Re: one slapd to multiple backends LDAP

[Pierangelo Masarati <masarati@aero.polimi.it>]

> At 14:21 07/12/01 +0100, Pierangelo Masarati a écrit:
> 
> >You need to configure the proxies to point at the least common naming 
> >context to spawn searches across the whole tree. This because the 
> >appropriate database is selected based on the base of the request,
> >so if you have
> >
> ># database 1
> >suffix  "ou=pers,dc=univ-nancy2,dc=fr"
> >
> ># database 2
> >suffix  "ou=etudiants,dc=univ-nancy2,dc=fr"
> >
> >and you issue a search request with base "dc=univ-nancy2,dc=fr", 
> >none of the databases will be selected.
> 
> Thank's for the answer
> 
> I have just done the following attempt:
> 
>                           dc=univ-nancy2,dc=fr
>           _________________|______________________________
>           |                                                                                  |
> dc=univ-nancy2,dc=fr                                            dc=univ-nancy2,dc=fr
>           |                                                                                  |
>     ou=pers                                                                       ou=etudiants
> 
> and my config is :
> 
> database        ldap
> uri             ldap://neith.univ-nancy2.fr:395  # ou=pers,....
> suffix          "dc=univ-nancy2,dc=fr"
> 
> 
> database        ldap
> uri             ldap://etumel.univ-nancy2.fr:392  # ou=etudiants,...
> suffix          "dc=univ-nancy2,dc=fr"
> 
> If I search :
> (uid=vmathieu) with the base dc=univ-nancy2.fr or ou=pers,dc=univ-nancy2,dc=fr, it works
> 
> If I search :
> (uid=vmath999) with the base dc=univ-nancy2.fr or ou=etudiants,dc=univ-nancy2,dc=fr, it doesn' works
> 
> vmathieu : uid=vmathieu,ou=People,ou=Pers,dc=univ-nancy2,dc=fr (in the first ldap database)
> vmath999: uid=vmath999,ou=MI,ou=PLG,ou=ETUDIANTS,dc=univ-nancy2,dc=fr (in the second database)
> 
> It's as if only the first ldap database was treated

That's exactly what happens, because you did:

# database 1
suffix		"dc=univ-nancy2,dc=fr"

# database 2
suffix		"dc=univ-nancy2,dc=fr"

so your searches with base either "ou=pers,dc=univ-nancy2,dc=fr" or
"ou=etudiants,dc=univ-nancy2,dc=fr" are captured by the first
database, as "dc=univ-nancy2,dc=fr" is suffix for both bases.

> 
> 
> >You should try the (experimental) back-meta; it does exactly what 
> >you expect.
> 
> I am going to look 

In this case, you will instruct one database, serving suffix
"dc=univ-nancy2,dc=fr" to look to different servers serving
the two subtrees, giving it a hint: if the search has base

"ou=pers,dc=univ-nancy2,dc=fr"

it will be forwarded to the appropriate server (the same will
apply to the other base).  The striking difference is that a
search with base "dc=univ-nancy2,dc=fr" will be spawned to
both servers, and the results from both will be merged and
returned as one big result.

Let me know.