> From: Robert P. J. Day [mailto:rpj...@crashcourse.ca] 
> Subject: what exactly does it mean to run multiple tomcat "instances"?

> i can see how multiple users could share a common CATALINA_HOME
> directory, whose only common contents would be the bin/ and lib/
> directories.  but how would individual users take advantage of that?

This has nothing to do with users, but rather with running multiple Tomcat 
servers on a single machine.  For example, you may want to segregate webapps 
more than you can inside a single JVM, thus avoiding the potential of one 
misbehaving webapp taking the whole set down.

> if i change that server port to, say, 8081, i'm just going to 
> run into another conflict on port 8009.

Yes, each ip-address/port combination must be unique for each instance of 
Tomcat.  This is true for any server-like program, not just Tomcat.

> so if i want to run an entirely separate tomcat instance, don't i
> have to modify server.xml

Yes - each instance must have its own.

 - Chuck


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