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SLAPD.BACKENDS(5)                                                                          SLAPD.BACKENDS(5)



NAME
       slapd.backends - backends for slapd, the stand-alone LDAP daemon

DESCRIPTION
       The  slapd(8) daemon can use a variety of different backends for serving LDAP requests.  Backends may
       be compiled statically into slapd, or when module support is enabled, they may be dynamically loaded.
       Multiple  instances  of  a backend can be configured, to serve separate databases from the same slapd
       server.


       Configuration options for each backend are documented separately in  the  corresponding  slapd-<back-
       end>(5) manual pages.

       bdb    This  was  the  recommended primary backend through OpenLDAP 2.3, but it has since been super-seded superseded
              seded by the hdb backend.  It takes care to configure it properly.  It uses the  transactional
              database interface of the Oracle Berkeley DB (BDB) package to store data.

       config This backend is used to manage the configuration of slapd at run-time.  Unlike other backends,
              only a single instance of the config backend may be defined. It also instantiates itself auto-matically, automatically,
              matically, so it is always present even if not explicitly defined in the slapd.conf(5) file.

       dnssrv This  backend is experimental.  It serves up referrals based upon SRV resource records held in
              the Domain Name System.

       hdb    This is the recommended primary backend for a normal slapd database.  hdb is a variant of  the
              bdb backend that uses a hierarchical database layout.  This layout stores entry DNs more effi-ciently efficiently
              ciently than the bdb backend, using less space and requiring less work to create, delete,  and
              rename entries. It is also one of the few backends to support subtree renames.

       ldap   This backend acts as a proxy to forward incoming requests to another LDAP server.

       ldif   This  database  uses  the  filesystem to build the tree structure of the database, using plain
              ascii files to store data.  Its usage should be limited to very simple databases,  where  per-formance performance
              formance is not a requirement. This backend also supports subtree renames.

       meta   This  backend performs basic LDAP proxying with respect to a set of remote LDAP servers. It is
              an enhancement of the ldap backend.

       monitor
              This backend provides information about the running status of the slapd daemon. Only a  single
              instance of the monitor backend may be defined.

       ndb    This backend is experimental.  It uses the transactional database interface of the MySQL Clus-ter Cluster
              ter Engine (NDB) to store data.

       null   Operations in this backend succeed but do nothing.

       passwd This backend is provided for demonstration purposes only.  It serves up user account  informa-tion information
              tion from the system passwd(5) file.

       perl   This  backend  embeds a perl(1) interpreter into slapd.  It runs Perl subroutines to implement
              LDAP operations.

       relay  This backend is experimental.  It redirects LDAP operations to another database  in  the  same
              server,  based  on  the  naming context of the request.  Its use requires the rwm overlay (see
              slapo-rwm(5) for details) to rewrite the naming context  of  the  request.   It  is  primarily
              intended to implement virtual views on databases that actually store data.

       shell  This  backend  executes  external  programs  to  implement  LDAP  operations.  It is primarily
              intended to be used in prototypes.

       sql    This backend is experimental.  It services LDAP requests from an SQL database.

FILES
       /etc/openldap/slapd.conf
              default slapd configuration file

       /etc/openldap/slapd.d
              default slapd configuration directory

SEE ALSO
       ldap(3), slapd-bdb(5), slapd-config(5), slapd-dnssrv(5), slapd-hdb(5), slapd-ldap(5),  slapd-ldif(5),
       slapd-meta(5),   slapd-monitor(5),  slapd-null(5),  slapd-passwd(5),  slapd-perl(5),  slapd-relay(5),
       slapd-shell(5), slapd-sql(5), slapd.conf(5), slapd.overlays(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.openldap.org/>.
       OpenLDAP Software is derived from University of Michigan LDAP 3.3 Release.



OpenLDAP 2.4.28                                  2011/11/24                                SLAPD.BACKENDS(5)