mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
42 lines
1.6 KiB
Plaintext
42 lines
1.6 KiB
Plaintext
# $OpenLDAP$
|
|
# Copyright 1999-2000, The OpenLDAP Foundation, All Rights Reserved.
|
|
# COPYING RESTRICTIONS APPLY, see COPYRIGHT.
|
|
H1: Distributing {{I: slapd}} DATA
|
|
|
|
For many sites, running one or more {{I: slapds}} that hold an
|
|
entire subtree of data is sufficient. But sometimes it may be
|
|
desirable to have one slapd refer to other {{I: slapds}} for a
|
|
certain part of the tree. This can be accomplished by
|
|
creating a referral entry in one {{I:slapd}}'s database pointing
|
|
to another {{I: slapd}}. For those familiar with X.500, a {{I:slapd}}
|
|
{{I: referral}} entry is similar to an X.500 knowledge reference.
|
|
|
|
The referral entry acts as a mount point, glueing two slapd
|
|
databases together. A referral entry has an {{I: objectclass}} of
|
|
"referral" and is named by a {{I: ref}} attribute containing a URL
|
|
pointing to the slapd holding the data below the mount
|
|
point. This mechanism is very general and allows slapd
|
|
databases that are not normally hierarchical to be grafted
|
|
together.
|
|
|
|
An example should help illustrate things. Suppose your
|
|
company is running a slapd and just purchased a new
|
|
company, also running a slapd. You can easily connect
|
|
the two databases by creating an entry like this in your
|
|
slapd's database.
|
|
|
|
E: dn: ref="ldap://new.host/o=New Company,c=US", o=Your
|
|
|
|
company, c=US
|
|
|
|
E: objectclass: referral
|
|
|
|
Now any subtree search that has this entry in its scope
|
|
will return a referral to the new company, in addition to any
|
|
entries matched in your database. Referral-aware clients
|
|
will continue the search at the new company's server.
|
|
|
|
A mechanism similar to this is used to support distributed
|
|
indexing, described in Appendix C.
|
|
|