Ed,
Answer to #1...
I do not believe that mod_proxy uses the workers.properties file. I'm currently using mod_proxy and mod_ajp successfully without using the workers.properties file. I'm using them in place of mod_jk, which does use the workers.properties file.
Answer to #2...
Have you tried looking into mod_rewrite any? You may need to redirect the request to Tomcat6B once A has failed. This should be made possible
Through mod_rewrite and setting up the rewrite conditions and rules in the httpd.conf.
-Isaac
-----Original Message-----
From: Ed Young [mailto:ejy@xxxxxxxxxxxxx]
Sent: Thursday, August 30, 2012 9:14 PM
To: users@xxxxxxxxxxxxxxxx
Subject: Apache + 2 tomcat appserver failover configuration
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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