Intro to Tomcat's management in Linux

1. In Linux, Tomcat can be typically installed at a few possible location such as
   /usr/share/tomcat8
   /var/lib/tomcat8/
   /opt/tomcat8
   
   Note : At KWT server, Tomcat is installed at /var/lib/tomcat8/
   
   
   2. Tomcat has a few Environment Variables
   
   $CATALINA_HOME : where Tomcat is installed
   $CATALINA_BASE : same as CATALINA_HOME
   $CATALINA_PID : location of pid file for Tomcat running process (will discuss later)
   
   
   3. To start Tomcat, usually we can run : “$CATALINA_HOME/bin/catalina.sh start”
   
   
   4. Once Tomcat is running, the pid of the Tomcat process is writen into a file which is declared in $CATALINA_PID.
   Typically value for $CATALINA_PID is $CATALINA_BASE\bin\catalina.pid
   
   When you open this file, (run “less $CATALINA_BASE\bin\catalina.pid”), you will see the pid of the Tomcat process
   
   
   5. You stop Tomcat process by running : “kill -kill 1239” (replace 1239 with the pid of the process)
   This is a generic Linux’s way of killing any process.
   
   
   6. Typically, to stop Tomcat, you run “$CATALINA_HOME/bin/shutdown.sh start”
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   NOTE : To add more : Logging, folder structure, manager, host manager, multiple instance, users, server setting</div>