[smokeping-users] another SmokePing DNS probe

[Tobias Oetiker]

For those interested in DNS.pm, here is another entry :-)
cheers
tobi


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---------- Forwarded message ----------
From: Carl Elkins <carl.elkins at pace.co.uk>
To: André Stolze <stolze at uni-muenster.de>
Cc: oetiker at ee.ethz.ch
Date: Thu, 10 Jul 2003 19:14:33 +0100
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Subject: Re: SmokePing DNS probe

André Stolze wrote:
> Hi,

[snip]

>>multiple DNS servers - it would only ever query one of the
>>configured set, seemingly chosen at random.
>
>
> This looks mysterious to me. As I think the probe schould use
> always the first of the entries.

>From the code, I'd agree, but I'll bet it's down to the values being
stored in a hash, and then order actually becomes indeterminate (well,
complex, and not guaranteed)...

>
>
>>I've made modifications, based on the forking behaviour of
>>the EchoPing probe, and now have a probe which consistently
>>works as expected.  Would you be interested in this version,
>>or would you prefer that I contact Tobias directly?
>>
>
> I think both would be great. My brobe was in the beginning only
> A kind of hack to check if an DNS-Server is up.

Understood - usually the way these things start out ;-)  I'm very
grateful for you supplying it in the first place, thus giving me the
opportunity to build on it, and to Tobi for the collection of useful
tools (cc'd on this).

> So I'm very
> Interested in something like a prfessional Versin ;-)

I'd hardly go that far ;-)
However, it has been polling 4 servers for nearly 24 hours, now, with
very little problem (there is an occasional perl exception caught &
logged, but it doesn't seem to cause any serious side-effects - I guess
it's down to the asynchronous calls to dig, but I'll look into that later).

>
> Regards
> André
[snip]
>
>

My DNS.pm is attached, to do with as you see fit.




Regards,

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