SLAPD.OVERLAYS(5)             File Formats Manual            SLAPD.OVERLAYS(5)

       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.

              Collective Attributes.  This overlay implements RFC 3671
              collective attributes; these attributes share common values over
              all the members of the collection as inherited from an ancestor

              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.

              MemberOf.  This overlay maintains automatic reverse group
              membership values, typically stored in an attribute called

       pbind  Proxybind.  This overlay forwards simple bind requests on a
              local database to a remote LDAP server.

       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.

       sssvlv Server Side Sorting and Virtual List Views.  This overlay
              implements the RFC2891 server-side sorting control and virtual
              list view controls, and replaces the RFC2696 paged-results
              implementation to ensure it works with the sorting technique.

              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-collect(5), slapo-constraint(5), slapo-dds(5), slapo-dyngroup(5),
       slapo-dynlist(5), slapo-memberof(5), slapo-pbind(5), slapo-pcache(5),
       slapo-ppolicy(5), slapo-refint(5), slapo-retcode(5), slapo-rwm(5),
       slapo-sssvlv(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.

OpenLDAP 2.4.40                   2014/09/20                 SLAPD.OVERLAYS(5)