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I have my JBoss Application in cluster. When I start my domain.sh in all the nodes and run the application. My Application freezes even for normal db transactions from App.

When I observed my Apache I'm getting some warnings. Is this warnings are causing the problem, if so what is the salvation......

Here is my Apache Configuration...... I had followed minimal configuration which was given jboss mod_cluster documentation....

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
LoadModule slotmem_module modules/mod_slotmem.so
LoadModule manager_module modules/mod_manager.so
LoadModule proxy_cluster_module modules/mod_proxy_cluster.so
LoadModule advertise_module modules/mod_advertise.so


<VirtualHost 10.252.103.77:80>
<Location />
Order deny,allow
Allow from all
</Location>
<Location /mod_cluster-manager>
SetHandler mod_cluster-manager
Order deny,allow
Allow from all
</Location>
KeepAliveTimeout 60
MaxKeepAliveRequests 0
ManagerBalancerName mycluster
ServerAdvertise On
EnableMCPMReceive
</VirtualHost>

When I start or restart my Apache Web Server I'm getting following WARN's.......

~]$ sudo /etc/init.d/httpd restart
Stopping httpd:                                            [  OK  ]
Starting httpd: [Mon Dec 07 12:19:17 2015] [warn] module proxy_module is already loaded, skipping
[Mon Dec 07 12:19:17 2015] [warn] module proxy_ajp_module is already loaded, skipping
httpd: Could not reliably determine the server's fully qualified domain name, using 10.252.103.77 for ServerName
                                                           [  OK  ]

I had copied all the modules which were used to the appropriate modules directory....... My domain runs on Redhat Enterprise Linux 64 bit...... So I had copied x86_64 bit version of .so files....

Dev Anand Sadasivam
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2 Answers2

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I had commented following .so modules as those were already loaded..... Although it is just WARN for proxy module, it is unappropriated as couple of modules were loaded and works in dualmode....

#LoadModule proxy_module modules/mod_proxy.so
#LoadModule proxy_ajp_module modules/mod_proxy_ajp.so

As I copied appropriate modules (x86_64) required.... fresh proxy_ajp proxy modules is in function instead of default ones.... SO JBoss cluster config succeeds.......

Dev Anand Sadasivam
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  • `x86_64` is Intel `x86` 32-Bit Compatible 64-Bit version. Please use command `uname -a` and appropriately use the libraries(.so files). If your os 64-Bit then don't go for `x86_64` rather go for `64-Bit`. If it is `i586` or lower use 32-Bit version of libraries(.so files). Basically AMD 64 bit processor gave compatibility 32-Bit intel x86 instruction set as well,- hence uses `x86_64` version of o.s. Else 64-Bit AMD version of o.s. needs to be loaded. That's why `x86_64`, so Intel 64-Bit, 32-Bit processor can also be used in turn. – Dev Anand Sadasivam Dec 14 '15 at 05:12
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Messages: [Mon Dec 07 12:19:17 2015] [warn] module proxy_module is already loaded, skipping [Mon Dec 07 12:19:17 2015] [warn] module proxy_ajp_module is already loaded, skipping are completely harmless.

Message: httpd: Could not reliably determine the server's fully qualified domain name, using 10.252.103.77 for ServerName could affect your domain name based redirections and SSL certificates issued for a particular domain, but it has little to nothing to do with mod_cluster's operation.

Michal Karm Babacek
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  • We haven't configured FQDN. In my case Apache version is `[Web-01~]$ httpd -v Server version: Apache/2.2.15 (Unix) Server built: Mar 3 2015 12:06:14 ` And when this warn comes I have problem in my Deployed App like it freezes. Maybe my Cluster Config is not stable enough. However I hope even if it is WARN, it might break the cluster bridge. Not every code is so proper, particularly when we work across and in case of interoperability. After I sort out this WARNs my App is running stably. There are other issues but weren't like it frozen. – Dev Anand Sadasivam Jan 13 '16 at 04:59