slapd-config(5) — Linux manual page


SLAPD-CONFIG(5)              File Formats Manual             SLAPD-CONFIG(5)

NAME         top

       slapd-config - configuration backend to slapd

SYNOPSIS         top


DESCRIPTION         top

       The config backend manages all of the configuration information for
       the slapd(8) daemon.  This configuration information is also used by
       the SLAPD tools slapacl(8), slapadd(8), slapauth(8), slapcat(8),
       slapdn(8), slapindex(8), and slaptest(8).

       The config backend is backward compatible with the older
       slapd.conf(5) file but provides the ability to change the
       configuration dynamically at runtime. If slapd is run with only a
       slapd.conf file dynamic changes will be allowed but they will not
       persist across a server restart. Dynamic changes are only saved when
       slapd is running from a slapd.d configuration directory.

       Unlike other backends, there can only be one instance of the config
       backend, and most of its structure is predefined. The root of the
       database is hardcoded to cn=config and this root entry contains
       global settings for slapd. Multiple child entries underneath the root
       entry are used to carry various other settings:

                     dynamically loaded modules

                     schema definitions

                     backend-specific settings

                     database-specific settings

       The cn=Module entries will only appear in configurations where slapd
       was built with support for dynamically loaded modules. There can be
       multiple entries, one for each configured module path. Within each
       entry there will be values recorded for each module loaded on a given
       path. These entries have no children.

       The cn=Schema entry contains all of the hardcoded schema elements.
       The children of this entry contain all user-defined schema elements.
       In schema that were loaded from include files, the child entry will
       be named after the include file from which the schema was loaded.
       Typically the first child in this subtree will be

       olcBackend entries are for storing settings specific to a single
       backend type (and thus global to all database instances of that
       type).  At present there are no backends that implement settings of
       this nature, so usually there will not be any olcBackend entries.

       olcDatabase entries store settings specific to a single database
       instance. These entries may have olcOverlay child entries
       corresponding to any overlays configured on the database. The
       olcDatabase and olcOverlay entries may also have miscellaneous child
       entries for other settings as needed. There are two special database
       entries that are predefined - one is an entry for the config database
       itself, and the other is for the "frontend" database. Settings in the
       frontend database are inherited by the other databases, unless they
       are explicitly overridden in a specific database.

       The specific configuration options available are discussed below in
       the Global Configuration Options, General Backend Options, and
       General Database Options. Options are set by defining LDAP attributes
       with specific values.  In general the names of the LDAP attributes
       are the same as the corresponding slapd.conf keyword, with an "olc"
       prefix added on.

       The parser for many of these attributes is the same as used for
       parsing the slapd.conf keywords. As such, slapd.conf keywords that
       allow multiple items to be specified on one line, separated by
       whitespace, will allow multiple items to be specified in one
       attribute value. However, when reading the attribute via LDAP, the
       items will be returned as individual attribute values.

       Backend-specific options are discussed in the slapd-<backend>(5)
       manual pages.  Refer to the "OpenLDAP Administrator's Guide" for more
       details on configuring slapd.


       Options described in this section apply to the server as a whole.
       Arguments that should be replaced by actual text are shown in
       brackets <>.

       These options may only be specified in the cn=config entry. This
       entry must have an objectClass of olcGlobal.

       olcAllows: <features>
              Specify a set of features to allow (default none).  bind_v2
              allows acceptance of LDAPv2 bind requests.  Note that slapd(8)
              does not truly implement LDAPv2 (RFC 1777), now Historic (RFC
              3494).  bind_anon_cred allows anonymous bind when credentials
              are not empty (e.g.  when DN is empty).  bind_anon_dn allows
              unauthenticated (anonymous) bind when DN is not empty.
              update_anon allows unauthenticated (anonymous) update
              operations to be processed (subject to access controls and
              other administrative limits).  proxy_authz_anon allows
              unauthenticated (anonymous) proxy authorization control to be
              processed (subject to access controls, authorization and other
              administrative limits).

       olcArgsFile: <filename>
              The (absolute) name of a file that will hold the slapd
              server's command line (program name and options).

       olcAttributeOptions: <option-name>...
              Define tagging attribute options or option tag/range prefixes.
              Options must not end with `-', prefixes must end with `-'.
              The `lang-' prefix is predefined.  If you use the
              olcAttributeOptions directive, `lang-' will no longer be
              defined and you must specify it explicitly if you want it

              An attribute description with a tagging option is a subtype of
              that attribute description without the option.  Except for
              that, options defined this way have no special semantics.
              Prefixes defined this way work like the `lang-' options: They
              define a prefix for tagging options starting with the prefix.
              That is, if you define the prefix `x-foo-', you can use the
              option `x-foo-bar'.  Furthermore, in a search or compare, a
              prefix or range name (with a trailing `-') matches all options
              starting with that name, as well as the option with the range
              name sans the trailing `-'.  That is, `x-foo-bar-' matches
              `x-foo-bar' and `x-foo-bar-baz'.

              RFC 4520 reserves options beginning with `x-' for private
              experiments.  Other options should be registered with IANA,
              see RFC 4520 section 3.5.  OpenLDAP also has the `binary'
              option built in, but this is a transfer option, not a tagging

       olcAuthIDRewrite: <rewrite-rule>
              Used by the authentication framework to convert simple user
              names to an LDAP DN used for authorization purposes.  Its
              purpose is analogous to that of olcAuthzRegexp (see below).
              The rewrite-rule is a set of rules analogous to those
              described in slapo-rwm(5) for data rewriting (after stripping
              the rwm- prefix).  olcAuthIDRewrite and olcAuthzRegexp should
              not be intermixed.

       olcAuthzPolicy: <policy>
              Used to specify which rules to use for Proxy Authorization.
              Proxy authorization allows a client to authenticate to the
              server using one user's credentials, but specify a different
              identity to use for authorization and access control purposes.
              It essentially allows user A to login as user B, using user
              A's password.  The none flag disables proxy authorization.
              This is the default setting.  The from flag will use rules in
              the authzFrom attribute of the authorization DN.  The to flag
              will use rules in the authzTo attribute of the authentication
              DN.  The any flag, an alias for the deprecated value of both,
              will allow any of the above, whatever succeeds first (checked
              in to, from sequence.  The all flag requires both
              authorizations to succeed.

