Re: nscd for freebsd

On Monday 13 November 2006 14:58, Dmitriy Kirhlarov wrote:
> I'm interested in name service caching daemon for freebsd (it's useful
> for external userbase, stored in ldap and for monitoring hosts, with
> resolving/polling of many hosts). It's much more useful, then local
> cached named and local ldap replica.
>
> I found "cached" daemon in HEAD.
>
> Can somebody answer me -- when this daemon will be MFC-ed to RELENG_6?
> Also why this strange name?
> It's impossible to find this name in google, cause this daemon used to
> be called nscd.
> Is there any reason for inventing new name?
>
Actually, cached is called "cached" because initially it was intended only to 
cache the already obtained results of nsswitch queries. This is not how nscd 
behaves. Nscd makes all queries (to LDAP, NIS, etc) by itself and caches the 
results. cached only cached the results of requests, that have been actually 
made by other applications. The name "cached" was used to highlight this 
difference.

Later, however, the nscd-like functionality was added to cached, but the name 
was left unchanged. Personally I don't see any reasons why "cached" can't be 
renamed to nscd right now - so I guess, it would happen in the nearest 
future.

cached is similar to nscd in many ways (including configuration file). To 
enable nscd-like behavior for particular nsswitch database (so that cached 
will make all queries by itself), "perform-actual-lookups" directive should 
be specified in cached.conf. Please see cached(8) manual page for more 
details about this. The choice of using or not using "perform-actual-lookups" 
mode depends on many factors and should be made by system administrator. The 
default value for this option is "no".

Can't say anything about when cached would be MFC'ed. All I can say is that 
it's possible. It will require a number of changes in libc, but they all are 
fine-grained and, as far as I remember, the patch, that I've used to add 
caching support to -CURRENT was almost clearly applicable to RELENG_6.

-- 
With best regards,
Michael Bushkov
Rostov State University

-- 
With best regards,
Michael Bushkov
Rostov State University