5.x, LDAP and caching uid/gid data

Ben Hockenhull benh at jpj.net
Wed Jun 8 19:37:38 GMT 2005

At 1:24 PM -0500 6/8/05, Tony Shadwick wrote:

>On Wed, 8 Jun 2005, Ben Hockenhull wrote:
>> We're in the midst of implementing a couple of FreeBSD servers, each
>> containing about 5k users, with authentication against LDAP.  We're using
>> PADL's nss_ldap and pam_ldap modules, and while things work well, I'm
>> looking for ways to improve performance and reduce active queries against
>> LDAP.
>> There's no user information on the local system at all, so every operation
>> that requires UID/GID information had to do an LDAP lookup to get UID/GID
>> data.  So, for example, every piece of mail delivered means an LDAP lookup.
>> Ick.
>> Is there such a thing as nscd for FreeBSD, and if so, has anyone had
>> experience using it?  I found a lookupd utility that looks promising, but
>> I'm leery of implementing it in production as it seems like fairly untested
>> software.
>> Failing nscd or a similar thing, are there other ways I can cache this
>> infomration or otherwise improve performance?
>Just based on my past experiences with NIS (working on learning LDAP as
>we speak), one would normally have SOME local user data.
>For example, a local sendmail user, a local root user, if you're running a
>MySQL daemon locally, you'd have a local mysql user.
>I think?  Someone could correct me if I'm wrong here, but I see little
>benefit from having the smmsp user being in ldap and not local to the
>machine.  Feel free to prove me wrong on this though. :)
>I'd still be interested in hearing about ldap caching, as it relates to me
>earlier question about laptop users and centralized auth.

I should have been a bit more explicit.  All system accounts (root, smmsp,
etc) are still local to the server, but any actual user accounts are in
LDAP, with no local passwd entries at all.


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