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 globally.
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.
- 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 entry.
- 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.
- Dynamic Directory Services. This overlay supports dynamic objects, which
have a limited life after which they expire and are automatically
- 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
- Dynamic List. This overlay allows expansion of dynamic groups and
- MemberOf. This overlay maintains automatic reverse group membership
values, typically stored in an attribute called memberOf.
- Proxybind. This overlay forwards simple bind requests on a local database
to a remote LDAP server.
- Proxycache. This overlay allows caching of LDAP search requests in a local
database. It is most often used with the slapd-ldap(5) or
- Password Policy. This overlay provides a variety of password control
mechanisms, e.g. password aging, password reuse and duplication control,
mandatory password resets, etc.
- 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 occur.
- Rewrite/remap. This overlay is experimental. It performs basic DN/data
rewrite and objectClass/attributeType mapping.
- 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.
- 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 search.
- 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
<http://www.openldap.org/>. OpenLDAP Software is derived from the
University of Michigan LDAP 3.3 Release.