Remote monitoring : querying jvm heap

Antoine_BAPST · January 6, 2023, 7:18pm

Hi all,
Happy new year to all of you, I wish you the best for 2023 !

I’m setting up a basic remote probe/monitoring system of our servers, mostly oriented to check communication/performance from Lucee to other hosts/platform (SQL, ElasticSearch, Kafka, File Server …) and of course Lucee’s health.
To do so, each Lucee Server has a template that is queried from our monitoring server.
I would like to add (java heap) memory usage : is there a simple way to query this, basically as it is done in Admin homepage ? (It doesn’t have to be graphic at all; raw data would be perfect).

So if you have a hint, thanks in advance !
A.

Don’t forget to tell us about your stack!

OS: Windows
Lucee Version: 5.3.9.166
Java Version / Tomcat Version: Bundled with 5.3.9.166

pfreitag · January 6, 2023, 7:57pm

Yes, it’s possible to get that info from Java APIs, here’s an example: cfmetrics/memory.cfm at master · foundeo/cfmetrics · GitHub

Zackster · January 8, 2023, 10:53am

remember, Lucee is open source

github.com

lucee/Lucee/blob/6.0/core/src/main/cfml/context/admin/overview.cfm

<!---
Defaults --->

<cfif structKeyExists(form,"adminMode")>
		
	<cfadmin
		action="updateAdminMode"
		type="#request.adminType#"
		password="#session["password"&request.adminType]#"
		mode="#form.adminMode#"
		merge="#!isNull(form.switch) && form.switch=="merge"#"
		keep="#!isNull(form.keep)#">
	<cflocation url="#request.self#?action=#url.action#" addtoken=false>
</cfif>


<cfset current.label = "Lucee " & server.lucee.version & " - " & current.label>
<cfset error.message="">
<cfset error.detail="">
<cfparam name="form.mainAction" default="none">

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andreas · January 8, 2023, 1:30pm

I think lucee has a native function that does that…

Like @Zackster said, the source is there and it seems to happen at:

github.com

lucee/Lucee/blob/4f3956a8b4e77d5e187975469fde50a961421567/core/src/main/cfml/context/admin/chartProcess.cfm

<cfset pool['HEAP']="Heap">
<cfset pool['NON_HEAP']="Non-Heap">

<cffunction name="printMemory" returntype="struct">
	<cfargument name="usage" type="query" required="yes">
	<cfargument name="showTitle" type="boolean" default="true" required="false">
	<cfset var used=evaluate(ValueList(arguments.usage.used,'+'))>
	<cfset var max=evaluate(ValueList(arguments.usage.max,'+'))>
	<cfset var init=evaluate(ValueList(arguments.usage.init,'+'))>
	<cfset var qry=QueryNew(arguments.usage.columnlist)>
	<cfset QueryAddRow(qry)>
    <cfset QuerySetCell(qry,"type",arguments.usage.type)>
    <cfset QuerySetCell(qry,"name",variables.pool[arguments.usage.type])>
    <cfset QuerySetCell(qry,"init",init,qry.recordcount)>
    <cfset QuerySetCell(qry,"max",max,qry.recordcount)>
    <cfset QuerySetCell(qry,"used",used,qry.recordcount)>
    <cfset arguments.usage=qry>
		<cfif arguments.showTitle><b>#pool[usage.type]#</b></cfif>
		<cfset var str = {}>
		<cfloop query="arguments.usage">

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That charProcess.cfm is called by:

github.com

lucee/Lucee/blob/4f3956a8b4e77d5e187975469fde50a961421567/core/src/main/cfml/context/admin/chartAjax.cfm

<cfsilent>
	<cfsetting showdebugoutput="false">
<cfinclude template="chartProcess.cfm">
<cfset struct = sysMetric() />
<cfcontent type="application/json">
</cfsilent><cfoutput>#SerializeJSON(struct)#</cfoutput><cfabort />