Re: how to get trap massages about cpu usage using ssCpuRawSystem

On 30 January 2012 04:41, Haiel Reder <[email protected]> wrote:
> im trying to get CPU usage in snmpd.conf while using the ssCPURawSystem MIB

What happens if you use 'snmpwalk' on this object?
Can you see the values you expect?

> view all included .iso.org.dod.internet.private.enterprises.ucdavis.systemStats

That shouldn't be necessary.
The "rouser" directive allows access to the full OID tree automatically.



> create user notifier

That doesn't look like a valid Net-SNMP config directive.
Please see the documentation


> rouser notifier

OK - user 'notifier' (once it's been created properly) should be able
to see everything


> trapcommunity public
> informsink 10.10.10.10

That looks OK too.
Are you seeing coldStart and nsShutdown traps when the agent starts and stops?



> monitor -i -u notifier -r 1 -o ssCpuRawSystem.0 -o "cpu usage"
>      .iso.org.dod.internet.private.enterprises.ucdavis.systemStats.cpuRawSystem.0 > 30

cpuRawSystem is a counter object so you need to be looking at the *differences*
between successive values.   Try adding the '-D' option to this line

It's not a percentage either - it's the number of ticks spent in that mode.
The threshold value would depend on the length of time between probes
(and querying every second may put a noticeable load on the system!)

  -o  specifies the OIDs to include in the resulting trap.
The object being monitored will be present anyway, so you don't need to mention
it explicitly.   And "cpu usage" is not a valid OID, so that option won't work.





> im not quite sure that this is how i get the percentage (because ssCpuSystem
> is deprecated) but i hope to get the right diraction

The MIB object ssCpuSystem has been deprecated, because the raw counter
version provides the same information in a more flexible form.   But it's still
present, and you can use that instead if you prefer.   (Note that this is *not*
a counter, so you wouldn't use '-D')

    There was an issue a while back with this reporting something different
depending on what O/S you were using  (which was the other reason for it
being deprecated).   But as long as you're using a reasonably recent
version of the agent, it should be consistent and useable.

Dave

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