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From Ed Young <...@summitbid.com>
Subject [users@httpd] Apache + 2 tomcat appserver failover configuration
Date Fri, 31 Aug 2012 01:13:40 GMT
I've set up a load balancing configuration based on an Apache server
and two tomcats Tomcat6A, and Tomcat6B. I'm trying to set it up so
that Tomcat6B is a failover server, so if Tomcat6A goes down, Tomcat6B
will handle all subsequent requests.

I have two questions:
1. Does mod_proxy use the workers.properties file? It doesn't seem to
make any difference what is in workers.properties.
2. How can I set this system up for a failover configuration?

This is killing me. I'm using mod_proxy, mod_proxy_balancer, mod_ajp.

In the load balancer howto, it specifies the configuration I want by
using the workers.properties file, but that file seems to have no
effect on the system behavior. I wonder if it was written before
mod_proxy became a replacement for mod_jk.
_http://tomcat.apache.org/connectors-doc/generic_howto/loadbalancers.html

No matter what I do, if I shut down Tomcat6A, there is no failover
behavior. Existing Tomcat6A request fail (expected) and new requests
fail with 404. Only the existing Tomcat6B request continue.

Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/"
env=BALANCER_ROUTE_CHANGED
<Proxy balancer://cluster>
        BalancerMember ajp://chimps-lb-01.cable.bogus.com:8009 route=Tomcat6A
        BalancerMember ajp://chimps-lb-02.cable.bogus.com:8009 route=Tomcat6B
        ProxySet stickysession=ROUTEID
</Proxy>
ProxyPass / balancer://cluster/
ProxyPassReverse / balancer://cluster/

The configuration above alternates between each tomcat as request come
in, which is not what I want.

I created a workers.properties file in /etc/httpd/conf/, based on the
loadBalance Howto, but it does not seem to have any effect on the
system. Does mod_proxy use it?

worker.list=balance1

# The load balancer worker balance1 will distribute
# load to the members Tomcat6A, Tomcat6B
worker.balance1.type=lb
worker.balance1.balance_workers=Tomcat6A, Tomcat6B

worker.Tomcat6A.type = ajp13
worker.Tomcat6A.host = chimps-lb-01.cable.bogus.com
worker.Tomcat6A.port = 8009
worker.Tomcat6A.redirect=Tomcat6B
#worker.Tomcat6A.lbfactor = 10

worker.Tomcat6B.type = ajp13
worker.Tomcat6B.host = chimps-lb-02.cable.bogus.com
worker.Tomcat6B.port = 8009
worker.Tomcat6B.activation=disabled

Each tomcat server.xml has
 <Engine name="Standalone" defaultHost="localhost" jvmRoute="Tomcat6A">
or
 <Engine name="Standalone" defaultHost="localhost" jvmRoute="Tomcat6B">

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