[Xymon] DNS

[Jeremy Laidman]

On 12 February 2015 at 06:23, Eli via Xymon <xymon at xymon.com> wrote:

> Is there anyone monitoring DNS performance with xymon? Is there plugins or
> script if anyone can share idea that will be great. DNS is ruining on Linux
> server.


DNS performance is already measured in Xymon via the DNS probe.  You should
see graphs of DNS response times.  If you want more detail than this, you
need to do a bit more work.

As Robert said, you need to define what you want to see.  Even better is to
specify the problem you're trying to solve, and then you're more likely to
get responses that can help solve that problem.  Are you wanting to monitor
resolves or authoritative servers?

I have a lot of DNS monitoring, but most of it is looking for specific
metrics that relate to faults we have experienced, and they aren't
generally useful for most installations.

There are two ways I can think of to monitor DNS server performance.  One
is to extract metrics from the DNS server, typically by running "rndc
stats" every 5 minutes or so, as per Richard's example.  The other is to
perform probes from another server (eg from Xymon) and look for performance
or functionality shortcomings.  I have a script that sends 100 lookups
(using "dig") as rapidly as it can, and collects data about what it finds.
It keeps counters of the number of no-error responses received, how fast it
was able to send 100 queries.  I then feed this into Xymon via data
messages.

Unfortunately, due to intellectual property constraints, I can't share my
scripts with you but I can offer advice to help you write and integrate
your own scripts.
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