OpenSSI Clusters for Linux

On Mon, Dec 27, 2004 at 06:09:38PM +0530, Mohan Srinivas wrote:
| sh  .1.3.6.1.4.1.2021.58 qmail-queue-size /sbin/qmail-queue-size
|=20
| So snmpwalk  .1.3.6.1.4.1.2021.58 will run the script and get you the
| current queue size(in this case)... There is an exec option in place of t=
he
| "sh" as well.=20
|=20
| I was looking at passing the PID of the process using this option as part=
 of
| my snmpget request but just that I don't know how and googling did not
| help...=20

If I understand the problem correctly, you are facing problems, cos the
commands that can be executed by snmpd doesn't take arguments. You
could, probably, write a script which obtains the PID, and does whatever
you wish to do. Put that, in /sbin or wherever, and call it. Would that
resolve the issue?

Regards,

--=20
Chirag Kantharia, puggy.symonds.net/~chyrag/

Obtaining the PID is trivial :) Lets say the PID obtained from the initial
poll is 66000... Now on the monitored ssi box, all I want to do is cat
/proc/66000/where or simply do a where_pid 66000 and have snmpd return that
as the result of the query. The million dollar question is how do I tell
snmpd (and hence the script) that the pid is 66000? 

I am not using RW communities either so writing a value to the MIB and
having that read by the exec script on the ssi host is ruled out as well. I
could use a keybased ssh login but that does'nt seem too appealing for a
script that going to poll the cluster a dozen times an hour.

Srinivas.
 

-----Original Message-----
From: Chirag Kantharia [mailto:chyrag@...] 
Sent: Monday, December 27, 2004 6:15 PM
To: Mohan Srinivas
Cc: ssic-linux-users@...
Subject: Re: [SSI-users] Doing where_pid via snmpd?


If I understand the problem correctly, you are facing problems, cos the
commands that can be executed by snmpd doesn't take arguments. You could,
probably, write a script which obtains the PID, and does whatever you wish
to do. Put that, in /sbin or wherever, and call it. Would that resolve the
issue?

Regards,

--
Chirag Kantharia, puggy.symonds.net/~chyrag/

First, I'm glad to see you are using Nagios.  Can you share any info on
setting it up? =20
I'm no expert on nagios or snmpd but I'll try to help..    One thing
that might be helpful is "localview".
If you start each nagios instance (or snmpd instance) with localview, it
will only see processes running on the local node.
=20
Also, as has been pointed out, you can run where_pid or just look in
/proc/<pid>/where to see where a process is running.
=20
As far as i know, there are no modified MIBs for OpenSSI.
=20
bruce
=20

	-----Original Message-----
	From: ssic-linux-users-admin@...
[mailto:ssic-linux-users-admin@...] On Behalf Of Mohan
Srinivas
	Sent: Monday, December 27, 2004 4:24 AM
	To: ssic-linux-users@...
	Subject: [SSI-users] Doing where_pid via snmpd?
=09
=09

	Hi,=20

	I am monitoring certain processes on my cluster using nagios and
a homemade perl script... I would also like to include info on which
node the process is on.

	For example if /sbin/keepalive is on node 1 then I want nagios
to be able to get that info from the poll.=20

	I can get the PID of the process from this OID...=20

	[root@... root]# grep 65801 one.txt=20
	HOST-RESOURCES-MIB::hrSWRunPath.65801 =3D STRING:
"/sbin/keepalive"=20

	Is there any way I can use the PID obtained to get the node
number it is actually residing on? My nagios script looks for
/sbin/keepalive but since the process table I view via snmpd is common
across all nodes, my script shows keepalive running on all nodes while
its only on one node! This turns out to be very misleading when
monitoring programs that may be running on only one node at any given
time.

	I considered using the snmpd.conf "exec" option but I cannot
figure out how to pass it an argument (the PID) at time of making the
snmp request from my nagios box.

	Have you a modified MIB which would also list the node a process
is on? Something like HOST-RESOURCES-MIB::hrThisPidOn.65801 =3D 1 if pid
65801 were on node 1.

	Srinivasan Mohan
	Capco
	T:  +91-80-51997258(pstn) / 67247 (VoIP - capco internal)
	M: +91-98860-23699
	 <www.capco.com <file:///\\www.capco.com> >=20