[Xymon] Xymon server post-migration blues pt. 1 - "brown-outs"

[John Horne]

On Tue, 2019-04-23 at 21:50 -0700, Greg Earle wrote:
>
> At my work we were forced to migrate our data center to a new facility,
> so we bought a new monitoring PC to replace a RHEL 6.10 system that ran
> Xymon 4.3.12.  The new monitoring PC runs RHEL 7.6 and Xymon 4.3.28
> (using the Terabithia RPMs).
>
Yup, done the same recently (same versions). We had very few problems though.

>
> When they fail, the alert message is always
>
> --
> Service <service> on <host> is not OK : Service listening but
> unavailable (connect timeout)
> --
>

> --
> Address=192.168.1.26:22, open=1, res=0, err=1, connecttime=0.004546,
> totaltime=11.653128,
>
We saw something similar when we had 4 clients that the Xymon server could not
connect to. As such the overall Xymonnet process time went past its timeout. I
think the timeout is 30 seconds (see the xymonnet man page). I also think that
xymonnet then ignores any further tests that it would normally do (hence
causing other red alerts). If you look on the Xymon server display at the
'xymonnet' column, it should show you the time it took to do various tests and
the overall time taken.

As in our case, I would suggest looking at the clients though. Check the logs
to see if the new Xymon server is allowed to connect to it. Is something
blocking it - local (client) firewall, blocked by IP address etc? (It was this
in our case.)



John.

--
John Horne | Senior Operations Analyst | Technology and Information Services
University of Plymouth | Drake Circus | Plymouth | Devon | PL4 8AA | UK
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