Like the example in the book, I created a file called "proxy-balancer.conf"
and put it in the "conf.d" directory. Here is what the file looks like (I
retyped it so there may be mistakes):
<IfModule !proxy_module>
LoadModule proxy_module modules/mod_proxy.so
</IfModule>
# <IfModule !proxy_ajp_module>
# LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
# </IfModule>
<IfModule !proxy_http_module>
LoadModule proxy_http_module modules/mod_proxy_http.so
</IfModule>
<IfModule !proxy_balancer_module>
LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
</IfModule>
<IfModule !status_module>
LoadModule status_module modules/mod_status.so
</IfModule>
<IfModule !proxy_balancer_module>
ProxyRequests Off
<Proxy balancer://tccluster>
BalancerMember http://192.168.1.101:8080 loadfactor=1 max=150 smax=145
BalancerMember http://192.168.1.102:8080 loadfactor=1 max=150 smax=145
BalancerMember http://192.168.1.103:8080 loadfactor=1 max=150 smax=145
Order Deny,Allow
Allow from all
</Proxy>
<Location /balancer-manager>
SetHandler balancer-manager
Order Deny,Allow
Allow from all
</Location>
<Location /my-webapp>
ProxyPass balancer://tccluster/my-webapp stickysession-jsessionid
ProxyPassReverse balancer://tccluster/my-webapp
Order Deny,Allow
Allow from all
</Location>
<Location /examples>
ProxyPass balancer://tccluster/examples stickysession-jsessionid
ProxyPassReverse balancer://tccluster/examples
Order Deny,Allow
Allow from all
</Location>
</IfModule>
________________________________________
From: Filip Hanik - Dev Lists [devli...@hanik.com]
Sent: Tuesday, March 10, 2009 11:29 AM
To: Tomcat Users List
Subject: Re: Need Hellp With Tomcat 6 / Apache 2.2 Cluster Problem
what does the cluster section of your httpd look like?
Alston, Brian (US SSA) wrote:
> I have one Apache http server version 2.2.3 (on Red Hat Enterprise Linux 5)
> and three Tomcat 6 version 6.0.18 servers (on Windows Server 2003) running in
> my cluster. Everything "appears" to be working well. It looks like it is
> using RoundRobin because every time I refresh the page it goes from web001 ->
> web002 -> web003 -> web001 -> etc. I used some of the examples that are
> provided with Tomcat in the "examples" directory - specifically the
> "Sessions" servlet and it looks like my sessions are staying the same and
> holding information. My issue is this. When I stop one of the Tomcat servers
> (let's say web002), I will sometimes get the following error message when I
> refresh the page:
>
> - - - - - - - - - -
>
> Proxy Error
>
> The proxy server received an invalid response from an upstream server.
> The proxy server could not handle the request GET /examples/instance.html.
>
> Reason: Error reading from remote server
>
> Apache/2.2.3 (Red Hat) Server at 150.37.0.20 Port 80
>
> - - - - - - - - - -
>
> I don't receive this error message every single time I refresh the page but I
> do get it often. It looks like Apache http server is still trying to access
> the Tomcat server web002 even though it is down. Does this sound like I have
> an incorrect configuration to anybody or is this normal? I would not think
> that it was normal, as clustering is supposed to prevent errors like this.
>
> I have been following the examples in the O'Reilly book "Tomcat: The
> Definitive Guide" in chapter 10 - "Tomcat Clustering".
>
> Any help anybody can provide will be greatly appreciated.
>
> Thank you for reading, have a good day.
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>
>
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