[Xymon] CLOCK and CPU test

[Novosielski, Ryan]

Mine always work very well, so at least in my environment, this isn't a concern. It is rare to see anything but 0s.


From: Ralph Mitchell [mailto:ralphmitchell at gmail.com]
Sent: Wednesday, September 25, 2013 06:05 PM
To: Novosielski, Ryan
Cc: Japheth Cleaver <cleaver at terabithia.org>; xymon at xymon.com <xymon at xymon.com>
Subject: Re: [Xymon] CLOCK and CPU test


Just FYI, the clock drift is measured by comparing the date/time sent at the bottom of the client message against the Xymon server clock.  I have some systems on slow network connections and sometimes it takes a couple of retries for the status report to get through, and by then the client time is often 10 - 30 seconds adrift.

In other words, it's not simply the client working out that its own clock is slow.

Ralph Mitchell

On Sep 25, 2013 4:22 PM, "Novosielski, Ryan" <novosirj at ca.rutgers.edu<mailto:novosirj at ca.rutgers.edu>> wrote:
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On 09/25/2013 04:16 PM, Japheth Cleaver wrote:
> On Wed, September 25, 2013 12:35 pm, Novosielski, Ryan wrote:
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>>
>> Hi all,
>>
>> I suspect I know the answer to this but want to check:
>>
>> I'm running Xymon 4.3.12. My manager has recently brought up the
>> need to have the clock drift monitored (it caused problems with
>> a DB server when there was massive drift once for some reason).
>> I looked into how to do this and it looks like the highest level
>> that clock drift can cause Xymon to alert at is yellow. This
>> means that if I wanted to be alerted, I'd have to also get
>> alerted for yellow CPU on that machine, right? So far my only
>> idea is to raise the yellow level for CPU. I don't really want
>> to bother with an external test.
>>
>> Any tips?
>>
>
>
> According to
> http://www.xymon.com/xymon/help/manpages/man5/analysis.cfg.5.html
> you should be able to add a line like
>
> CLOCK 15 red
>
> ... to an analysis.cfg file (or *.d/ entry) to have it go red if
> the clock delta exceeds that absolute value. I have to admit not
> having tested that ever though.
>
> If that doesn't work, you might be able to simulate it (or assign
> the color to a different test entirely) with a DS entry; something
> like:
>
> DS cpu clock.rrd:la <-15 COLOR=red "TEXT=System clock is &V
> seconds off" DS cpu clock.rrd:la >15 COLOR=red "TEXT=System clock
> is &V seconds off"

Wonderful! I must have been reading an old copy of that documentation
(Google'd for it instead of using what was on the system). Thanks Japheth!

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