I get you point . well we are using dynatrace to keep a track on how slow the server is serving pages and for the entire system metrics monitoring we are using monit and both are done externally . The firewall has closed all the outbound ports so wget is not possible.
Its just that we have to monitor the JVM so that it does not hang but yes you are right with dynatrace just has a monitoring window and it does not restart the service. So I have to come up with a cript also which how the system is serving pages if its to slow . then to restart the JVM . From: Darryl Lewis [mailto:darryl.le...@unsw.edu.au] Sent: Wednesday, September 22, 2010 6:12 PM To: Mendiratta, Shashank; Tomcat Users List Subject: Re: How ot monitor hung tomcat/apache processes? Are you trying to monitor from the same computer that tomcat is running on? That's not a good idea. What happens if the entire system crashes...you won't get any data/alerts. End to end uses another machine to monitor the first. You could monitor catalina.out for errors, but I don't think you'll capture every possibility. What would happen if the system stops serving pages (or serves them slow)? That won't show in the logs. What port is your application running on? You can use (from another machine) wget {servername}:8080. On 22/09/10 10:30 PM, "Mendiratta, Shashank" <shashank_mendira...@intuit.com> wrote: HI Darryl , Thanx , about that here the outbound port 80 is blocked so we cannot wget , moreover this wont solve the problem as to why the the services are getting hung. Well I had an idea, please critic it. Why not monitor the server.log file if we get some kind of error. We send an alert and then restart the service . Befire that we have to make a repository of types of error that can occur Please do comment Regards Shashank From: Darryl Lewis [mailto:darryl.le...@unsw.edu.au] Sent: Wednesday, September 22, 2010 5:54 PM To: Mendiratta, Shashank; Tomcat Users List Subject: Re: How ot monitor hung tomcat/apache processes? It depends on the application you are running, but a simple test would be to access the webpage (ensuring part of it is served from Tomcat, not apache) and check for an expected response. For example, a simple jsp page that prints out "ok" You can then do a wget, and check for that string. Cheers. On 22/09/10 10:13 PM, "Mendiratta, Shashank" <shashank_mendira...@intuit.com> wrote: Hi Darryl, Yes This is the same problem I am facing. Sorry I am kind of new to it but can you tell me what kind of end to end monitoring should I do ? Regards Shashank -----Original Message----- From: Darryl Lewis [mailto:darryl.le...@unsw.edu.au] Sent: Wednesday, September 22, 2010 5:38 PM To: Tomcat Users List Subject: Re: How ot monitor hung tomcat/apache processes? In my experience, the PID can still exist of tomcat but a Java heap crash has stopped it responding. Checking a PID will not check if the application is responding. You're better to do some sort of end to end monitoring On 22/09/10 10:03 PM, "Mendiratta, Shashank" <shashank_mendira...@intuit.com> wrote: Hi , I am working on a monitoring system to find out hung tomcat/apache processes . By this I mean if the PID exists and still the apache / tomcat is not responding that due to memory leak or variety of other reasons . Is their a tool to find this . Regards Shashank
