-none- 2007-10-04 - By James Masson
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Hi list,
I have a fully working mod_jk High-Availability Tomcat environment at
the moment, and I'm looking to start catching web-app failures, as well
as Tomcat server failures.
At the moment, the service looks like this:
Two Alteon hardware load balancers
feeding
Two mod_jk apache servers
feeding
Four Tomcat 5.5 servers
I have at least six applications running on each identical Tomcat
instance, with the incoming connections balanced equally between the
four Tomcat servers.
The config is set up like this.
worker.list=app1,app2,app3,app4,app5
worker.tomcat1.port=8009
...
worker.tomcat2.port=8009
...
worker.tomcat3.port=8009
...
worker.tomcat4.port=8009
worker.app1.type=lb
worker.app1.balance_workers=tomcat1,tomcat2,tomcat3,tomcat4
worker.app2.type=lb
worker.app2.balance_workers=tomcat1,tomcat2,tomcat3,tomcat4
etc.
The applications themselves will return a 500-error if they encounter an
internal failure. I want to be able to detect this, and redirect around
the failing application instance.
I'm aware I can do this for the tomcat server worker, but using the
fail_on_status directive will take an entire server out of the cluster.
Using fail_on_status , there's a possibility that one misbehaving
web-app can destroy the whole environment!
Is there a way I can use mod_jk to redirect around a failed application
only, instead of taking out an entire server? Or am I misinterpreting
something?
I think this is possible if I create an AJP worker for each web-app on
each server - but that config will be ridiculously complex, and I'll
likely have problems with jvmRoute variables, and such.
Any ideas?
thanks
James Masson
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