              The rules are mechanisms to specify which identities are
              allowed to perform proxy authorization.  The authzFrom
              attribute in an entry specifies which other users are allowed
              to proxy login to this entry. The authzTo attribute in an
              entry specifies which other users this user can authorize as.
              Use of authzTo rules can be easily abused if users are allowed
              to write arbitrary values to this attribute.  In general the
              authzTo attribute must be protected with ACLs such that only
              privileged users can modify it.  The value of authzFrom and
              authzTo describes an identity or a set of identities; it can
              take five forms:



              The first form is a valid LDAP URI where the <host>:<port>,
              the <attrs> and the <extensions> portions must be absent, so
              that the search occurs locally on either authzFrom or authzTo.
              The second form is a DN, with the optional style modifiers
              exact, onelevel, children, and subtree for exact, onelevel,
              children and subtree matches, which cause <pattern> to be
              normalized according to the DN normalization rules, or the
              special regex style, which causes the <pattern> to be treated
              as a POSIX (''extended'') regular expression, as discussed in
              regex(7) and/or re_format(7).  A pattern of * means any non-
              anonymous DN.  The third form is a SASL id, with the optional
              fields <mech> and <realm> that allow to specify a SASL
              mechanism, and eventually a SASL realm, for those mechanisms
              that support one.  The need to allow the specification of a
              mechanism is still debated, and users are strongly discouraged
              to rely on this possibility.  The fourth form is a group
              specification, consisting of the keyword group, optionally
              followed by the specification of the group objectClass and
              member attributeType.  The group with DN <pattern> is searched
              with base scope, and in case of match, the values of the
              member attributeType are searched for the asserted DN.  For
              backwards compatibility, if no identity type is provided, i.e.
              only <pattern> is present, an exact DN is assumed; as a
              consequence, <pattern> is subjected to DN normalization.
              Since the interpretation of authzFrom and authzTo can impact
              security, users are strongly encouraged to explicitly set the
              type of identity specification that is being used.  A subset
              of these rules can be used as third arg in the olcAuthzRegexp
              statement (see below); significantly, the URI and the
              dn.exact:<dn> forms.

       olcAuthzRegexp: <match> <replace>
              Used by the authentication framework to convert simple user
              names, such as provided by SASL subsystem, to an LDAP DN used
              for authorization purposes.  Note that the resultant DN need
              not refer to an existing entry to be considered valid.  When
              an authorization request is received from the SASL subsystem,
              the SASL USERNAME, REALM, and MECHANISM are taken, when
              available, and combined into a name of the form


              This name is then compared against the match POSIX
              (''extended'') regular expression, and if the match is
              successful, the name is replaced with the replace string.  If
              there are wildcard strings in the match regular expression
              that are enclosed in parenthesis, e.g.


              then the portion of the name that matched the wildcard will be
              stored in the numbered placeholder variable $1. If there are
              other wildcard strings in parenthesis, the matching strings
              will be in $2, $3, etc. up to $9. The placeholders can then be
              used in the replace string, e.g.


              The replaced name can be either a DN, i.e. a string prefixed
              by "dn:", or an LDAP URI.  If the latter, the server will use
              the URI to search its own database(s) and, if the search
              returns exactly one entry, the name is replaced by the DN of
              that entry.   The LDAP URI must have no hostport, attrs, or
              extensions components, but the filter is mandatory, e.g.


              The protocol portion of the URI must be strictly ldap.  Note
              that this search is subject to access controls.  Specifically,
              the authentication identity must have "auth" access in the

              Multiple olcAuthzRegexp values can be specified to allow for
              multiple matching and replacement patterns. The matching
              patterns are checked in the order they appear in the
              attribute, stopping at the first successful match.

       olcConcurrency: <integer>
              Specify a desired level of concurrency.  Provided to the
              underlying thread system as a hint.  The default is not to
              provide any hint. This setting is only meaningful on some
              platforms where there is not a one to one correspondence
              between user threads and kernel threads.

       olcConnMaxPending: <integer>
              Specify the maximum number of pending requests for an
              anonymous session.  If requests are submitted faster than the
              server can process them, they will be queued up to this limit.
              If the limit is exceeded, the session is closed. The default
              is 100.

       olcConnMaxPendingAuth: <integer>
              Specify the maximum number of pending requests for an
              authenticated session.  The default is 1000.

       olcDisallows: <features>
              Specify a set of features to disallow (default none).
              bind_anon disables acceptance of anonymous bind requests.
              Note that this setting does not prohibit anonymous directory
              access (See "require authc").  bind_simple disables simple
              (bind) authentication.  tls_2_anon disables forcing session to
              anonymous status (see also tls_authc) upon StartTLS operation
              receipt.  tls_authc disallows the StartTLS operation if
              authenticated (see also tls_2_anon).  proxy_authz_non_critical
              disables acceptance of the proxied authorization control
              (RFC4370) with criticality set to FALSE.
              dontusecopy_non_critical disables acceptance of the
              dontUseCopy control (a work in progress) with criticality set
              to FALSE.

       olcGentleHUP: { TRUE | FALSE }
              A SIGHUP signal will only cause a 'gentle' shutdown-attempt:
              Slapd will stop listening for new connections, but will not
              close the connections to the current clients.  Future write
              operations return unwilling-to-perform, though.  Slapd
              terminates when all clients have closed their connections (if
              they ever do), or - as before - if it receives a SIGTERM
              signal.  This can be useful if you wish to terminate the
              server and start a new slapd server with another database,
              without disrupting the currently active clients.  The default
              is FALSE.  You may wish to use olcIdleTimeout along with this

       olcIdleTimeout: <integer>
              Specify the number of seconds to wait before forcibly closing
              an idle client connection.  A setting of 0 disables this
              feature.  The default is 0. You may also want to set the
              olcWriteTimeout option.

       olcIndexHash64: { on | off }
              Use a 64 bit hash for indexing. The default is to use 32 bit
              hashes.  These hashes are used for equality and substring
              indexing. The 64 bit version may be needed to avoid index
              collisions when the number of indexed values exceeds ~64
              million. (Note that substring indexing generates multiple
              index values per actual attribute value.)  Indices generated
              with 32 bit hashes are incompatible with the 64 bit version,
              and vice versa. Any existing databases must be fully reloaded
              when changing this setting. This directive is only supported
              on 64 bit CPUs.

       olcIndexIntLen: <integer>
              Specify the key length for ordered integer indices. The most
              significant bytes of the binary integer will be used for index
              keys. The default value is 4, which provides exact indexing
              for 31 bit values.  A floating point representation is used to
              index too large values.

       olcIndexSubstrIfMaxlen: <integer>
              Specify the maximum length for subinitial and subfinal
              indices. Only this many characters of an attribute value will
              be processed by the indexing functions; any excess characters
              are ignored. The default is 4.

       olcIndexSubstrIfMinlen: <integer>
              Specify the minimum length for subinitial and subfinal
              indices. An attribute value must have at least this many
              characters in order to be processed by the indexing functions.
              The default is 2.

       olcIndexSubstrAnyLen: <integer>
              Specify the length used for subany indices. An attribute value
              must have at least this many characters in order to be
              processed. Attribute values longer than this length will be
              processed in segments of this length. The default is 4. The
              subany index will also be used in subinitial and subfinal
              index lookups when the filter string is longer than the
              olcIndexSubstrIfMaxlen value.

       olcIndexSubstrAnyStep: <integer>
              Specify the steps used in subany index lookups. This value
              sets the offset for the segments of a filter string that are
              processed for a subany index lookup. The default is 2. For
              example, with the default values, a search using this filter
              "cn=*abcdefgh*" would generate index lookups for "abcd",
              "cdef", and "efgh".

