Tomcat – How to monitor tomcat application and restart if not running

tomcat

I have a web application running on Tomcat and would like to have an automated way of monitoring the application to ensure it is running, and if not start/restart tomcat (and also send an email alert). I'd like to do more than just check that Tomcat is running and ensure that a default page from the application can be loaded.

Is there any tool that would be best to do this, aside from writing a shell script and running it as a cron job?

Best Answer

Please look into the Monit utility.

This is a daemon and process-watching tool and can provide the alerts and defined actions that you may need.

A quick example:

check process tomcat with pidfile "/var/run/tomcat/tomcat.pid"
  start program = "/usr/local/tomcat/bin/startup.sh" as uid tomcat gid tomcat
  stop program = "/usr/local/tomcat/bin/shutdown.sh" as uid tomcat gid tomcat
  if failed port 8080 then alert
  if failed port 8080 for 5 cycles then restart

Related Solutions

Windows – How to configure TomCat Java options in a config file

If you're using Tomcat as a Windows service, you can adjust the JVM options by going to the bin dir and running:

tomcat6 //US//MYSERVICENAME ++JvmOptions=-Dexample.license.directory="C:\Program Files\example"

Turn the service off before you do this and restart it when you finish.

I just did this for my own tomcat server and it handled it for me.

Tomcat – Cron shell script to restart Tomcat

This is a rough outline of a script that would do what you want. Of course, you'll have to flesh it out and you can change the argument to sleep (shown here as five seconds).

#!/bin/bash
while ps | grep | grep > /dev/null
do
    sleep 5
done
kill
restart

You can combine the two greps into one using a regular expression if necessary. Note: when you are doing this sort of thing, you can sometimes get false positives when grep finds itself (although your two greps prevent this). In order to avoid that, you can do grep [s]omething which will find "...something..." but not "grep something" in the output of ps.

Best Answer

Related Solutions

Windows – How to configure TomCat Java options in a config file

Tomcat – Cron shell script to restart Tomcat

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