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From: Peter Crowther <Peter.Crowther@melandra.com>
To: 'Tomcat Users List' <users@tomcat.apache.org>
Date: Tue, 9 Sep 2008 08:13:54 +0100
Subject: RE: [NEWBIE] Separate tomcat engines on the same physical server
Thread-Topic: [NEWBIE] Separate tomcat engines on the same physical server
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> From: Jon Camilleri [mailto:camilleri.jon@gmail.com]
> Hence, is it feasible to have:
>
> - Server 1 installed with Tomcat instance #1 and
> Tomcat instance #2 over JVM #1
>
> - Server 2 installed with Tomcat instance #1 and
> Tomcat instance #2 over JVM #2

If by JVM you mean "the files installed to support Java on the computer", y=
es.  One Java installation can support many concurrent processes running Ja=
va.

If by JVM you mean "one process running Java", no.  Each Tomcat must run in=
 its own process.

> What are your views on this?

I've successfully run up to three Tomcats on the same machine, as three pro=
cesses, all with the same JAVA_HOME.  It's a good way of providing isolatio=
n between applications, or even Tomcat versions (I was running two 5.0.x, o=
ne 5.5.x).

> Any relevant documentation on configuring them this way?

See the file RUNNING.txt in the Tomcat zip you download.  There's a section=
 at the end on running multiple Tomcats on the same box.  Setup can get a l=
ittle interesting if you're running on Windows and want both processes to s=
tart as services, but even that's entirely possible to configure.

                - Peter

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