with that session. After this,
further requests to the same URL should will be dispatched to a different
OC4J instance but the same session values will be seen.
Edited by: user10419491 on Jun 23, 2009 10:42 PM

Answer 1

Hello,
There is another method to configure OC4J Cluster: From the Admin GUI (em)
Seems its very easy and riskless.
I have seen some recommendations to not configure from the flat files.
Where i think if the em does not support you for some features, then we have no choice but use files.
Any opinion please?
Thanks and regards,
-Kash.