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From <Mohit.G...@rbs.com>
Subject RE: Tomcat
Date Wed, 06 Feb 2013 10:07:52 GMT
Hi
 
Regrets for the wrong framing of question.
Actually I am new to tomcat and what I really want to do is run on the same server two different
tomcats so that one doesn't interfere with the working of the other.
As I have different environments so I want that the tomcat running in my development environment
do not access the files of my SIT environment and vice-versa. That's why I want to have a
separate tomcat process for each host.
If I just change the port in the config file the request will be mapped but the various environments
will have access to all the files as it will be present in the common directory.

-----Original Message-----
From: André Warnier [mailto:aw@ice-sa.com] 
Sent: 06 February 2013 15:30
To: Tomcat Users List
Subject: Re: Tomcat

Mohit.Garg@rbs.com wrote:

> Hi
> 
> I am using a tomcat server on a Linux machine.
> Is there any way I can run multiple instances of apached daemon process so that if daemon
for environment A do not have access to files for environment B.
> In short I want to run multiple daemon processes.
> 

Hi. No offense but the way you are asking your question tends to suggest that you have a limited
understanding of how this stuff works. Here are some pointers :

You seem to be talking about 2 different products :
1) Apache httpd : is a general purpose webserver, made by people who belong to the Apache
httpd project (see : httpd.apache.org)
2) Apache Tomcat : is also a webserver, but mainly a "java servlet container", designed primarily
to run web applications written in java.  It is made by other people who belong to the Apache
Tomcat project (see : tomcat.apache.org)

(And see "www.apache.org" for what "Apache" really is).

Either one of Apache httpd or Apache tomcat can act as a webserver, serve static content and
run web applications.
They can also work in combination, with Apache httpd acting as a front-end to one or more
Tomcat servers.  If the client browsers always access the front-end Apache httpd server, and
the front-end Apache httpd server then distributes the work to several back-end tomcat servers,
this is called "proxying" and/or "load balancing".  There are also other programs (or hardware
boxes) that can act as "proxy" and/or "load-balancer".

In both cases (Apache httpd or tomcat), you /can/ run several instances on a same host. 
It is only a matter of configuration.
Generally-speaking however, if the problem is that one instance is not enough to support the
load that is put on it, multiplying the instances on the same host will not help.
You will need either to improve your applications (so that they respond better), or use a
bigger machine, or multiply the hosts and divide the load between them (using a load-balancing
configuration).

If the question is about separating the documents or applications into several independent
"domains", so that one "website" does not have access to the data of another website, then
in both cases the solution may be to run one single instance, but use what is know as "virtual
hosts" (where one instance responds to several hostnames, each having its own documents and
applications).

So now, would you like to rephrase your question more precisely ?

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