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From Don Hill <>
Subject [users@httpd] Re: httpd mod_jk cluster
Date Tue, 28 Dec 2010 14:18:13 GMT
What I really want to know is there a better design that I should use to
gain performance. for example

1.) create multiple HTTPD servers, 2 servers per machine. Each serving 2
tomcats JVM
2.) use load balancer in workers to handle the load balance to the JVM's.
The current configuration is balancing through the vhosts and each vhost has
a worker for a JVM instance.

On Mon, Dec 27, 2010 at 9:05 PM, Don Hill <> wrote:

> Hi.
> I am working on a tomcat 5.5 cluster which is using ajp/1.3 and mod_jk and
> trying to determine the best cluster design given the hardware. I have 2
> xeon 2.3 ghz 2 CPU machines with 38GB ram machine. Currently here is the
> config I am using. The TOMCAT and HTTPD servers are on the same physical
> machine.
> Each machine is running HTTPD 1.3 with prefork, the MaxClients is 256 due
> compiled in limits. Each machine has 4 virtualhosts running through one
> instance of HTTPD. Two of the VHOSTS are the same app running on 2 Tomcat
> 5.5 with 8GB RAM(configured by customer). The workers are configured to each
> VHOST meaning for each machine there are 4 workers defined and one worker
> is defined for each VHOST. I will try and depict this below. The current
> load balancing is controlled by F5 and manages the load across 2 machines, 4
> VHOST for each app.
> Based on this info can someone recommend if this configuration could be
> improved and if so what would you recommend ?
> Attached is a pic of the cluster
> Thanks for any help on this.

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