Re: Apache + Tomcat Load Balancing (Apache Users)

Why are you defining mod_proxy_balancer directives in WEB1 & WEB2. You only need to configure these in Apache Load Balancer machine.

Correct me if i am wrong.

-Anam

From: Anam Ali Khan <anamalikhan@xxxxxxxxx>
To: "users@xxxxxxxxxxxxxxxx" <users@xxxxxxxxxxxxxxxx>
Sent: Thursday, 15 March 2012, 22:13
Subject: Re: [users@httpd] Apache + Tomcat Load Balancing

Do not use session replication/sharing, use session stickiness instead.

-Anam

From: Igor Cicimov <icicimov@xxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx
Sent: Wednesday, 14 March 2012, 14:48
Subject: RE: Apache + Tomcat Load Balancing

What is in apache log file, any proxy errors? I would do some extra logging if i was you as given in the below link:

http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html#stickyness_troubleshooting

On Mar 14, 2012 8:28 PM, "Kashif Rahman" <kashif.rahman@xxxxxxxxxx> wrote:

Yes I have that same in server.xml on both tomcats.

Thank you,

Best Regards,

Kashif Rahman

From: Igor Cicimov [mailto:icicimov@xxxxxxxxx]
Sent: Wednesday, March 14, 2012 2:21 PM
To: users@xxxxxxxxxxxxxxxx
Subject: RE: Apache + Tomcat Load Balancing

Does the route parameters in the apache balancer tomcat1 and tomcat2 match the jvmRoute value in the tomcat connectors?
On Mar 12, 2012 9:19 PM, "Kashif Rahman" <kashif.rahman@xxxxxxxxxx> wrote:

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: 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" <kashif.rahman@xxxxxxxxxx> 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,

Regards,

Kashif Rahman.

From: Anam Ali Khan [mailto:anamalikhan@xxxxxxxxx]
Sent: Friday, March 09, 2012 7:44 PM
To: users@xxxxxxxxxxxxxxxx
Cc: Kashif Rahman
Subject: Re: Apache + Tomcat Load Balancing

Hi,

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.

-Anam

From: Kashif Rahman <kashif.rahman@xxxxxxxxxx>
To: users@xxxxxxxxxxxxxxxx
Sent: Friday, 9 March 2012, 11:36
Subject: Apache + Tomcat Load Balancing

Hi,

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, 1^st Web Server + Tomcat on 1^st machine and 2^nd Web Server + Tomcat on 2^nd 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 2^nd 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