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Dashboard and Web Server - How do I monitor a Webserver using the JMX-Server Plugin?

  1. Modify the Webserver start script.

Webserver start script 

JMX\_PORT=50505 # these two lines enable remote monitoring/profiling of the application

JMX\_FLAGS="-Dcom.sun.management.jmxremote.port=$JMX\_PORT -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"

From the preceding steps, uncommenting those variables will allow the Webserver to run with the JMX flags. Once a Java application is run with JMX flags, JMX managers/clients such as JConsole and our JMX-Server plugin will now be able to monitor the MBean attributes (such as Memory) of the Java application.

  1. Save the start script.
  2. Start the Webserver.
  3. Configure the JMX-Server Sampler.
<sampler name="centos_jmx_server_webserver">
    <sampleInterval>
        <data>1</data>
    </sampleInterval>
    <plugin>
        <jmx-server>
            <connectionSettings>
                <generic>
                    <connectionSetting>
                        <name>serviceURL</name>
                        <value>
                            <var ref="WebServerJMX"></var>
                        </value>
                    </connectionSetting>
                </generic>
            </connectionSettings>
            <aliases>
                <alias>
                    <name>$1</name>
                    <value>
                        <data>java.lang:type=Memory,*</data>
                    </value>
                    <showCommands>
                        <headlines>false</headlines>
                        <tableColumns>false</tableColumns>
                    </showCommands>
                </alias>
            </aliases>
            <columns>
                <column>
                    <label>attribute</label>
                    <rowTemplate>
                        <data>HeapMemoryUsage</data>
                    </rowTemplate>
                </column>
                <column>
                    <label>committed</label>
                    <rowTemplate>
                        <data>$1.HeapMemoryUsage.committed</data>
                    </rowTemplate>
                </column>
                <column>
                    <label>init</label>
                    <rowTemplate>
                        <data>$1.HeapMemoryUsage.init</data>
                    </rowTemplate>
                </column>
                <column>
                    <label>max</label>
                    <rowTemplate>
                        <data>$1.HeapMemoryUsage.max</data>
                    </rowTemplate>
                </column>
                <column>
                    <label>used</label>
                    <rowTemplate>
                        <data>$1.HeapMemoryUsage.used</data>
                    </rowTemplate>
                </column>
            </columns>
            <jproperties>
                <jproperty>
                    <data>-Xint</data>
                </jproperty>
            </jproperties>
            <idAttributes></idAttributes>
        </jmx-server>
    </plugin>
</sampler>
  1. Save the Gateway setup.

The resulting Dataview will look something like this:

JMX-Server Webserver dataview

This guide assumes that the Netprobe has been set up to run the JMX-Server plugin. For more information, see JMX plugin documentation.

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