Here what I have used :
==================
ProxyRequests Off
<Proxy
*>
AddDefaultCharset Off
Order deny,allow
Allow from all
</Proxy>
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://127.0.0.1:8009 route=tomcat1 disablereuse=On
BalancerMember ajp://x.x.x.x:8009 route=tomcat2 disablereuse=On
ProxySet lbmethod=byrequests
</Proxy>
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,
Regards,
Kashif Rahman.
From: Igor Cicimov [mailto:icicimov@xxxxxxxxx]
Sent: Monday, March 12, 2012 2:12 PM
To: users@xxxxxxxxxxxxxxxx
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.
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,
Regards,
Kashif Rahman.
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.
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
What could be the recommended solution for this requirement?
Best Regards,
Kashif Rahman
