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SLAPD.OVERLAYS(5) File Formats Manual SLAPD.OVERLAYS(5)
NAME
slapd.overlays - overlays for slapd, the stand-alone LDAP daemon
DESCRIPTION
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 glob‐
ally.
Configuration options for each overlay are documented separately in the corresponding
slapo-<overlay>(5) manual pages.
accesslog
Access Logging. This overlay can record accesses to a given backend database on
another database.
auditlog
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.
collect
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
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 under‐
lying 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.
dyngroup
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.
dynlist
Dynamic List. This overlay allows expansion of dynamic groups and more.
memberof
MemberOf. This overlay maintains automatic reverse group membership values, typi‐
cally stored in an attribute called memberOf.
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 data‐
base. It is most often used with the slapd-ldap(5) or slapd-meta(5) backends.
ppolicy
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.
retcode
Return Code. This overlay is useful to test the behavior of clients when server-
generated erroneous and/or unusual responses occur.
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.
syncprov
Syncrepl Provider. This overlay implements the provider-side support for syncrepl
replication, including persistent search functionality.
translucent
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.
valsort
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.
FILES
/etc/ldap/slapd.conf
default slapd configuration file
/etc/ldap/slapd.d
default slapd configuration directory
SEE ALSO
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" (http://www.OpenLDAP.org/doc/admin/)
ACKNOWLEDGEMENTS
OpenLDAP Software is developed and maintained by The OpenLDAP Project <http://www.openl‐
dap.org/>. OpenLDAP Software is derived from University of Michigan LDAP 3.3 Release.
OpenLDAP 2014/09/20 SLAPD.OVERLAYS(5)
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