       Note: Indexing support depends on the particular backend in use.
       Also, changing these settings will generally require deleting any
       indices that depend on these parameters and recreating them with

       olcListenerThreads: <integer>
              Specify the number of threads to use for the connection
              manager.  The default is 1 and this is typically adequate for
              up to 16 CPU cores.  The value should be set to a power of 2.

       olcLocalSSF: <SSF>
              Specifies the Security Strength Factor (SSF) to be given local
              LDAP sessions, such as those to the ldapi:// listener.  For a
              description of SSF values, see olcSaslSecProps's minssf option
              description.  The default is 71.

       olcLogFile: <filename>
              Specify a file for recording debug log messages. By default
              these messages only go to stderr and are not recorded anywhere
              else. Specifying a logfile copies messages to both stderr and
              the logfile.

       olcLogLevel: <integer> [...]
              Specify the level at which debugging statements and operation
              statistics should be syslogged (currently logged to the
              syslogd(8) LOG_LOCAL4 facility).  They must be considered
              subsystems rather than increasingly verbose log levels.  Some
              messages with higher priority are logged regardless of the
              configured loglevel as soon as any logging is configured.  Log
              levels are additive, and available levels are:
                     1      (0x1 trace) trace function calls
                     2      (0x2 packets) debug packet handling
                     4      (0x4 args) heavy trace debugging (function args)
                     8      (0x8 conns) connection management
                     16     (0x10 BER) print out packets sent and received
                     32     (0x20 filter) search filter processing
                     64     (0x40 config) configuration file processing
                     128    (0x80 ACL) access control list processing
                     256    (0x100 stats) stats log
                     512    (0x200 stats2) stats log entries sent
                     1024   (0x400 shell) print communication with shell
                     2048   (0x800 parse) entry parsing

                     16384  (0x4000 sync) LDAPSync replication
                     32768  (0x8000 none) only messages that get logged
                            whatever log level is set
              The desired log level can be input as a single integer that
              combines the (ORed) desired levels, both in decimal or in
              hexadecimal notation, as a list of integers (that are ORed
              internally), or as a list of the names that are shown between
              parenthesis, such that

                  olcLogLevel: 129
                  olcLogLevel: 0x81
                  olcLogLevel: 128 1
                  olcLogLevel: 0x80 0x1
                  olcLogLevel: acl trace

              are equivalent.  The keyword any can be used as a shortcut to
              enable logging at all levels (equivalent to -1).  The keyword
              none, or the equivalent integer representation, causes those
              messages that are logged regardless of the configured
              olcLogLevel to be logged.  In fact, if no olcLogLevel (or a 0
              level) is defined, no logging occurs, so at least the none
              level is required to have high priority messages logged.

       olcPasswordCryptSaltFormat: <format>
              Specify the format of the salt passed to crypt(3) when
              generating {CRYPT} passwords (see olcPasswordHash) during
              processing of LDAP Password Modify Extended Operations (RFC

              This string needs to be in sprintf(3) format and may include
              one (and only one) %s conversion.  This conversion will be
              substituted with a string of random characters from
              [A-Za-z0-9./].  For example, "%.2s" provides a two character
              salt and "$1$%.8s" tells some versions of crypt(3) to use an
              MD5 algorithm and provides 8 random characters of salt.  The
              default is "%s", which provides 31 characters of salt.

       olcPidFile: <filename>
              The (absolute) name of a file that will hold the slapd
              server's process ID (see getpid(2)).

       olcPluginLogFile: <filename>
              The ( absolute ) name of a file that will contain log messages
              from SLAPI plugins. See slapd.plugin(5) for details.

       olcReferral: <url>
              Specify the referral to pass back when slapd(8) cannot find a
              local database to handle a request.  If multiple values are
              specified, each url is provided.

       olcReverseLookup: TRUE | FALSE
              Enable/disable client name unverified reverse lookup (default
              is FALSE if compiled with --enable-rlookups).

       olcRootDSE: <file>
              Specify the name of an LDIF(5) file containing user defined
              attributes for the root DSE.  These attributes are returned in
              addition to the attributes normally produced by slapd.

              The root DSE is an entry with information about the server and
              its capabilities, in operational attributes.  It has the empty
              DN, and can be read with e.g.:
                  ldapsearch -x -b "" -s base "+"
              See RFC 4512 section 5.1 for details.

       olcSaslAuxprops: <plugin> [...]
              Specify which auxprop plugins to use for authentication
              lookups. The default is empty, which just uses slapd's
              internal support. Usually no other auxprop plugins are needed.

       olcSaslAuxpropsDontUseCopy: <attr> [...]
              Specify which attribute(s) should be subject to the don't use
              copy control. This is necessary for some SASL mechanisms such
              as OTP to work in a replicated environment. The attribute
              "cmusaslsecretOTP" is the default value.

       olcSaslAuxpropsDontUseCopyIgnore TRUE | FALSE
              Used to disable replication of the attribute(s) defined by
              olcSaslAuxpropsDontUseCopy and instead use a local value for
              the attribute. This allows the SASL mechanism to continue to
              work if the provider is offline. This can cause replication
              inconsistency. Defaults to FALSE.

       olcSaslHost: <fqdn>
              Used to specify the fully qualified domain name used for SASL

       olcSaslRealm: <realm>
              Specify SASL realm.  Default is empty.

       olcSaslCbinding: none | tls-unique | tls-endpoint
              Specify the channel-binding type, see also
              LDAP_OPT_X_SASL_CBINDING.  Default is none.

       olcSaslSecProps: <properties>
              Used to specify Cyrus SASL security properties.  The none flag
              (without any other properties) causes the flag properties
              default, "noanonymous,noplain", to be cleared.  The noplain
              flag disables mechanisms susceptible to simple passive
              attacks.  The noactive flag disables mechanisms susceptible to
              active attacks.  The nodict flag disables mechanisms
              susceptible to passive dictionary attacks.  The noanonymous
              flag disables mechanisms which support anonymous login.  The
              forwardsec flag require forward secrecy between sessions.  The
              passcred require mechanisms which pass client credentials (and
              allow mechanisms which can pass credentials to do so).  The
              minssf=<factor> property specifies the minimum acceptable
              security strength factor as an integer approximate to
              effective key length used for encryption.  0 (zero) implies no
              protection, 1 implies integrity protection only, 56 allows DES
              or other weak ciphers, 112 allows triple DES and other strong
              ciphers, 128 allows RC4, Blowfish and other modern strong
              ciphers.  The default is 0.  The maxssf=<factor> property
              specifies the maximum acceptable security strength factor as
              an integer (see minssf description).  The default is INT_MAX.
              The maxbufsize=<size> property specifies the maximum security
              layer receive buffer size allowed.  0 disables security
              layers.  The default is 65536.

       olcServerID: <integer> [<URL>]
              Specify an integer ID from 0 to 4095 for this server (limited
              to 3 hexadecimal digits).  The ID may also be specified as a
              hexadecimal ID by prefixing the value with "0x".  Non-zero IDs
              are required when using multi-provider replication and each
              provider must have a unique non-zero ID. Note that this
              requirement also applies to separate providers contributing to
              a glued set of databases.  If the URL is provided, this
              directive may be specified multiple times, providing a
              complete list of participating servers and their IDs. The
              fully qualified hostname of each server should be used in the
              supplied URLs. The IDs are used in the "replica id" field of
              all CSNs generated by the specified server. The default value
              is zero, which is only valid for single provider replication.

            olcServerID: 1 ldap://
            olcServerID: 2 ldap://

       olcSockbufMaxIncoming: <integer>
              Specify the maximum incoming LDAP PDU size for anonymous
              sessions.  The default is 262143.

       olcSockbufMaxIncomingAuth: <integer>
              Specify the maximum incoming LDAP PDU size for authenticated
              sessions.  The default is 4194303.

       olcTCPBuffer [listener=<URL>] [{read|write}=]<size>
              Specify the size of the TCP buffer.  A global value for both
              read and write TCP buffers related to any listener is defined,
              unless the listener is explicitly specified, or either the
              read or write qualifiers are used.  See tcp(7) for details.
              Note that some OS-es implement automatic TCP buffer tuning.

       olcThreads: <integer>
              Specify the maximum size of the primary thread pool.  The
              default is 16; the minimum value is 2.

       olcThreadQueues: <integer>
              Specify the number of work queues to use for the primary
              thread pool.  The default is 1 and this is typically adequate
              for up to 8 CPU cores.  The value should not exceed the number
              of CPUs in the system.

       olcToolThreads: <integer>
              Specify the maximum number of threads to use in tool mode.
              This should not be greater than the number of CPUs in the
              system.  The default is 1.

       olcWriteTimeout: <integer>
              Specify the number of seconds to wait before forcibly closing
              a connection with an outstanding write.  This allows recovery
              from various network hang conditions.  A setting of 0 disables
              this feature.  The default is 0.

