* Finn-Arne Johansen
> Do you have a short commandline for me ?
perl -MNet::Domain -e 'print Net::Domain::hostfqdn(),"\n"'
On my workstation this returns the same string as "hostname --fqdn".
However, a very interesting fact seems to be that the perl invocation
queries a nameserver, while "hostname --fqdn" does not.
As I have the fully-qualified hostname correctly specified in
/etc/hosts, there should be no need for the perl module to look in
DNS, as I have "files" specified before "dns" in /etc/nsswitch.conf:
hosts: files dns
Another strange thing is that the perl module looks up all kinds of
whacky names - here's the mind-boggling tethereal dump:
0.000000 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.no.fud.no
0.000530 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
0.002536 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.no.fud.no.fud.no
0.002820 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
0.003778 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.no.fud.no.linpro.no
0.004048 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
0.005757 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.fud.no
0.006024 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
0.007021 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.fud.no.fud.no
0.007286 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
0.008242 213.145.167.26 -> 213.145.167.25 DNS Standard query A
pride.fud.fud.no.linpro.no
0.008568 213.145.167.25 -> 213.145.167.26 DNS Standard query response, No
such name
My /etc/resolv.conf contains the following:
search fud.no linpro.no
nameserver 213.145.167.25
nameserver 217.13.4.24
nameserver 217.13.7.140
The hostname of the machine is "pride.fud.no", and /etc/hosts contain
the following line:
127.0.0.1 pride.fud.no pride localhost
...all in all, I cannot see why Net::Domain would want to look up in
DNS, as all the information it needs are available without it. And
why on earth it would try all those crazy names I have no idea.
However, if the DNS server at this point is misconfigured so that it
ends up waiting for some timeout while trying to resolve the crazy
names it is only to be expected that the munin-node postinst takes
ages - the Net::Domain::hostfqdn() function gets called once per
plugin.
I am now fairly confident that this is a bug / misdesign of
Net::Domain and that it should therefore be reassigned to
perl-modules. I'll await your feedback before doing so, though.
--
Tore Anderson
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