SLAPD.BACKENDS(5)						File Formats Manual						 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  data-
       bases 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       bdb    This  was  the recommended primary backend through OpenLDAP 2.3, but it has since been superseded by the hdb backend.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  Uni-
       versity of Michigan LDAP 3.3 Release.

OpenLDAP							    2012/04/23							 SLAPD.BACKENDS(5)