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.

       asyncmeta
              This  backend  performs  basic  LDAP  proxying with respect to a set of remote LDAP
              servers. It is an enhancement of the ldap backend that operates asynchronously,  to
              prevent tying up slapd threads while waiting for operations to complete.

       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.

       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.

       mdb    This is the recommended primary backend.  This  backend  uses  OpenLDAP's  own  MDB
              transactional database library.  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,   incomplete,  and  deprecated.   It  uses  the
              transactional database interface of the MySQL Cluster Engine (NDB) to  store  data.
              Note  that  Oracle,  which  now  owns MySQL, has withdrawn support for NDB and this
              backend is unlikely to be developed any further.

       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.  This backend is deprecated.

       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.

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

       wiredtiger
              This  backend  is  experimental.   It  services  LDAP  requests  from  a wiredtiger
              database.

FILES

       /etc/ldap/slapd.conf
              default slapd configuration file

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

SEE ALSO

       ldap(3),    slapd-asyncmeta(5),    slapd-config(5),    slapd-dnssrv(5),     slapd-ldap(5),
       slapd-ldif(5), slapd-mdb(5), slapd-meta(5), slapd-monitor(5), slapd-ndb(5), slapd-null(5),
       slapd-passwd(5), slapd-perl(5), slapd-relay(5), slapd-sql(5), slapd-wt(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 the University of Michigan
       LDAP 3.3 Release.