TLS OPTIONS         top

       If slapd is built with support for Transport Layer Security, there
       are more options you can specify.

       olcTLSCipherSuite: <cipher-suite-spec>
              Permits configuring what ciphers will be accepted and the
              preference order.  <cipher-suite-spec> should be a cipher
              specification for the TLS library in use (OpenSSL or GnuTLS).

                            olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2

                            olcTLSCiphersuite: SECURE256:!AES-128-CBC

              To check what ciphers a given spec selects in OpenSSL, use:

                   openssl ciphers -v <cipher-suite-spec>

              With GnuTLS the available specs can be found in the manual
              page of gnutls-cli(1) (see the description of the option

              In older versions of GnuTLS, where gnutls-cli does not support
              the option --priority, you can obtain the — more limited —
              list of ciphers by calling:

                   gnutls-cli -l

       olcTLSCACertificateFile: <filename>
              Specifies the file that contains certificates for all of the
              Certificate Authorities that slapd will recognize.

       olcTLSCACertificatePath: <path>
              Specifies the path of a directory that contains Certificate
              Authority certificates in separate individual files. Usually
              only one of this or the olcTLSCACertificateFile is defined. If
              both are specified, both locations will be used.

       olcTLSCertificateFile: <filename>
              Specifies the file that contains the slapd server certificate.

       olcTLSCertificateKeyFile: <filename>
              Specifies the file that contains the slapd server private key
              that matches the certificate stored in the
              olcTLSCertificateFile file. If the private key is protected
              with a password, the password must be manually typed in when
              slapd starts.  Usually the private key is not protected with a
              password, to allow slapd to start without manual intervention,
              so it is of critical importance that the file is protected

       olcTLSDHParamFile: <filename>
              This directive specifies the file that contains parameters for
              Diffie-Hellman ephemeral key exchange.  This is required in
              order to use a DSA certificate on the server, or an RSA
              certificate missing the "key encipherment" key usage.  Note
              that setting this option may also enable Anonymous Diffie-
              Hellman key exchanges in certain non-default cipher suites.
              Anonymous key exchanges should generally be avoided since they
              provide no actual client or server authentication and provide
              no protection against man-in-the-middle attacks.  You should
              append "!ADH" to your cipher suites to ensure that these
              suites are not used.

       olcTLSECName: <name>
              Specify the name of the curve(s) to use for Elliptic curve
              Diffie-Hellman ephemeral key exchange.  This option is only
              used for OpenSSL.  This option is not used with GnuTLS; the
              curves may be chosen in the GnuTLS ciphersuite specification.

       olcTLSProtocolMin: <major>[.<minor>]
              Specifies minimum SSL/TLS protocol version that will be
              negotiated.  If the server doesn't support at least that
              version, the SSL handshake will fail.  To require TLS 1.x or
              higher, set this option to 3.(x+1), e.g.,

                   olcTLSProtocolMin: 3.2

              would require TLS 1.1.  Specifying a minimum that is higher
              than that supported by the OpenLDAP implementation will result
              in it requiring the highest level that it does support.  This
              directive is ignored with GnuTLS.

       olcTLSRandFile: <filename>
              Specifies the file to obtain random bits from when
              /dev/[u]random is not available.  Generally set to the name of
              the EGD/PRNGD socket.  The environment variable RANDFILE can
              also be used to specify the filename.  This directive is
              ignored with GnuTLS.

       olcTLSVerifyClient: <level>
              Specifies what checks to perform on client certificates in an
              incoming TLS session, if any.  The <level> can be specified as
              one of the following keywords:

              never  This is the default.  slapd will not ask the client for
                     a certificate.

              allow  The client certificate is requested.  If no certificate
                     is provided, the session proceeds normally.  If a bad
                     certificate is provided, it will be ignored and the
                     session proceeds normally.

              try    The client certificate is requested.  If no certificate
                     is provided, the session proceeds normally.  If a bad
                     certificate is provided, the session is immediately

              demand | hard | true
                     These keywords are all equivalent, for compatibility
                     reasons.  The client certificate is requested.  If no
                     certificate is provided, or a bad certificate is
                     provided, the session is immediately terminated.

                     Note that a valid client certificate is required in
                     order to use the SASL EXTERNAL authentication mechanism
                     with a TLS session.  As such, a non-default
                     olcTLSVerifyClient setting must be chosen to enable
                     SASL EXTERNAL authentication.

       olcTLSCRLCheck: <level>
              Specifies if the Certificate Revocation List (CRL) of the CA
              should be used to verify if the client certificates have not
              been revoked. This requires olcTLSCACertificatePath parameter
              to be set. This parameter is ignored with GnuTLS.  <level> can
              be specified as one of the following keywords:

              none   No CRL checks are performed

              peer   Check the CRL of the peer certificate

              all    Check the CRL for a whole certificate chain

       olcTLSCRLFile: <filename>
              Specifies a file containing a Certificate Revocation List to
              be used for verifying that certificates have not been revoked.
              This parameter is only valid when using GnuTLS.


       If slapd is compiled with --enable-modules then the module-related
       entries will be available. These entries are named
       cn=module{x},cn=config and must have the olcModuleList objectClass.
       One entry should be created per olcModulePath.  Normally the config
       engine generates the "{x}" index in the RDN automatically, so it can
       be omitted when initially loading these entries.

       olcModuleLoad: <filename>
              Specify the name of a dynamically loadable module to load. The
              filename may be an absolute path name or a simple filename.
              Non-absolute names are searched for in the directories
              specified by the olcModulePath option.

       olcModulePath: <pathspec>
              Specify a list of directories to search for loadable modules.
              Typically the path is colon-separated but this depends on the
              operating system.  The default is MODULEDIR, which is where
              the standard OpenLDAP install will place its modules.

