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From "Kashif Rahman" <>
Subject RE: [users@httpd] Apache + Tomcat Load Balancing
Date Mon, 12 Mar 2012 10:17:29 GMT
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

        #ProxyPassReverse /kashif balancer://qawebcluster/kashif

        ProxyPass /kashif balancer://qawebcluster/kashif

        ProxyPassReverse /kashif balancer://qawebcluster/kashif

        ProxyPass /k balancer://qawebcluster/k

        ProxyPassReverse /k balancer://qawebcluster/k

       <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

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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