[tomcat] CATALINA_HOME vs CATALINA_BASE

https://tomcat.apache.org/tomcat-8.5-doc/introduction.html#CATALINA_HOME_and_CATALINA_BASE

CATALINA_HOME and CATALINA_BASE

Throughout the documentation, there are references to the two following properties:

• CATALINA_HOME: Represents the root of your Tomcat installation, for example /home/tomcat/apache-tomcat-9.0.10 or C:\Program Files\apache-tomcat-9.0.10.
• CATALINA_BASE: Represents the root of a runtime configuration of a specific Tomcat instance. If you want to have multiple Tomcat instances on one machine, use the CATALINA_BASE property.

If you set the properties to different locations, the CATALINA_HOME location contains static sources, such as .jar files, or binary files. The CATALINA_BASE location contains configuration files, log files, deployed applications, and other runtime requirements.