SCHEMA OPTIONS         top

       Schema definitions are created as entries in the cn=schema,cn=config
       subtree. These entries must have the olcSchemaConfig objectClass.  As
       noted above, the actual cn=schema,cn=config entry is predefined and
       any values specified for it are ignored.

       olcAttributetypes: ( <oid> [NAME <name>] [DESC <description>]
              [OBSOLETE] [SUP <oid>] [EQUALITY <oid>] [ORDERING <oid>]
              [SUBSTR <oid>] [SYNTAX <oidlen>] [SINGLE-VALUE] [COLLECTIVE]
              [NO-USER-MODIFICATION] [USAGE <attributeUsage>] )
              Specify an attribute type using the LDAPv3 syntax defined in
              RFC 4512.  The slapd parser extends the RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for
              the attribute OID and attribute syntax OID.  (See the
              olcObjectIdentifier description.)

       olcDitContentRules: ( <oid> [NAME <name>] [DESC <description>]
              [OBSOLETE] [AUX <oids>] [MUST <oids>] [MAY <oids>]
              [NOT <oids>] )
              Specify an DIT Content Rule using the LDAPv3 syntax defined in
              RFC 4512.  The slapd parser extends the RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for
              the attribute OID and attribute syntax OID.  (See the
              olcObjectIdentifier description.)

       olcObjectClasses: ( <oid> [NAME <name>] [DESC <description>]
              }] [MUST <oids>] [MAY <oids>] )
              Specify an objectclass using the LDAPv3 syntax defined in RFC
              4512.  The slapd parser extends the RFC 4512 definition by
              allowing string forms as well as numeric OIDs to be used for
              the object class OID.  (See the olcObjectIdentifier
              description.)  Object classes are "STRUCTURAL" by default.

       olcObjectIdentifier: <name> { <oid> | <name>[:<suffix>] }
              Define a string name that equates to the given OID. The string
              can be used in place of the numeric OID in objectclass and
              attribute definitions. The name can also be used with a suffix
              of the form ":xx" in which case the value "oid.xx" will be


       Options in these entries only apply to the configuration of a single
       type of backend. All backends may support this class of options, but
       currently none do.  The entry must be named
       olcBackend=<databasetype>,cn=config and must have the
       olcBackendConfig objectClass.  <databasetype> should be one of
       config, dnssrv, ldap, ldif, mdb, meta, monitor, ndb, null, passwd,
       perl, relay, shell, or sql.  At present, no backend implements any
       options of this type, so this entry should not be used.


       Database options are set in entries named
       olcDatabase={x}<databasetype>,cn=config and must have the
       olcDatabaseConfig objectClass. Normally the config engine generates
       the "{x}" index in the RDN automatically, so it can be omitted when
       initially loading these entries.

       The special frontend database is always numbered "{-1}" and the
       config database is always numbered "{0}".


       Options in this section may be set in the special "frontend" database
       and inherited in all the other databases. These options may be
       altered by further settings in each specific database. The frontend
       entry must be named olcDatabase=frontend,cn=config and must have the
       olcFrontendConfig objectClass.

       olcAccess: to <what> [ by <who> <access> <control> ]+
              Grant access (specified by <access>) to a set of entries
              and/or attributes (specified by <what>) by one or more
              requestors (specified by <who>).  If no access controls are
              present, the default policy allows anyone and everyone to read
              anything but restricts updates to rootdn.  (e.g., "olcAccess:
              to * by * read").  See slapd.access(5) and the "OpenLDAP
              Administrator's Guide" for details.

              Access controls set in the frontend are appended to any access
              controls set on the specific databases.  The rootdn of a
              database can always read and write EVERYTHING in that

              Extra special care must be taken with the access controls on
              the config database. Unlike other databases, the default
              policy for the config database is to only allow access to the
              rootdn. Regular users should not have read access, and write
              access should be granted very carefully to privileged

       olcDefaultSearchBase: <dn>
              Specify a default search base to use when client submits a
              non-base search request with an empty base DN.  Base scoped
              search requests with an empty base DN are not affected.  This
              setting is only allowed in the frontend entry.

       olcExtraAttrs: <attr>
              Lists what attributes need to be added to search requests.
              Local storage backends return the entire entry to the
              frontend.  The frontend takes care of only returning the
              requested attributes that are allowed by ACLs.  However,
              features like access checking and so may need specific
              attributes that are not automatically returned by remote
              storage backends, like proxy backends and so on.  <attr> is an
              attribute that is needed for internal purposes and thus always
              needs to be collected, even when not explicitly requested by
              clients.  This attribute is multi-valued.

       olcPasswordHash: <hash> [<hash>...]
              This option configures one or more hashes to be used in
              generation of user passwords stored in the userPassword
              attribute during processing of LDAP Password Modify Extended
              Operations (RFC 3062).  The <hash> must be one of {SSHA},
              {SHA}, {SMD5}, {MD5}, {CRYPT}, and {CLEARTEXT}.  The default
              is {SSHA}.

              {SHA} and {SSHA} use the SHA-1 algorithm (FIPS 160-1), the
              latter with a seed.

              {MD5} and {SMD5} use the MD5 algorithm (RFC 1321), the latter
              with a seed.

              {CRYPT} uses the crypt(3).

              {CLEARTEXT} indicates that the new password should be added to
              userPassword as clear text.

              Note that this option does not alter the normal user
              applications handling of userPassword during LDAP Add, Modify,
              or other LDAP operations.  This setting is only allowed in the
              frontend entry.

       olcReadOnly: TRUE | FALSE
              This option puts the database into "read-only" mode.  Any
              attempts to modify the database will return an "unwilling to
              perform" error.  By default, olcReadOnly is FALSE. Note that
              when this option is set TRUE on the frontend, it cannot be
              reset without restarting the server, since further writes to
              the config database will be rejected.

       olcRequires: <conditions>
              Specify a set of conditions to require (default none).  The
              directive may be specified globally and/or per-database;
              databases inherit global conditions, so per-database
              specifications are additive.  bind requires bind operation
              prior to directory operations.  LDAPv3 requires session to be
              using LDAP version 3.  authc requires authentication prior to
              directory operations.  SASL requires SASL authentication prior
              to directory operations.  strong requires strong
              authentication prior to directory operations.  The strong
              keyword allows protected "simple" authentication as well as
              SASL authentication.  none may be used to require no
              conditions (useful to clear out globally set conditions within
              a particular database); it must occur first in the list of

       olcRestrict: <oplist>
              Specify a list of operations that are restricted.
              Restrictions on a specific database override any frontend
              setting.  Operations can be any of add, bind, compare, delete,
              extended[=<OID>], modify, rename, search, or the special
              pseudo-operations read and write, which respectively summarize
              read and write operations.  The use of restrict write is
              equivalent to olcReadOnly: TRUE (see above).  The extended
              keyword allows one to indicate the OID of the specific
              operation to be restricted.

       olcSchemaDN: <dn>
              Specify the distinguished name for the subschema subentry that
              controls the entries on this server.  The default is

       olcSecurity: <factors>
              Specify a set of security strength factors (separated by white
              space) to require (see olcSaslSecprops's minssf option for a
              description of security strength factors).  The directive may
              be specified globally and/or per-database.  ssf=<n> specifies
              the overall security strength factor.  transport=<n> specifies
              the transport security strength factor.  tls=<n> specifies the
              TLS security strength factor.  sasl=<n> specifies the SASL
              security strength factor.  update_ssf=<n> specifies the
              overall security strength factor to require for directory
              updates.  update_transport=<n> specifies the transport
              security strength factor to require for directory updates.
              update_tls=<n> specifies the TLS security strength factor to
              require for directory updates.  update_sasl=<n> specifies the
              SASL security strength factor to require for directory
              updates.  simple_bind=<n> specifies the security strength
              factor required for simple username/password authentication.
              Note that the transport factor is measure of security provided
              by the underlying transport, e.g. ldapi:// (and eventually
              IPSEC).  It is not normally used.

       olcSizeLimit: {<integer>|unlimited}

       olcSizeLimit: size[.{soft|hard|unchecked}]=<integer> [...]
              Specify the maximum number of entries to return from a search
              operation.  The default size limit is 500.  Use unlimited to
              specify no limits.  The second format allows a fine grain
              setting of the size limits.  Extra args can be added in the
              same value. See olcLimits for an explanation of the different

       olcSortVals: <attr> [...]
              Specify a list of multi-valued attributes whose values will
              always be maintained in sorted order. Using this option will
              allow Modify, Compare, and filter evaluations on these
              attributes to be performed more efficiently. The resulting
              sort order depends on the attributes' syntax and matching
              rules and may not correspond to lexical order or any other
              recognizable order.  This setting is only allowed in the
              frontend entry.

       olcTimeLimit: {<integer>|unlimited}

       olcTimeLimit: time[.{soft|hard}]=<integer> [...]
              Specify the maximum number of seconds (in real time) slapd
              will spend answering a search request.  The default time limit
              is 3600.  Use unlimited to specify no limits.  The second
              format allows a fine grain setting of the time limits.  Extra
              args can be added in the same value. See olcLimits for an
              explanation of the different flags.


