RE: [opennms-discuss] Manually restarting Pollerd

[Phelan-1, B. <Bri...@ks...>]

Jesse,

See this message posted previously by Tarus.

Brian

-----Original Message-----
From: Jesse Mather [mailto:JM...@co...]
Sent: Tuesday, May 06, 2003 2:00 PM
To: di...@li...
Subject: [opennms-discuss] Manually restarting Pollerd


I have set up a couple of packages in poller-configuration.xml.  I would like to be able to restart just the Pollerd service when I move an interface from one package to another.  I have tried to use the opennms.sh stop <service id> command, but I'm not sure what "service id" refers to.

-----Original Message-----
From: Tarus Balog [mailto:ta...@so...]
Sent: Wednesday, December 18, 2002 11:00 AM
To: di...@op...
Subject: [opennms-discuss] Starting and Stopping OpenNMS Processes
Individually


Gang:

One of my clients (and like all of them, he is brilliant, friendly and
attractive) has been experimenting with using JMX classes to start and
stop OpenNMS processes.

Note: The instructions included in this post are in no way supported or
recommended. In fact, you should probably stop reading this right now and
go and do something that won't break your OpenNMS system.

For background, see:

http://mx4j.sourceforge.net/docs/bk01ch03.html

and focus on the HTTP Adaptor.

Okay, I don't pretend to understand all of this yet, but the Manager class
in OpenNMS, which is responsible for starting and stopping the OpenNMS
processes, starts a "Managed Bean" server running on port 8181. The MBean
server is then able to receive commands via HTTP on that port.

As a demonstration, on your OpenNMS server bring up a browser and run:

http://localhost:8181/server

While nothing (probably) will be displayed in your browser, if you view
the source you will see something like:

<?xml version="1.0" encoding="UTF-8"?>
<Server><MBean name="OpenNMS:Name=Collectd"></MBean><MBean
name="OpenNMS:Name=Capsd"></MBean><MBean
name="OpenNMS:Name=Actiond"></MBean><MBean
name=":Name=HttpAdaptor"></MBean><MBean
name=":Name=XSLTProcessor"></MBean><MBean
name="OpenNMS:Name=Pollerd"></MBean><MBean
name=":Name=HttpAdaptorMgmt"></MBean><MBean
name="JMImplementation:type=MBeanServerDelegate"></MBean><MBean
name="OpenNMS:Name=Trapd"></MBean><MBean
name="OpenNMS:Name=Outaged"></MBean><MBean
name="OpenNMS:Name=Notifd"></MBean><MBean
name="OpenNMS:Name=Eventd"></MBean><MBean
name="OpenNMS:Name=Threshd"></MBean><MBean
name="OpenNMS:Name=Dhcpd"></MBean><MBean
name="OpenNMS:Name=Rtcd"></MBean><MBean
name="OpenNMS:Name=Discovery"></MBean><MBean
name="OpenNMS:Name=FastExit"></MBean></Server>

Each if the values in "name" represents a service that can be controlled
by the MBean server.

So, how do you use this to start and stop a service in OpenNMS? It is
pretty simple:

http://localhost:8181/invoke?objectname=OpenNMS%3AName=Collectd&operation=stop

This URL will stop the service named "OpenNMS:Name=Collectd". View the
source in order to see if the action was successful:

<?xml version="1.0" encoding="UTF-8"?>
<MBeanOperation><Operation objectname="OpenNMS:Name=Capsd"
operation="invoke" result="success"
return=""></Operation></MBeanOperation>

Now, in order to restart Collectd, you have to do two steps:

http://localhost:8181/invoke?objectname=OpenNMS%3AName=Collectd&operation=init

and again check the source:

<?xml version="1.0" encoding="UTF-8"?>
<MBeanOperation><Operation objectname="OpenNMS:Name=Collectd"
operation="invoke" result="success"
return=""></Operation></MBeanOperation>

And finally start the process:

http://localhost:8181/invoke?objectname=OpenNMS%3AName=Collectd&operation=start

and check the source:
<?xml version="1.0" encoding="UTF-8"?>
<MBeanOperation><Operation objectname="OpenNMS:Name=Collectd"
operation="invoke" result="success"
return=""></Operation></MBeanOperation>

Okay, now that the gun is in your hand, have fun but don't shoot yourself.
I would be careful about stopping something like Eventd, since I have no
idea what will happen if Eventd was stopped and something like the Poller
tried to send an event.

We will continue to play with this, and I hope we can add an admin page to
do this for things like capsd, collectd and the poller. It will probably
require some more code (such as a "pause" method) to restart something
like Eventd.

Have fun.

-T



-- 
Tarus Balog
Consultant
Sortova Consulting Group, http://www.sortova.com
+1-919-696-7625
ta...@so...



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