Check if Tomcat is running via shell script - shell

Question

I need to check if Tomcat is running in my system via a shell script. If not I need to catch the process id and kill Tomcat. How shall it be achieved?

Answer 1

in order to get the running process, I've used this command:
ps x | grep [full_path_to_tomcat] | grep -v grep | cut -d ' ' -f 1
You have to be careful, though. It works on my setup, but it may not run everywhere... I have two installations of tomcat, one is /usr/local/tomcat on port 8080 and /usr/local/tomcat_8081 on port 8081. I have to use '/usr/local/tomcat/' (with the final slash) as the full_path because otherwise it would return 2 different pids if tomcat_8081 is running as well.
Here's the explanation of what this command does:
1) ps x gives you a list of running processes ordered by pid, tty, stat, time running and command.
2) Applying grep [full_path_to_tomcat] to it will find the pattern [full_path_to_tomcat] within that list. For instance, running ps x | grep /usr/local/tomcat/ might get you the following:
13277 ? Sl 7:13 /usr/local/java/bin/java -Djava.util.logging.config.fil
e=/usr/local/tomcat/conf/logging.properties [...] -Dcatalina.home=/usr/local/tomca
t [...]
21149 pts/0 S+ 0:00 grep /usr/local/tomcat/
3) As we get 2 entries instead of one due to the grep /usr/local/tomcat/ matching the pattern, let's remove it. -v is the invert-match flag for grep, meaning it will select only lines that do not match the pattern. So, in the previous example, using ps -x | grep /usr/local/tomcat/ | grep -v grep will return:
13277 ? Sl 7:13 /usr/local/java/bin/java -Djava.util.logging.config.fil
e=/usr/local/tomcat/conf/logging.properties [...] -Dcatalina.home=/usr/local/tomca
t [...]
4) Cool, now we have the pid we need. Still, we need to strip all the rest. In order to do that, let's use cut. This command removes sections from a FILE or a standard output. The -d option is the delimiter and the -f is the field you need. Great. So we can use a space (' ') as a delimiter, and get the first field, which corresponds to the pid. Running ps x | grep /usr/local/tomcat/ | grep -v grep | cut -d ' ' -f 1 will return:
13277
Which is what you need. To use it in your script, it's simple:
#replace below with your tomcat path
tomcat_path=/users/tomcat/apache-tomcat-8.0.30
pid=$(ps x | grep "${tomcat_path}" | grep -v grep | cut -d ' ' -f 1)
if [ "${pid}" ]; then
eval "kill ${pid}"
fi

Answer 2

One way to check by using wget for your server address and checking the status.
Check this link here :
http://www.velvettools.com/2013/07/shell-script-to-check-tomcat-status-and.html#.VX_jfVz-X1E
TOMCAT_HOME=/usr/local/tomcat-folder/
is_Running ()
{
wget -O - http://yourserver.com/ >& /dev/null
if( test $? -eq 0 ) then
return 0
else
return 1
fi
}
stop_Tomcat ()
{
echo "shutting down......"
$TOMCAT_HOME/bin/shutdown.sh
}
start_Tomcat ()
{
echo "starting......"
$TOMCAT_HOME/bin/startup.sh
}
restart ()
{
stop_Tomcat
sleep 10
kill_Hanged_Processes
start_Tomcat
sleep 60
}

Answer 3

the easy way to do that is :
ps -ef | grep tomcat
by using this command you'll get :
user [id-to-kill] Date [tomcat-path]
last step is killing the process
sudo kill -9 [id-to-kill]
Congratulation, your process was killed lOol

Answer 4

Tomcat's default port is 8080. u can grep it and use port status in comparision loop.
#!/bin/bash
STAT=`netstat -na | grep 8080 | awk '{print $7}'`
if [ "$STAT" = "LISTEN" ]; then
echo "DEFAULT TOMCAT PORT IS LISTENING, SO ITS OK"
elif [ "$STAT" = "" ]; then
echo "8080 PORT IS NOT IN USE SO TOMCAT IS NOT WORKING"
## only if you defined CATALINA_HOME in JAVA ENV ##
cd $CATALINA_HOME/bin
./startup.sh
fi
RESULT=`netstat -na | grep 8080 | awk '{print $7}' | wc -l`
if [ "$RESULT" = 0 ]; then
echo "TOMCAT PORT STILL NOT LISTENING"
elif [ "$RESULT" != 0 ]; then
echo "TOMCAT PORT IS LISTENINS AND SO TOMCAT WORKING"
fi
this way you can compare the script.you grep port 8080 if you are using the default port for tomcat.this will only check whether tomcat is running.
then you can check the processes using the port
lsof -i:8080 //if using port 8080
the if you want to free the port by killing the process using it use this command
kill 75782 //if for instance 75782 is the process using the port