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From Igor Cicimov <icici...@gmail.com>
Subject Re: [users@httpd] Apache + Tomcat Load Balancing
Date Sat, 17 Mar 2012 03:37:51 GMT
Ok lets summarize, you have one apache load balancing the two backend
apaches which are load balancing the two backend tomcat servers. I
personally can't see any fault in this line up or your apache proxy
configuration and no reason really why would tomcat cluster session
replication stop working . Maybe has to do something with the first apache?
How is that one configured? Although the worker/tomcat name will always be
in the client cookie and doesn't really matter which one of the two apaches
will handle the request. Assuming they both have identical proxy balancer
configuration...have you checked that?

Also did you enabled the extra logging as per the link I sent? That should
help you in the troubleshooting, without knowing what exactly is in the
requests you can't do much can you? Also didn't answer if there are any
errors in the apache logs?


On Fri, Mar 16, 2012 at 7:36 PM, Kashif Rahman <kashif.rahman@vopium.com>wrote:

> Actually we are load balancing tomcat too.****
>
> ** **
>
> Thank you,****
>
> ** **
>
> Best Regards,****
>
> *
> Kashif Rahman*
>
> Principal SCM Engineer****
>
> [image: Description: vopium_signature_logo]****
>
> ** **
>
> Vopium A/S | Office# 2, 7th Floor, Shaheen Complex | 38 Abbot Road****
>
> Lahore | Pakistan |* **t* + 92 42 6316491 |* **f* + 92 42 6316492****
>
> * *
>
> [image: Description: imagesCAV9FMB1] + 92 334 9771227 | [image:
> Description: imagesCAXWPPLS] kashif_r | *w*  www.vopium.com****
>
> ** **
>
> *From:* Anam Ali Khan [mailto:anamalikhan@yahoo.com]
> *Sent:* Thursday, March 15, 2012 10:16 PM
> *To:* users@httpd.apache.org
>
> *Subject:* Re: [users@httpd] Apache + Tomcat Load Balancing****
>
> ** **
>
> 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@yahoo.com>
> *To:* "users@httpd.apache.org" <users@httpd.apache.org>
> *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@gmail.com>
> *To:* users@httpd.apache.org
> *Sent:* Wednesday, 14 March 2012, 14:48
> *Subject:* RE: [users@httpd] 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@vopium.com> wrote:
> ****
>
> Yes I have that same in server.xml on both tomcats.****
>
>  ****
>
> Thank you,****
>
>  ****
>
> Best Regards,****
>
> Kashif Rahman****
>
>  ****
>
> *From:* Igor Cicimov [mailto:icicimov@gmail.com]
> *Sent:* Wednesday, March 14, 2012 2:21 PM
> *To:* users@httpd.apache.org
> *Subject:* RE: [users@httpd] 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@vopium.com> 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@gmail.com]
> *Sent:* Monday, March 12, 2012 2:12 PM
> *To:* users@httpd.apache.org
> *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" <kashif.rahman@vopium.com> 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@yahoo.com]
> *Sent:* Friday, March 09, 2012 7:44 PM
> *To:* users@httpd.apache.org
> *Cc:* Kashif Rahman
> *Subject:* Re: [users@httpd] 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@vopium.com>
> *To:* users@httpd.apache.org
> *Sent:* Friday, 9 March 2012, 11:36
> *Subject:* [users@httpd] 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, 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 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****
>
>  ****
>
> ** **
>
> ** **
>

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