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: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
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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