       Options in this section only apply to the specific database for which
       they are defined.  They are supported by every type of backend. All
       of the Global Database Options may also be used here.

       olcAddContentAcl: TRUE | FALSE
              Controls whether Add operations will perform ACL checks on the
              content of the entry being added. This check is off by
              default. See the slapd.access(5) manual page for more details
              on ACL requirements for Add operations.

       olcHidden: TRUE | FALSE
              Controls whether the database will be used to answer queries.
              A database that is hidden will never be selected to answer any
              queries, and any suffix configured on the database will be
              ignored in checks for conflicts with other databases. By
              default, olcHidden is FALSE.

       olcLastMod: TRUE | FALSE
              Controls whether slapd will automatically maintain the
              modifiersName, modifyTimestamp, creatorsName, and
              createTimestamp attributes for entries. It also controls the
              entryCSN and entryUUID attributes, which are needed by the
              syncrepl provider. By default, olcLastMod is TRUE.

       olcLastBind: TRUE | FALSE
              Controls whether slapd will automatically maintain the
              pwdLastSuccess attribute for entries. By default, olcLastBind
              is FALSE.

       olcLimits: <selector> <limit> [<limit> [...]]
              Specify time and size limits based on the operation's
              initiator or base DN.  The argument <selector> can be any of

                     anonymous | users | [<dnspec>=]<pattern> |


                     <dnspec> ::= dn[.<type>][.<style>]

                     <type>  ::= self | this

                     <style> ::= exact | base | onelevel | subtree |
                     children | regex | anonymous

              DN type self is the default and means the bound user, while
              this means the base DN of the operation.  The term anonymous
              matches all unauthenticated clients.  The term users matches
              all authenticated clients; otherwise an exact dn pattern is
              assumed unless otherwise specified by qualifying the
              (optional) key string dn with exact or base (which are
              synonyms), to require an exact match; with onelevel, to
              require exactly one level of depth match; with subtree, to
              allow any level of depth match, including the exact match;
              with children, to allow any level of depth match, not
              including the exact match; regex explicitly requires the
              (default) match based on POSIX (''extended'') regular
              expression pattern.  Finally, anonymous matches unbound
              operations; the pattern field is ignored.  The same behavior
              is obtained by using the anonymous form of the <selector>
              clause.  The term group, with the optional objectClass oc and
              attributeType at fields, followed by pattern, sets the limits
              for any DN listed in the values of the at attribute (default
              member) of the oc group objectClass (default groupOfNames)
              whose DN exactly matches pattern.

              The currently supported limits are size and time.

              The syntax for time limits is time[.{soft|hard}]=<integer>,
              where integer is the number of seconds slapd will spend
              answering a search request.  If no time limit is explicitly
              requested by the client, the soft limit is used; if the
              requested time limit exceeds the hard limit, the value of the
              limit is used instead.  If the hard limit is set to the
              keyword soft, the soft limit is used in either case; if it is
              set to the keyword unlimited, no hard limit is enforced.
              Explicit requests for time limits smaller or equal to the hard
              limit are honored.  If no limit specifier is set, the value is
              assigned to the soft limit, and the hard limit is set to soft,
              to preserve the original behavior.

              The syntax for size limits is
              size[.{soft|hard|unchecked}]=<integer>, where integer is the
              maximum number of entries slapd will return answering a search
              request.  If no size limit is explicitly requested by the
              client, the soft limit is used; if the requested size limit
              exceeds the hard limit, the value of the limit is used
              instead.  If the hard limit is set to the keyword soft, the
              soft limit is used in either case; if it is set to the keyword
              unlimited, no hard limit is enforced.  Explicit requests for
              size limits smaller or equal to the hard limit are honored.
              The unchecked specifier sets a limit on the number of
              candidates a search request is allowed to examine.  The
              rationale behind it is that searches for non-properly indexed
              attributes may result in large sets of candidates, which must
              be examined by slapd(8) to determine whether they match the
              search filter or not.  The unchecked limit provides a means to
              drop such operations before they are even started.  If the
              selected candidates exceed the unchecked limit, the search
              will abort with Unwilling to perform.  If it is set to the
              keyword unlimited, no limit is applied (the default).  If it
              is set to disable, the search is not even performed; this can
              be used to disallow searches for a specific set of users.  If
              no limit specifier is set, the value is assigned to the soft
              limit, and the hard limit is set to soft, to preserve the
              original behavior.

              In case of no match, the global limits are used.  The default
              values are the same as for olcSizeLimit and olcTimeLimit; no
              limit is set on unchecked.

              If pagedResults control is requested, the hard size limit is
              used by default, because the request of a specific page size
              is considered an explicit request for a limitation on the
              number of entries to be returned.  However, the size limit
              applies to the total count of entries returned within the
              search, and not to a single page.  Additional size limits may
              be enforced; the syntax is
    {<integer>|noEstimate|unlimited}, where integer is the
              max page size if no explicit limit is set; the keyword
              noEstimate inhibits the server from returning an estimate of
              the total number of entries that might be returned (note: the
              current implementation does not return any estimate).  The
              keyword unlimited indicates that no limit is applied to the
              pagedResults control page size.  The syntax
              size.prtotal={<integer>|hard|unlimited|disabled} allows one to
              set a limit on the total number of entries that the
              pagedResults control will return.  By default it is set to the
              hard limit which will use the size.hard value.  When set,
              integer is the max number of entries that the whole search
              with pagedResults control can return.  Use unlimited to allow
              unlimited number of entries to be returned, e.g. to allow the
              use of the pagedResults control as a means to circumvent size
              limitations on regular searches; the keyword disabled disables
              the control, i.e. no paged results can be returned.  Note that
              the total number of entries returned when the pagedResults
              control is requested cannot exceed the hard size limit of
              regular searches unless extended by the prtotal switch.

       olcMaxDerefDepth: <depth>
              Specifies the maximum number of aliases to dereference when
              trying to resolve an entry, used to avoid infinite alias
              loops. The default is 15.

       olcMultiProvider: TRUE | FALSE
              This option puts a consumer database into Multi-Provider mode.
              Update operations will be accepted from any user, not just the
              updatedn.  The database must already be configured as syncrepl
              consumer before this keyword may be set.  This mode also
              requires a olcServerID (see above) to be configured.  By
              default, this setting is FALSE.

