What is the tomcat catalina_pid variable used for?
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Environment variable: CATALINA_PID
Setting: optionalFrom Apache Tomcat documentation:
https://tomcat.apache.org/tomcat-9.0-doc/RUNNING.txtAnother frequently used variable is CATALINA_PID (on *nix only). It
specifies the location of the file where process id of the forked Tomcat
java process will be written. This setting is optional. It will enable the
following features:- better protection against duplicate start attempts and
- allows forceful termination of Tomcat process when it does not react to
the standard shutdown command.
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