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Shawn,

On 3/29/18 12:00 PM, Christopher Schultz wrote:
> Shawn,
> 
> On 3/28/18 4:42 PM, Shawn Heisey wrote:
>> On 3/28/2018 1:18 PM, Christopher Schultz wrote:
>>>> I would like to write a logging thread that can get ALL of
>>>> the datasource objects from the context, and for types that
>>>> it knows, cast them to the appropriate object to log the 
>>>> active/idle connection counts.
>>> 
>>> It might be easier to do this via JMX.
> 
>> Perhaps.  But then I have to figure out how to get the program 
>> started with the sysprops that enable remote JMX.  The system
>> has no GUI, and we don't have any X-Windows infrastructure, so
>> running JDK tools locally on the Linux server is challenging.
>> Not impossible, just requires me to set up things that I don't
>> already have, to do X forwarding over SSH. With the logging
>> thread idea, we just need to update code, recompile, and
>> redeploy.
> 
> I don't bother with any of that garbage. I use Tomcat's Manager 
> application and the JMXProxyServlet. It's an HTTP-to-JMX bridge,
> so your client just has to speak HTTP.
> 
> I use it along with a Nagios plug-in to fetch things like (wait
> for it) DataSource pool stats :)

Have a look at:
http://people.apache.org/~schultz/ApacheCon%20NA%202016/Monitoring%20Apa
che%20Tomcat%20with%20JMX.pdf

- -chris
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