       olcPlugin: <plugin_type> <lib_path> <init_function> [<arguments>]
              Configure a SLAPI plugin. See the slapd.plugin(5) manpage for
              more details.

       olcRootDN: <dn>
              Specify the distinguished name that is not subject to access
              control or administrative limit restrictions for operations on
              this database.  This DN may or may not be associated with an
              entry.  An empty root DN (the default) specifies no root
              access is to be granted.  It is recommended that the rootdn
              only be specified when needed (such as when initially
              populating a database).  If the rootdn is within a
              namingContext (suffix) of the database, a simple bind password
              may also be provided using the olcRootPW directive. Note that
              the rootdn is always needed when using syncrepl.  The
              olcRootDN of the cn=config database defaults to cn=config

       olcRootPW: <password>
              Specify a password (or hash of the password) for the rootdn.
              The password can only be set if the rootdn is within the
              namingContext (suffix) of the database.  This option accepts
              all RFC 2307 userPassword formats known to the server (see
              olcPasswordHash description) as well as cleartext.
              slappasswd(8) may be used to generate a hash of a password.
              Cleartext and {CRYPT} passwords are not recommended.  If empty
              (the default), authentication of the root DN is by other means
              (e.g. SASL).  Use of SASL is encouraged.

       olcSubordinate: [TRUE | FALSE | advertise]
              Specify that the current backend database is a subordinate of
              another backend database. A subordinate  database may have
              only one suffix. This option may be used to glue multiple
              databases into a single namingContext.  If the suffix of the
              current database is within the namingContext of a superior
              database, searches against the superior database will be
              propagated to the subordinate as well. All of the databases
              associated with a single namingContext should have identical
              rootdns.  Behavior of other LDAP operations is unaffected by
              this setting. In particular, it is not possible to use moddn
              to move an entry from one subordinate to another subordinate
              within the namingContext.

              If the optional advertise flag is supplied, the naming context
              of this database is advertised in the root DSE. The default is
              to hide this database context, so that only the superior
              context is visible.

              If the slap tools slapcat(8), slapadd(8), or slapindex(8) are
              used on the superior database, any glued subordinates that
              support these tools are opened as well.

              Databases that are glued together should usually be configured
              with the same indices (assuming they support indexing), even
              for attributes that only exist in some of these databases. In
              general, all of the glued databases should be configured as
              similarly as possible, since the intent is to provide the
              appearance of a single directory.

              Note that the subordinate functionality is implemented
              internally by the glue overlay and as such its behavior will
              interact with other overlays in use. By default, the glue
              overlay is automatically configured as the last overlay on the
              superior database. Its position on the database can be
              explicitly configured by setting an overlay glue directive at
              the desired position. This explicit configuration is necessary
              e.g.  when using the syncprov overlay, which needs to follow
              glue in order to work over all of the glued databases. E.g.
                   dn: olcDatabase={1}mdb,cn=config
                   olcSuffix: dc=example,dc=com

                   dn: olcOverlay={0}glue,olcDatabase={1}mdb,cn=config

                   dn: olcOverlay={1}syncprov,olcDatabase={1}mdb,cn=config
       See the Overlays section below for more details.

       olcSuffix: <dn suffix>
              Specify the DN suffix of queries that will be passed to this
              backend database.  Multiple suffix lines can be given and at
              least one is required for each database definition.

              If the suffix of one database is "inside" that of another, the
              database with the inner suffix must come first in the
              configuration file.  You may also want to glue such databases
              together with the olcSubordinate attribute.

       olcSyncUseSubentry: TRUE | FALSE
              Store the syncrepl contextCSN in a subentry instead of the
              context entry of the database. The subentry's RDN will be
              "cn=ldapsync". The default is FALSE, meaning the contextCSN is
              stored in the context entry.

       olcSyncrepl: rid=<replica ID> provider=ldap[s]://<hostname>[:port]
              searchbase=<base DN> [type=refreshOnly|refreshAndPersist]
              [interval=dd:hh:mm:ss] [retry=[<retry interval> <# of
              retries>]+] [filter=<filter str>] [scope=sub|one|base|subord]
              [attrs=<attr list>] [exattrs=<attr list>] [attrsonly]
              [sizelimit=<limit>] [timelimit=<limit>]
              [schemachecking=on|off] [network-timeout=<seconds>]
              [timeout=<seconds>] [bindmethod=simple|sasl] [binddn=<dn>]
              [saslmech=<mech>] [authcid=<identity>] [authzid=<identity>]
              [credentials=<passwd>] [realm=<realm>] [secprops=<properties>]
              [keepalive=<idle>:<probes>:<interval>] [starttls=yes|critical]
              [tls_cert=<file>] [tls_key=<file>] [tls_cacert=<file>]
              [tls_cacertdir=<path>] [tls_reqcert=never|allow|try|demand]
              [tls_cipher_suite=<ciphers>] [tls_ecname=<names>]
              [tls_protocol_min=<major>[.<minor>]] [suffixmassage=<real DN>]
              [logbase=<base DN>] [logfilter=<filter str>]
              [syncdata=default|accesslog|changelog] [lazycommit]
              Specify the current database as a consumer which is kept up-
              to-date with the provider content by establishing the current
              slapd(8) as a replication consumer site running a syncrepl
              replication engine.  The consumer content is kept synchronized
              to the provider content using the LDAP Content Synchronization
              protocol. Refer to the "OpenLDAP Administrator's Guide" for
              detailed information on setting up a replicated slapd
              directory service using the syncrepl replication engine.

              rid identifies the current syncrepl directive within the
              replication consumer site.  It is a non-negative integer
              having no more than three decimal digits.

              provider specifies the replication provider site containing
              the provider content as an LDAP URI. If <port> is not given,
              the standard LDAP port number (389 or 636) is used.

              The content of the syncrepl consumer is defined using a search
              specification as its result set. The consumer slapd will send
              search requests to the provider slapd according to the search
              specification. The search specification includes searchbase,
              scope, filter, attrs, attrsonly, sizelimit, and timelimit
              parameters as in the normal search specification. The exattrs
              option may also be used to specify attributes that should be
              omitted from incoming entries.  The scope defaults to sub, the
              filter defaults to (objectclass=*), and there is no default
              searchbase. The attrs list defaults to "*,+" to return all
              user and operational attributes, and attrsonly and exattrs are
              unset by default.  The sizelimit and timelimit only accept
              "unlimited" and positive integers, and both default to
              "unlimited".  Note, however, that any provider-side limits for
              the replication identity will be enforced by the provider
              regardless of the limits requested by the LDAP Content
              Synchronization operation, much like for any other search

              The LDAP Content Synchronization protocol has two operation
              types.  In the refreshOnly operation, the next synchronization
              search operation is periodically rescheduled at an interval
              time (specified by interval parameter; 1 day by default) after
              each synchronization operation finishes.  In the
              refreshAndPersist operation, a synchronization search remains
              persistent in the provider slapd.  Further updates to the
              provider will generate searchResultEntry to the consumer slapd
              as the search responses to the persistent synchronization
              search. If the initial search fails due to an error, the next
              synchronization search operation is periodically rescheduled
              at an interval time (specified by interval parameter; 1 day by

              If an error occurs during replication, the consumer will
              attempt to reconnect according to the retry parameter which is
              a list of the <retry interval> and <# of retries> pairs.  For
              example, retry="60 10 300 3" lets the consumer retry every 60
              seconds for the first 10 times and then retry every 300
              seconds for the next 3 times before stop retrying. The `+' in
              <# of retries> means indefinite number of retries until

              The schema checking can be enforced at the LDAP Sync consumer
              site by turning on the schemachecking parameter. The default
              is off.

