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@voice-system.ro> wrote:

On 12/15/06 21:27, Jiri Kuthan wrote:
> 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.
>>
>
> Actually we have tried this one and yet another one (whose name I can't recall)
> 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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