[Building Sakai] Sakai load balancing (self fires requests like machne gun).
Nuno Fernandes
nuno at ufp.edu.pt
Mon Mar 23 02:41:04 PDT 2009
Hi Ahmed,
We are also using mod_proxy_ajp both in development and production servers.
The configuration looks much like yours, but we use ProxyPassMatch instead
of ProxyPass:
ProxyPassMatch /* balancer://sakaiCluster stickysession=JSESSIONID
nofailover=on maxattempts=2
<Proxy balancer://sakaiCluster>
BalancerMember ajp://localhost:8009 loadfactor=15 route=elearning-a
BalancerMember ajp://localhost:9009 loadfactor=20 route=elearning-b
redirect=elearning-c status=D
BalancerMember ajp://10.11.100.162:10009 loadfactor=40
route=elearning-c
BalancerMember ajp://10.11.100.162:11009 loadfactor=40
route=elearning-d
</Proxy>
(In this case, node B is disabled)
And, for the content we don't want to be catched by tomcat:
ProxyPass /balancer-manager !
ProxyPass /wiki !
(and so on)
Do you have any redirections in httpd configuration (using mod_rewrite, for
example?) that may be interfering?
Hope it helps,
Nuno
2009/3/22 Ahmed Dini <asdini at hotmail.com>
>
> Thanks Aaron for the reply.
>
> I am still having the problem, I thought I was using load balancing with
> sticky sessions enabled. Below is what I did so far.
>
> *In apache httpd.properties*
>
> I enabled:-
> LoadModule proxy_module modules/mod_proxy.so
> LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
> LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
>
> *In this same file I also included:-*
> **
> ProxyPass / balancer://sakaiCluster/ stickysession=JSESSIONID nofailover=On
> lbmethod=bytraffic
> <Proxy balancer://sakaiCluster>
> BalancerMember ajp://localhost:18009 route=tomcat1
> BalancerMember ajp://localhost:28009 route=tomcat2
> </Proxy>
> <Location /manager>
> SetHandler balancer-manager
> Order deny,allow
> Deny from all
> Allow from 127.0.0.1
> </Location>
>
> *In the server.xml of tomcat1*
>
> <Server port="18005" shutdown="SHUTDOWN">
>
> <!-- Define a non-SSL HTTP/1.1 Connector on port 8080 --> this might
> not be relevant but i just enabled
> <Connector port="18080" maxHttpHeaderSize="8192"
> maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
> enableLookups="false" redirectPort="8443" acceptCount="100"
> connectionTimeout="20000" disableUploadTimeout="true" />
>
> <Connector port="18009"
> enableLookups="false" redirectPort="8443" protocol="AJP/1.3"
> />
>
> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
>
> *In the server.xml of tomcat2*
> **
> <Server port="28005" shutdown="SHUTDOWN">
> * *
> <Connector port="28080" maxHttpHeaderSize="8192"
> maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
> enableLookups="false" redirectPort="8443" acceptCount="100"
> connectionTimeout="20000" disableUploadTimeout="true" />
>
> <Connector port="28009"
> enableLookups="false" redirectPort="8443" protocol="AJP/1.3"
> />
>
> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
>
> *In addition to That I am also getting warning in the console of one of
> the tomcat instances.*
>
> WARN: run(): ghost-busting server: Bar Ama Baro-1237730244240 from : Bar
> Ama Baro 1237737377592 <2009-03-22 15:47, 35
> SakaiClusterService.Mainatanance_org.Sakaiproject.cluster.impl.SakaiClusterService>
>
> I also attached few lines from the apache/logs/Access produced from a
> single request in the browser. All I did, was type the url and hit enter.
> and it sent requests continuesly. I am thinking that this is all
> happening within second (please look at the time stamp).
>
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-120?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal/tool/!gateway-110?panel=Main
> HTTP/1.1" 200 678
> [22/Mar/2009:16:47:28 +0000] "GET /portal HTTP/1.1" 200 7357
>
>
>
> > Date: Sun, 22 Mar 2009 08:32:14 +0000
> > Subject: Re: [Building Sakai] Sakai load balancing (self fires requests
> like machne gun).
> > From: aaronz at vt.edu
> > To: asdini at hotmail.com
> > CC: sakai-dev at collab.sakaiproject.org
>
> >
> > Sounds like you are using a round-robin strategy when you need to be
> > using a sticky-session strategy for load balancing. Try that and see
> > if it fixes it.
> > -AZ
> >
> >
> > On Sun, Mar 22, 2009 at 5:27 AM, Ahmed Dini <asdini at hotmail.com> wrote:
> > > Hello, Everybody,
> > >
> > >
> > >
> > > I have finished integrating Apache with tomcat. I have two instances
> of
> > > Tomcat running on my machine and I am trying to load balance the two
> > > instances using mod_proxy_ajp.
> > >
> > >
> > >
> > > The problem is, if I run one instance of tomcat, everything works fine.
> But
> > > when I run the second tomcat and access it through
> > > http://localhost/ apache's url, the gateway page of Sakai starts
> flushing as
> > > if it is firing requesting like a machine gun to apache. I can't click
> on
> > > any link because it is flushing so fast.
> > >
> > > To see if the problem has something to do with my load balancing, I
> have
> > > placed two static index.html files in the Webapp/ROOT directories of
> both
> > > tomcat instances, but, it worked fined. it doesn't flush this time, and
> > > every time I refresh manually it shows the index pages in turns. My
> guess of
> > > the problem is that my sakai load balancing settings are not correct,
> but i
> > > don't know where i can set them. I could not find any thing in the
> > > sakai.properties file. Remeber if I shutdown one of the tomcat
> instances the
> > > remaining one works, both will work, it doesn't matter which one I
> close.
> > >
> > >
> > >
> > > I have tried all versions of tomcat, 5.5.26 and 5.5.27 with both sakai
> 2.5.4
> > > and 2.6.0-beta-3.
> > >
> > >
> > >
> > > Please Help.
> > > ________________________________
> > > Windows Live just got better. Find out more!
> > > _______________________________________________
> > > sakai-dev mailing list
> > > sakai-dev at collab.sakaiproject.org
> > > http://collab.sakaiproject.org/mailman/listinfo/sakai-dev
> > >
> > > TO UNSUBSCRIBE: send email to
> sakai-dev-unsubscribe at collab.sakaiproject.org
> > > with a subject of "unsubscribe"
> > >
> > >
> >
> >
> >
> > --
> > Aaron Zeckoski (aaronz at vt.edu)
> > Senior Research Engineer - CARET - Cambridge University
> > [http://bugs.sakaiproject.org/confluence/display/~aaronz/]
> > Sakai Fellow - [http://aaronz-sakai.blogspot.com/]
>
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--
Nuno Fernandes [www.linkedin.com/in/nfgrilo]
Software Developer - UFP-UV [Universidade Virtual]
Software Developer - Sakai Foundation [sakaiproject.org]
Sakai Fellow 2008 - Sakai Foundation [
confluence.sakaiproject.org/confluence/x/FIF9AQ]
Universidade Fernando Pessoa [www.ufp.pt]
Praça 9 de Abril, 349
4249-004 Porto
tel: + 351 22 507 13 00
fax: + 351 22 550 82 69
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