              The network-timeout parameter sets how long the consumer will
              wait to establish a network connection to the provider. Once a
              connection is established, the timeout parameter determines
              how long the consumer will wait for the initial Bind request
              to complete. The defaults for these parameters come from

              A bindmethod of simple requires the options binddn and
              credentials and should only be used when adequate security
              services (e.g. TLS or IPSEC) are in place.  A bindmethod of
              sasl requires the option saslmech.  Depending on the
              mechanism, an authentication identity and/or credentials can
              be specified using authcid and credentials.  The authzid
              parameter may be used to specify an authorization identity.
              Specific security properties (as with the sasl-secprops
              keyword above) for a SASL bind can be set with the secprops
              option. A non default SASL realm can be set with the realm
              option.  The provider, other than allow authentication of the
              syncrepl identity, should grant that identity appropriate
              access privileges to the data that is being replicated (access
              directive), and appropriate time and size limits (limits

              The keepalive parameter sets the values of idle, probes, and
              interval used to check whether a socket is alive; idle is the
              number of seconds a connection needs to remain idle before TCP
              starts sending keepalive probes; probes is the maximum number
              of keepalive probes TCP should send before dropping the
              connection; interval is interval in seconds between individual
              keepalive probes.  Only some systems support the customization
              of these values; the keepalive parameter is ignored otherwise,
              and system-wide settings are used.

              The starttls parameter specifies use of the StartTLS extended
              operation to establish a TLS session before Binding to the
              provider. If the critical argument is supplied, the session
              will be aborted if the StartTLS request fails. Otherwise the
              syncrepl session continues without TLS. The tls_reqcert
              setting defaults to "demand", the tls_reqsan setting defaults
              to "allow", and the other TLS settings default to the same as
              the main slapd TLS settings.

              The suffixmassage parameter allows the consumer to pull
              entries from a remote directory whose DN suffix differs from
              the local directory. The portion of the remote entries' DNs
              that matches the searchbase will be replaced with the
              suffixmassage DN.

              Rather than replicating whole entries, the consumer can query
              logs of data modifications. This mode of operation is referred
              to as delta syncrepl. In addition to the above parameters, the
              logbase and logfilter parameters must be set appropriately for
              the log that will be used. The syncdata parameter must be set
              to either "accesslog" if the log conforms to the
              slapo-accesslog(5) log format, or "changelog" if the log
              conforms to the obsolete changelog format. If the syncdata
              parameter is omitted or set to "default" then the log
              parameters are ignored.

              The lazycommit parameter tells the underlying database that it
              can store changes without performing a full flush after each
              change. This may improve performance for the consumer, while
              sacrificing safety or durability.

       olcUpdateDN: <dn>
              This option is only applicable in a replica database.  It
              specifies the DN permitted to update (subject to access
              controls) the replica.  It is only needed in certain push-mode
              replication scenarios.  Generally, this DN should not be the
              same as the rootdn used at the provider.

       olcUpdateRef: <url>
              Specify the referral to pass back when slapd(8) is asked to
              modify a replicated local database.  If multiple values are
              specified, each url is provided.


       Each database may allow specific configuration options; they are
       documented separately in the backends' manual pages. See the
       slapd.backends(5) manual page for an overview of available backends.

OVERLAYS         top

       An overlay is a piece of code that intercepts database operations in
       order to extend or change them. Overlays are pushed onto a stack over
       the database, and so they will execute in the reverse of the order in
       which they were configured and the database itself will receive
       control last of all.

       Overlays must be configured as child entries of a specific database.
       The entry's RDN must be of the form olcOverlay={x}<overlaytype> and
       the entry must have the olcOverlayConfig objectClass. Normally the
       config engine generates the "{x}" index in the RDN automatically, so
       it can be omitted when initially loading these entries.

       See the slapd.overlays(5) manual page for an overview of available

EXAMPLES         top

       Here is a short example of a configuration in LDIF suitable for use
       with slapadd(8) :

              dn: cn=config
              objectClass: olcGlobal
              cn: config
              olcPidFile: LOCALSTATEDIR/run/
              olcAttributeOptions: x-hidden lang-

              dn: cn=schema,cn=config
              objectClass: olcSchemaConfig
              cn: schema

              include: file://SYSCONFDIR/schema/core.ldif

              dn: olcDatabase=frontend,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcFrontendConfig
              olcDatabase: frontend
              # Subtypes of "name" (e.g. "cn" and "ou") with the
              # option ";x-hidden" can be searched for/compared,
              # but are not shown.  See slapd.access(5).
              olcAccess: to attrs=name;x-hidden by * =cs
              # Protect passwords.  See slapd.access(5).
              olcAccess: to attrs=userPassword  by * auth
              # Read access to other attributes and entries.
              olcAccess: to * by * read

              # set a rootpw for the config database so we can bind.
              # deny access to everyone else.
              dn: olcDatabase=config,cn=config
              objectClass: olcDatabaseConfig
              olcDatabase: config
              olcRootPW: {SSHA}XKYnrjvGT3wZFQrDD5040US592LxsdLy
              olcAccess: to * by * none

              dn: olcDatabase=mdb,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcMdbConfig
              olcDatabase: mdb
              olcSuffix: "dc=our-domain,dc=com"
              # The database directory MUST exist prior to
              # running slapd AND should only be accessible
              # by the slapd/tools. Mode 0700 recommended.
              olcDbDirectory: LOCALSTATEDIR/openldap-data
              # Indices to maintain
              olcDbIndex:     objectClass  eq
              olcDbIndex:     cn,sn,mail   pres,eq,approx,sub

              # We serve small clients that do not handle referrals,
              # so handle remote lookups on their behalf.
              dn: olcDatabase=ldap,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcLdapConfig
              olcDatabase: ldap
              olcSuffix: ""
              olcDbUri: ldap://

       Assuming the above data was saved in a file named "config.ldif" and
       the ETCDIR/slapd.d directory has been created, this command will
       initialize the configuration:
              slapadd -F ETCDIR/slapd.d -n 0 -l config.ldif

       "OpenLDAP Administrator's Guide" contains a longer annotated example
       of a slapd configuration.

       Alternatively, an existing slapd.conf file can be converted to the
       new format using slapd or any of the slap tools:
              slaptest -f ETCDIR/slapd.conf -F ETCDIR/slapd.d

FILES         top

              default slapd configuration file

              default slapd configuration directory

SEE ALSO         top

       ldap(3), ldif(5), gnutls-cli(1), slapd.access(5), slapd.backends(5),
       slapd.conf(5), slapd.overlays(5), slapd.plugin(5), slapd(8),
       slapacl(8), slapadd(8), slapauth(8), slapcat(8), slapdn(8),
       slapindex(8), slappasswd(8), slaptest(8).

       "OpenLDAP Administrator's Guide" (


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

COLOPHON         top

       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 ⟨⟩.  If you
       have a bug report for this manual page, see
       ⟨⟩.  This page was obtained from the
       project's upstream Git repository
       ⟨⟩ on 2020-09-18.  (At
       that time, the date of the most recent commit that was found in the
       repository was 2020-09-18.)  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

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