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From André Warnier>
Subject Re: Running two different version of tomcat on the same server
Date Thu, 22 Nov 2012 08:06:03 GMT
Kent Cole wrote:
> I did exactly that.  I have tomcat 6.0.26 as my current production.  I
> installed tomcat 7.0.32 to test my app on before migrating it.  I have the
> following environmental variable in both .bash_profile and .bashrc
> CATALINA_HOME=/var/apache-tomcat-6.0.26
> When I run ./ from tomcat 7.0.32 bin, it cannot locate the
> instance of tomcat 7.0.32.  What is the trick to get around this?  Should
> CATALINA_HOME=/var/apache-tomcat-6.0.26 reside in one of the startup
> scripts?

This is more about running shell scripts under Linux, as about Tomcat itself.

First, I presume that you know that by running ./ from the command-line, in your

own login session, you will be running Tomcat within your own shell environment and under

your own user-id.  That is likely to be different from the way your other installed Tomcat

is currently running.  There is nothing fundamentally wrong with this, just that you 
should be aware of the differences.

Second, what is missing above is probably an "export" of the shell environment variables 
which you set, like

export CATALINA_HOME=/var/apache-tomcat-6.0.26
CATALINA_HOME=/var/apache-tomcat-6.0.26; export CATALINA_HOME

If you do not do that, then the value of the CATALINA_HOME environment variable (in your 
current shell session), is not "passed on" to the shell instance running the ./

script.  The script thus starts with an empty or undefined CATALINA_HOME 
environment value, and in such a case it tries to determine one by itself, and may get the

wrong value.

Thirdly : if you follow what the script is doing, you'll see that it ends up 
running the script.  And this script runs the bin/ script if it 
exists.  That is the "best" place to define variables such as CATALINA_HOME and 
CATALINA_BASE, because this script will be run no matter who runs the script.
(In other words, if these variables are set in the script, then they do not 
depend on a value set in any specific user's login shell script.  Which of course may be 
what you want or not; but generally it is).

And fourthly : if you are installing Tomcat via your Linux distribution's packages and 
package manager, then all bets are off, because these packages redistribute Tomcat's files

according to their own logic, and include their own startup/shutdown scripts which may or

may not run the standard Tomcat startup/shotdown scripts, and may or may not set their own

set of environment variables and have their own conditional logic.
Not that these packages do not work. They generally do, and they simplify the work 
immensely when it comes to install and maintain production systems.  But each Linux 
distribution has its own logic for this, and it is difficult for people on this list to 
know exactly how each of these packages works and provide help for them in a case like yours.

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