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Cris,

On 12/15/17 1:23 PM, Berneburg, Cris J. - US wrote:
> Chris
> 
> Thanks for taking the time to explain this to me.  I'm still trying
> to absorb it all.  More below.
> 
>>> My question is this.  Is it even possible or simply not
>>> recommended for both tomcat instances to share the same
>>> CATALINA_BASE?  The work folder with compiled cache is buried
>>> in CATALINA_HOME, not under webapps, right?  It also assumes
>>> that no changes need to be made to the application code or
>>> web.xml to accommodate the newer tomcat version.  If changes
>>> need to be made for the new version, then the whole issue
>>> becomes moot.
> 
>> So I would recommend a separate CATALINA_BASE for each
>> application's support for a major Tomcat version. Note that you
>> are welcome to share WAR files for an application.
>> 
>> Example:
>> 
>> Tomcat 6 CATALINA_BASE: bin/setenv.sh conf/server.xml 
>> conf/context.xml conf/web.xml 
>> conf/Catalina/localhost/mywebapp.xml [ references
>> C:\apps\myapp.war ]
>> 
>> Tomcat 8.5 CATALINA_BASE bin/setenv.sh conf/server.xml 
>> conf/context.xml conf/web.xml 
>> conf/Catalina/localhost/mywebapp.xml [ references
>> C:\apps\myapp.war ]
>> 
>> In this way, your CATALINA_BASE directory only contains a handful
>> of configuration files (plus the work/ directory, but you let
>> Tomcat worry about that).
> 
> We host multiple apps.  So each app instance would require its own
> CATALINA_BASE for each instance of Tomcat?  This is beginning to
> sound like a matrix nightmare.  :-)

It's just more XML files. They will often look the same.

>> If you update your WAR file, both services will be updated with
>> your latest code.
> 
> We don't (yet) use WAR files, but rather exploded directories.  In
> your example, can conf/Catalina/localhost/mywebapp.xml reference
> C:\apps\myapp (folder)?

Definitely. The only situation I think where Tomcat cares about the
difference between a WAR file and an exploded WAR directory structure
is when using the manager to deploy an application: you must deploy a
WAR file and can't upload a directory structure. Otherwise, those two
entities are entirely interchangeabile.

- -chris

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