Monitor Java Process

[Michael Gargiullo]

-----Original Message-----
From: Jatin Davey [mailto:jashokda at cisco.com] 
Sent: Wednesday, March 03, 2010 3:20 AM
To: Edwin Zoeller
Cc: Nagios Mailinglist
Subject: Re: [Nagios-users] Monitor Java Process

Hi Edwin

Did you mean that you are using the Process ID of the process running on

the remote box to monitor its status ?

Thanks
Jatin

On 3/2/2010 8:10 PM, Edwin Zoeller wrote:
> We monitor the port number assigned to the process.
>
> -----Original Message-----
> From: Jim Avery [mailto:jim at jimavery.me.uk]
> Sent: Tuesday, March 02, 2010 7:35 AM
> To: Jatin Davey
> Cc: Nagios Mailinglist
> Subject: Re: [Nagios-users] Monitor Java Process
>
> On 2 March 2010 11:26, Jatin Davey<jashokda at cisco.com>  wrote:
>    
>> Hi
>>
>> I want to know how i can monitor the java process running on remote
>> box , basically i want to keep monitoring it and raise an email alert
>> if it has re-started or stopped functioning. Please let me know how
>> this can be achieved using nagios.
>>
>> Thanks
>> Jatin
>>      
>
> Someone hereabouts recently mentioned you can use jmx4perl
> http://labs.consol.de/lang/de/jmx4perl/
>
> I can't say I've tried it myself yet.
>
>
------------------------------------------------------------------------

If I understand this, you have a java process that you want to monitor.
To see if the process is 'running' your best bet is using check_proc,
however, if you want to see if the process is still functioning and not
hung, you'll need to interact with the process.

As Edwin stated, if your process opens a port, you can connect to it and
check for a default response using check_tcp (or udp).

If you wrote the java process (or have access to the developers) you can
ask that they build in monitoring responses.  I have a java listener
that I added a hook for a specific string.  If I send a specific string
to its UDP port, it returns it's PID and Timestamp.

What does the Java process do?  If it doesn't open a port, does it write
to its log that you can check modification times on? 

If you can interact with the process you can monitor it.  If it just
runs and doesn't interact with others, you can at least monitor that the
process is still running.  In general if you can check its health
manually, you can write something for Nagios to use.

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