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From Don Hill <>
Subject Re: Tomcat 5.5/HTTPD cluster question
Date Mon, 27 Dec 2010 16:42:53 GMT

I am trying to get them to migrate. It seems that part of there bottleneck
could be the MAX clients on HTTPD. They get high volumes at times and have
like 1800-3000 active sessions. Any other input would be great like tuning
tomcat to workers and the best strategy to setup a tomcat/httpd env.


On Mon, Dec 27, 2010 at 9:34 AM, André Warnier <> wrote:

> 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 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 ?
>>  The very first thing that I would recommend, would be to use the current
> versions of both httpd and tomcat.  The versions you mention above are
> several years old, and no longer being developed, except maybe for security
> patches.
> See :
> See :
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