[Xymon] CLOCK and CPU test

[Ralph Mitchell]

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>
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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