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From Anam Ali Khan <>
Subject Re: [users@httpd] Apache + Tomcat Load Balancing
Date Mon, 12 Mar 2012 16:40:46 GMT

It looks like very complex configuration in your application environment. You can achieve
the same with HAProxy example as given before.

Why opt for complex configuration instead of easy available solution.


 From: Kashif Rahman <>
Sent: Monday, 12 March 2012, 15:17
Subject: RE: [users@httpd] Apache + Tomcat Load Balancing

Here what I have used :
ProxyRequests Off
        <Proxy *>
          AddDefaultCharset Off
          Order deny,allow
          Allow from all
        ProxyPass /balancer-manager !
        ProxyPass /examples balancer://qawebcluster/examples
        ProxyPassReverse /examples balancer://qawebcluster/examples
        ProxyPass /kashif/admin ajp://x.x.x.x:18009/kashif/admin
        ProxyPassReverse /kashif/admin ajp://x.x.x.x:18009/kashif/admin
        #ProxyPass /kashif balancer://qawebcluster/kashif stickysession=JSESSIONID|jsessionid
        #ProxyPassReverse /kashif balancer://qawebcluster/kashif stickysession=JSESSIONID|jsessionid
        ProxyPass /kashif balancer://qawebcluster/kashif
        ProxyPassReverse /kashif balancer://qawebcluster/kashif
        ProxyPass /k balancer://qawebcluster/k stickysession=JSESSIONID|jsessionid
        ProxyPassReverse /k balancer://qawebcluster/k stickysession=JSESSIONID|jsessionid
       <Proxy balancer://qawebcluster>
          BalancerMember ajp:// route=tomcat1 disablereuse=On
          BalancerMember ajp://x.x.x.x:8009 route=tomcat2 disablereuse=On
          ProxySet lbmethod=byrequests
ProxyPreserveHost Off
ProxyStatus On
We have this config on WEB1 as WEB2 both.  3 machines involved. 1 Apache only for load balancing
and 2 machines as WEB1 and WEB2 having Apache and tomcat on each.
We are using mod_proxy_ajp
Tomcat is clustered. Session replication works, if single Apache is handling 2 tomcat instances.
When we start second Apache, tomcat session replication stops. We want to have failover for
PHP side too. 
Thank you,
Kashif Rahman.
From:Igor Cicimov [] 
Sent: Monday, March 12, 2012 2:12 PM
Subject: RE: [users@httpd] Apache + Tomcat Load Balancing
You can at least tell us what OS are these servers running on? Also you said when you put
second apache something is not working so we would like to see your apache config if you dont
mind. Another thing not clear to me is tomcat session replication. Are the tomcats clustered?
If not how do they replicate the sessions between each other?
In meantime check mod_proxy_balancer documentation as possible solution. You can find lots
of examples with sticky sessions configuration fot this module for tomcat backends.
On Mar 12, 2012 6:19 PM, "Kashif Rahman" <> wrote:
Thanks Anam, but we are looking at to use mod proxy for Apache/Tomcat Communication and session
persistence. Can it be done using our requirement?
Thank you,
Kashif Rahman.
From:Anam Ali Khan [] 
Sent: Friday, March 09, 2012 7:44 PM
Cc: Kashif Rahman
Subject: Re: [users@httpd] Apache + Tomcat Load Balancing
I would recommend HAProxy as a load balancer in your PHP + JSP application environment. It
will work as follows:
1. First HAProxy will accept client request.
2. It will forward those requests to two machines via round robin 
3. Each WebServer must use mod_jk as a connector (module) for Apache/Tomcat communication
and session persistence.
4. HAproxy also perform health checking for two servers.


From:Kashif Rahman <>
Sent: Friday, 9 March 2012, 11:36
Subject: [users@httpd] Apache + Tomcat Load Balancing
We have requirement for to load balance our PHP + JSP application. I need to know that how
can I load balance 2 Apache web Servers and 2 Tomcat Servers, 1st Web Server + Tomcat on 1st
machine and 2nd Web Server + Tomcat on 2nd machine. We want to use Proxy Load Balancer for
Apache to tomcat communication.
If we use single Apache Web Server and 2 tomcat instances on different machines, it seems
to be working and sharing session fine, but when we add 2nd apache web server to have fail
over for PHP too, tomcat stops replicating session? If anyone is running such type of setup
then kindly do let me know what could be the issues or anything missing. I am using Apache
WebServer as a load balancer for both Apache too.
Apache Webserver
_____ |______
|                              |
Apache Webserver   Apache Webserver
|                              |
       Tomcat                   Tomcat        
What could be the recommended solution for this requirement?
Thank you,
Best Regards,
Kashif Rahman
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