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       slapd-config - configuration backend to slapd




       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

       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 defined.

              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

              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 option.

       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

       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

              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).

       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 option.

       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

       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

       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 slapindex(8).

       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
              brackets, 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.

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

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

       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".  These IDs are
              required when using multimaster replication and each master must
              have  a  unique  ID.  Note that this requirement also applies to
              separate masters 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.  Example:

            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.

       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.


       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 OpenSSL.  Example:

              olcTLSCipherSuite: HIGH:MEDIUM:+SSLv2

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

                   openssl ciphers -v <cipher-suite-spec>

              To obtain the list of ciphers in GNUtls use:

                   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. This directive
              is not supported when using GNUtls.

       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 carefully.

       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. If  multiple  sets
              of  parameters  are  present  in  the  file, all of them will be
              processed.  Note  that  setting  this  option  may  also  enable
              Anonymous  Diffie-Hellman  key  exchanges in certain non-default
              cipher suites.  You should append "!ADH" to your  cipher  suites
              if  you  have  changed  them  from  the  default,  otherwise  no
              certificate exchanges or verification will be done.  When  using
              GNUtls  these  parameters  are always generated randomly so this
              directive is ignored.

       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

              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

       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 /usr/lib/ldap, which is  where
              the standard OpenLDAP install will place its modules.


       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>] [OBSOLETE]
              [SUP <oids>]  [{  ABSTRACT   |   STRUCTURAL   |   AUXILIARY   }]
              [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 used.


       Options  in  these  entries only apply to the configuration of a single
       type of backend. All backends may support this class of  options.   The
       entry  must  be named olcBackend=<databasetype>,cn=config and must have
       the olcBackendConfig objectClass.  <databasetype> should be one of bdb,
       config,  dnssrv,  hdb,  ldap,  ldif, meta, monitor, null, passwd, perl,
       relay, shell, or sql.  At present, no backend implements any options of
       this type.


       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  database.

              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 administrators.

       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.

       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 conditions.

       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  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 or as additional values.  See olcLimits for an explanation
              of the different flags.

       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  or  as  additional  values.   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.

       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>|unlimited|disabled}  allows  to  set   a
              limit on the total number of entries that a pagedResults control
              allows to return.  By default it is set to the hard limit.  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.

       olcMirrorMode: TRUE | FALSE
              This  option puts a replica database into "mirror" 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 itself.

       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

              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}bdb,cn=config
                   olcSuffix: dc=example,dc=com

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

                   dn: olcOverlay={1}syncprov,olcDatabase={1}bdb,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_ciphersuite=<ciphers>]         [tls_crlcheck=none|peer|all]
              [logbase=<base       DN>]        [logfilter=<filter        str>]
              Specify  the  current database as a replica which is kept up-to-
              date  with  the  master  content  by  establishing  the  current
              slapd(8)  as  a  replication  consumer  site  running a syncrepl
              replication engine.  The replica content is kept synchronized to
              the  master  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
              master  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 replica 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 operation.

              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  master  replica  will
              generate  searchResultEntry  to the consumer slapd as the search
              responses to the persistent synchronization search.

              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 success.

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

              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 directive).

              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"  and  the other TLS settings default to the same as
              the main slapd TLS settings.

              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.

       olcUpdateDN: <dn>
              This  option  is  only  applicable  in  a  slave  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 master.

       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.


       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


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

              dn: cn=config
              objectClass: olcGlobal
              cn: config
              olcPidFile: /var/run/

              olcAttributeOptions: x-hidden lang-
              dn: cn=schema,cn=config
              objectClass: olcSchemaConfig
              cn: schema

              include: /etc/ldap/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=bdb,cn=config
              objectClass: olcDatabaseConfig
              objectClass: olcBdbConfig
              olcDatabase: bdb
              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: /var/lib/ldap
              # 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
       /etc/ldap/slapd.d   directory  has  been  created,  this  command  will
       initialize the configuration:
              slapadd -F /etc/ldap/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 /etc/ldap/slapd.conf -F /etc/ldap/slapd.d


              default slapd configuration file

              default slapd configuration directory


       ldap(3), ldif(5),  slapd.access(5),  slapd.backends(5),  slapd.conf(5),
       slapd.overlays(5),    slapd.plugin(5),    slapd.replog(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
       University of Michigan LDAP 3.3 Release.