Determine process id
First we determine the process id(s) of the running Tomcat instance(s).
We can grep the running process list for ‘catalina.home’:
pgrep -f 'catalina.home'
This might yield more than one pid.
Or we can search by port (8080 is the default, adjust if necessary). The following commands will likely require root privileges:
lsof -t -i :8080
Alternatively, for example if lsof is not installed:
Or yet another way, using netstat (or its “ss” replacement):
netstat -nlp | grep 8080
ss -nlp | grep 8080
For the process id(s) determined above, we look at process details:
ps -o pid,uid,cmd -p [pidlist] | cat
For each specified pid, this shows the uid (system user) and the full command line of the process.
Typically the command line will contain something like “-Dcatalina.home=[path]” and that path is the catalina.home system property of the Java process.
Alternatively – with Java 7 and later – we can use the JDK command “jcmd” to query the JVM process for its system properties:
sudo -u [uid] jcmd [pid] VM.system_properties \ | grep '^catalina.home' \ | cut -f2 -d'='
Now we can finally determine which Tomcat version is installed under the catalina.home path:
[catalina.home]/bin/catalina.sh version \ | grep '^Server number:'
Note: Please replace
[catalina.home] with the path you determined above.
The final output should be something like this:
Server number: 184.108.40.206