Pradeep Phalgunan Kalliat wrote:
Hi All,
I've two webapps CoW and CoWTraining, each of which are load balanced by Apache
2.2.4 over two tomcat nodes running as services. i.e. two nodes for CoW and
two for the other. This is set up in one server machine. Both the webapps are
identical in functionality and operation but just that they are served by
different hosts.
The problem is that when I try to access CoWTraining in the same window after I
access CoW, the server throws a 'Service Temporarily Unavailable' message.
However, if I access CoWTraining first and then CoW, there are no problems.
Also in this case, if I go further and access CoWTraining again there are still
no problems. The error occurs only if I try to access CoWTraining in a window
in which I've accessed CoW. There are no problems trying to access other
applications in the same window.
The reason I think this is related to apache is because I had both these
webapps installed on one tomcat node and tested without the load balancing.
My httpd.conf file has the following references to these applications in the
same sequence.
--------------------------------------------------------------------------
<Location /CoW>
ProxyPass balancer://cluster-CoW/CoW
stickysession=JSESSIONID nofailover=On
ProxyPassReverse balancer://cluster-CoW/CoW
</Location>
<Location /CoWTraining>
ProxyPass balancer://cluster-CoWTraining/CoWTraining
stickysession=JSESSIONID nofailover=On
ProxyPassReverse balancer://cluster-CoWTraining/CoWTraining
</Location>
<Proxy balancer://cluster-CoW>
BalancerMember ajp://localhost:9209 route=tomcat70 retry=60 loadfactor=50
BalancerMember ajp://localhost:9309 route=tomcat71 retry=60 loadfactor=50
ProxySet lbmethod=bytraffic
</Proxy>
<Proxy balancer://cluster-CoWTraining>
BalancerMember ajp://localhost:9409 route=tomcat72 retry=60
loadfactor=50
BalancerMember ajp://localhost:9509 route=tomcat73 retry=60
loadfactor=50
ProxySet lbmethod=bytraffic
</Proxy>
RewriteEngine on
RewriteRule ^/CoW$ /CoW/ [R]
RewriteRule ^/CoWTraining$ /CoWTraining/ [R]
--------------------------------------------------------------------------
There are no errors in the tomcat logs. The apache logs have a lot of these
kind of errors
--------------------------------------------------------------------------
[error] (OS 10061)No connection could be made because the target machine
actively refused it. : proxy: AJP: attempt to connect to 127.0.0.1:9509
(localhost) failed
[error] (OS 10061)No connection could be made because the target machine
actively refused it. : proxy: AJP: attempt to connect to 127.0.0.1:9409
(localhost) failed
[error] ap_proxy_connect_backend disabling worker for (localhost)
[error] proxy: AJP: failed to make connection to backend: localhost
[error] proxy: BALANCER: (balancer://cluster-cowtraining). All workers are in
error state for route (tomcat73)
--------------------------------------------------------------------------
Any help would be greatly appreciated. I've already done a lot of googling with
not much results.
Hi.
That is a very good problem description.
Just to be complete, could you post also the content of the active
corresponding <Connector> tags of your Tomcat servers ?
(since they are apparently the side that refuses the connection).
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