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


       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-<backend>(5) manual pages.

       bdb    This is the recommended  primary  backend  for  a  normal  slapd
              database.   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
              automatically, 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 a variant of the bdb backend that  uses  a  hierarchical
              database  layout.  This layout stores entry DNs more efficiently
              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 performance 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

              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 Cluster Engine (NDB) to store

       null   Operations in this backend succeed but do nothing.

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

       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.


              default slapd configuration file

              default slapd configuration directory


       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"


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