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NAME | DESCRIPTION | FILES | SEE ALSO | ACKNOWLEDGEMENTS | COLOPHON |
SLAPD.BACKENDS(5) File Formats Manual SLAPD.BACKENDS(5)
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 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but it has since been superseded by the hdb backend.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.
mdb This will soon be the recommended primary backend, superseding
hdb. This backend uses OpenLDAP's own MDB transactional
database library. It is extremely compact and extremely
efficient, delivering much higher performance than the
Berkeley DB backends while using significantly less memory.
Also, unlike Berkeley DB, MDB is crash proof, and requires no
special tuning or maintenance. 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. 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.
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.
ETCDIR/slapd.conf
default slapd configuration file
ETCDIR/slapd.d
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-mdb(5),
slapd-meta(5), slapd-monitor(5), slapd-ndb(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/)
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.
This page is part of the OpenLDAP (an open source implementation of
the Lightweight Directory Access Protocol) project. Information
about the project can be found at ⟨http://www.openldap.org/⟩. If you
have a bug report for this manual page, see
⟨http://www.openldap.org/its/⟩. This page was obtained from the
project's upstream Git repository
⟨git://git.openldap.org/openldap.git⟩ on 2017-07-05. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
OpenLDAP LDVERSION RELEASEDATE SLAPD.BACKENDS(5)
Pages that refer to this page: slapd.conf(5), slapd-config(5), slapd-ldbm(5), slapd.overlays(5)