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-<backend>(5)
       manual pages.

       bdb    This was the recommended primary backend through OpenLDAP 2.3, but it has since been superseded by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
              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 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  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 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  Cluster
              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 information
              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/ldap/slapd.conf
              default slapd configuration file

       /etc/ldap/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                                           2012/04/23                                  SLAPD.BACKENDS(5)