20 Dec
2006
20 Dec
'06
12:23 p.m.
Just out of interest, is DNS caching required or recommended on the servers
themselves?
I checked and *nscd* is present in the current installed version of CentOS
on all the servers without the need for downloads or updates (at least from
the packages I selected before installing). It just hasn't been configured
and as far as I can tell, is not running.
Also, what sort of performance should I expect from these servers given the
specs I mentioned before, in terms CPS, for example. Not necessarily looking
for a definitive figure, but at least a ball-park figure - say a bare
minimum (50 CPS min. or above maybe?).
On 12/19/06, Daniel-Constantin Mierla <daniel(a)voice-system.ro> wrote:
On 12/15/06 21:27, Jiri Kuthan wrote:
Actually we have tried this one and yet another one (whose name I can't
recall)
At 10:37 15/12/2006, Daniel-Constantin Mierla
wrote:
> On 12/14/06 17:03, samuel wrote:
>
>> It might be due to a DNS query....whenver a request has to be
>> forwarded to a domain, openSER makes a DNS query to resolv the IP.
>> During this operation, the child processing the request will not
>> answer to further incoming messages.
>>
> If proves to be because of DNS, the best is to install nscd (name
service
cache daemon) which will speed-up a lot DNS interaction. Having it
in the system will help other applications to do DNS queries faster (e.g.,
asterisk, mail servers ...). It looks to be really powerful being able to
cache many services, not only DNS. It comes packaged with most of common
distributions.
and there were some reliability issues.
Unfortunately, I remember this
very remotely,
cc-ed thus serusers as this debate was there once
going on -- hopefuly
someone
with better memory than myself will speak up.
nscd is part of GNU C Library, I am sure a lot of people will be happy
to learn about and many will strive to fix as soon as possible, if you
can describe the issues you had with it -- it is part of a core
component in all Unixes.
Also, the name of the other one and the issues will help the developers
to make it better -- testing and feedback is the most appreciated.
Cheers,
Daniel
-jiri
--
Jiri Kuthan http://iptel.org/~jiri/
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