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       slapd.overlays - overlays for slapd, the stand-alone LDAP daemon


       The slapd(8) daemon can use a variety of different overlays to alter or
       extend the normal behavior of a  database  backend.   Overlays  may  be
       compiled statically into slapd, or when module support is enabled, they
       may be dynamically loaded. Most of the overlays are only allowed to  be
       configured  on  individual  databases,  but some may also be configured

       Configuration options for each overlay are documented separately in the
       corresponding slapo-<overlay>(5) manual pages.

              Access  Logging.   This  overlay  can record accesses to a given
              backend database on another database.

              Audit Logging.  This overlay records changes on a given  backend
              database to an LDIF log file.  By default it is not built.

       chain  Chaining.  This overlay allows automatic referral chasing when a
              referral would have been returned, either when configured by the
              server or when requested by the client.

              Constraint.    This   overlay   enforces  a  regular  expression
              constraint on all values of specified attributes. It is used  to
              enforce  a  more  rigorous  syntax when the underlying attribute
              syntax is too general.

       dds    Dynamic  Directory  Services.   This  overlay  supports  dynamic
              objects,  which  have a limited life after which they expire and
              are automatically deleted.

              Dynamic Group.  This is a demo overlay which extends the Compare
              operation  to  detect  members  of  a  dynamic group.  It has no
              effect on any other operations.

              Dynamic List.  This overlay allows expansion of  dynamic  groups
              and more.

       pcache Proxycache.  This overlay allows caching of LDAP search requests
              in  a  local  database.   It  is  most  often  used   with   the
              slapd-ldap(5) or slapd-meta(5) backends.

              Password  Policy.   This  overlay provides a variety of password
              control mechanisms, e.g.  password  aging,  password  reuse  and
              duplication control, mandatory password resets, etc.

       refint Referential  Integrity.  This overlay can be used with a backend
              database such as slapd-bdb(5) to maintain the cohesiveness of  a
              schema which utilizes reference attributes.

              Return  Code.   This  overlay  is useful to test the behavior of
              clients when server-generated erroneous and/or unusual responses

       rwm    Rewrite/remap.  This overlay is experimental.  It performs basic
              DN/data rewrite and objectClass/attributeType mapping.

              Syncrepl Provider.  This overlay  implements  the  provider-side
              support  for  syncrepl  replication, including persistent search

              Translucent Proxy.  This overlay can  be  used  with  a  backend
              database  such  as slapd-bdb(5) to create a "translucent proxy".
              Content of entries retrieved from a remote LDAP  server  can  be
              partially overridden by the database.

       unique Attribute  Uniqueness.   This overlay can be used with a backend
              database such as slapd-bdb(5) to enforce the uniqueness of  some
              or all attributes within a subtree.

              Value  Sorting.   This overlay can be used to enforce a specific
              order for the values of an attribute when it is  returned  in  a


              default slapd configuration file

              default slapd configuration directory


       ldap(3),    slapo-accesslog(5),    slapo-auditlog(5),   slapo-chain(5),
       slapo-constraint(5), slapo-dds(5), slapo-dyngroup(5), slapo-dynlist(5),
       slapo-pcache(5),  slapo-ppolicy(5),  slapo-refint(5), slapo-retcode(5),
       slapo-rwm(5), slapo-syncprov(5), slapo-translucent(5), slapo-unique(5).
       slapo-valsort(5).   slapd-config(5),  slapd.conf(5), slapd.backends(5),
       slapd(8).           "OpenLDAP          Administrator's           Guide"


       OpenLDAP  Software  is developed and maintained by The OpenLDAP Project
       <>.   OpenLDAP   Software   is   derived   from
       University of Michigan LDAP 3.3 Release.