Hello users: Thank you for all the answers. I have made some changes to my command: I added a space before the "&" character and I explicitly piped the "stdout" and "stderr" to my log file to avoid missunderstandings. The command looks like this now: nohup $JAVA_CMD -cp $CLASSPATH $JVM_OPTIONS JMXServer.JMXServerDispatcher $PORT </dev/null >>$LOG_FILE 2>>$LOG_FILE & The result however is much worst in this case, instead of seeing a timeout in the logs, the whole nagios process hangs (that is the logs freeze and no new tests are performed). I believe these issues have to do with how nagios handles the "&" character or processes in the background in general. Any thoughts? other suggestions? //Marco By the way David: We have used the check_jmx plugin in the past with out own modifications, however we have a very large system with around 1000 JMX queries running each 5 minutes and the check_jmx solution is not very scalable. If we use check_jmx that means starting 1000 JVM (and all the resources that come with it) every five minutes, that consumes a lot of resources and generates a lot of load on the monitoring server. Our system is continuously growing and new JMX queries are added quite frequently. To solve that issue we have developed a JMX server that takes care of all the JMX queries and a light weight client that is run by nagios. This is a much more scalable solution that decouples the whole JMX processing from nagios (the JMX server can be running in any machine not only the nagios server). Cheers <div class="gmail_quote">On Thu, Jul 2, 2009 at 4:43 PM, Marc Powell <<a href="mailto:marc@ena.com">marc@ena.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div class="im"> On Jul 2, 2009, at 9:16 AM, Marco Tirado wrote: > > That is exactly what I am doing (or trying to do with) the "&" > character at the end of my command. But it does not appear to be > working, the command looks like this: > > nohup $JAVA_CMD -cp $CLASSPATH $JVM_OPTIONS JMXServer $PORT </dev/ > null 2>&1 >> $LOG_FILE& </div>Do you really intend to set the output of /dev/null as the STDIN for nohup? I expect you meant to use '>/dev/null'. -- Marc <div><div></div><div class="h5"> ------------------------------------------------------------------------------ _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </div></div></blockquote></div>