[Xymon] what IS the "DNS" check in xymon?

[Christoph Zechner]

Follow-up, because I just realised this question has already been asked 
on this mailing list:

https://lists.xymon.com/archive/2019-March/046162.html

Cheers
Christoph


On 15/02/2022 10:12, Christoph Zechner wrote:
> On 15/02/2022 09:38, Ian Diddams wrote:
>> if we set a hosts.cfg line
>>
>> 10.24.38.132    walkie # ssh dns
>>
>> we can expect xymon to check that ssh connections exist for thats 
>> erver, and also does some sort of dns check.
>>
>> what exactly IS this check?
> 
> Quote from the man page of hosts.cfg (Debian 11):
> 
> "DNS SERVER TESTS
>         These tags are used to setup monitoring of DNS servers.
> 
>         dns    Simple DNS test. It will attempt to lookup the A record 
> for the hostname of the DNS server.
> 
>         dig    This is an alias for the "dns" test. In xymonnet, the 
> "dns" and "dig" tests are handled identically, so all of the facilities 
> for testing described for the "dns" test are also available for the 
> "dig" test.
> 
>         dns=hostname
> 
>         dns=TYPE:lookup[,TYPE:lookup...]
>                The default DNS tests will attempt a DNS lookup of the 
> DNS' servers own hostname. You can specify the hostname to lookup on a 
> DNS server by listing it on each test.
> 
>                The second form of the test allows you to perform 
> multiple queries of the DNS server, requesting different types of DNS 
> records. The TYPE defines the type of DNS data: A (IP-address), MX (Mail 
> eXchanger),  PTR  (re‐
>                verse),  CNAME  (alias),  SOA  (Start-Of-Authority),  NS 
> (Name  Server)  are  among  the  more  common  ones  used.  The "lookup" 
> is the query. E.g. to lookup the MX records for the "foo.com" domain, 
> you would use
>                "dns=mx:foo.com". Or to lookup the nameservers for the 
> "bar.org" domain, "dns=ns:bar.org".  You can list multiple lookups, 
> separated by commas. For the test to end up with a green status, all 
> lookups must succeed."
> 
> Cheers
> Christoph
> 
> 
>>
>> becasue the dns on that server is runjning fine - but the xymon alert 
>> shopws red.
>>
>>
>>
>> Service dns on walkie is not OK : Service unavailable
>>
>>
>> Name not found
>>
>> Seconds: 0.007559000
>>
>>
>>
>>
>> any ideas please/  Ive googled and come up with nothing (though my 
>> googling skills are not the greatest)
>>
>>
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