SLAPD(8C)                                                            SLAPD(8C)

       slapd - Stand-alone LDAP Daemon

       /usr/lib/slapd [-4|-6] [-T {acl|a[dd]|auth|c[at]|
       d[n]|i[ndex]|p[asswd]|s[chema]|t[est]}] [-d debug-level] [-f slapd-
       config-file] [-F slapd-config-directory] [-h URLs] [-n service-name]
       [-s syslog-level] [-l syslog-local-user] [-o option[=value]]
       [-r directory] [-u user] [-g group] [-c cookie]

       Slapd is the stand-alone LDAP daemon. It listens for LDAP connections
       on any number of ports (default 389), responding to the LDAP operations
       it receives over these connections.  slapd is typically invoked at boot
       time, usually out of /etc/rc.local.  Upon startup, slapd normally forks
       and disassociates itself from the invoking tty.  If configured in the
       config file (or config directory), the slapd process will print its
       process ID (see getpid(2)) to a .pid file, as well as the command line
       options during invocation to an .args file (see slapd.conf(5)).  If the
       -d flag is given, even with a zero argument, slapd will not fork and
       disassociate from the invoking tty.

       See the "OpenLDAP Administrator's Guide" for more details on slapd.

       -4     Listen on IPv4 addresses only.

       -6     Listen on IPv6 addresses only.

       -T tool
              Run in Tool mode. The tool argument selects whether to run as
              slapadd, slapcat, slapdn, slapindex, slappasswd, slapschema, or
              slaptest (slapacl and slapauth need the entire acl and auth
              option value to be spelled out, as a is reserved to slapadd).
              This option should be the first option specified when it is
              used; any remaining options will be interpreted by the
              corresponding slap tool program, according to the respective man
              pages.  Note that these tool programs will usually be symbolic
              links to slapd.  This option is provided for situations where
              symbolic links are not provided or not usable.

       -d debug-level
              Turn on debugging as defined by debug-level.  If this option is
              specified, even with a zero argument, slapd will not fork or
              disassociate from the invoking terminal.  Some general operation
              and status messages are printed for any value of debug-level.
              debug-level is taken as a bit string, with each bit
              corresponding to a different kind of debugging information.  See
              <ldap_log.h> for details.  Comma-separated arrays of friendly
              names can be specified to select debugging output of the
              corresponding debugging information.  All the names recognized
              by the loglevel directive described in slapd.conf(5) are
              supported.  If debug-level is ?, a list of installed debug-
              levels is printed, and slapd exits.

              Remember that if you turn on packet logging, packets containing
              bind passwords will be output, so if you redirect the log to a
              logfile, that file should be read-protected.

       -s syslog-level
              This option tells slapd at what debug-level debugging statements
              should be logged to the syslog(8) facility.  The value syslog-
              level can be set to any value or combination allowed by the -d
              switch.  Slapd logs all messages selected by syslog-level at the
              syslog(3) severity debug-level DEBUG, on the unit specified with

       -n service-name
              Specifies the service name for logging and other purposes.
              Defaults to basename of argv[0], i.e.: "slapd".

       -l syslog-local-user
              Selects the local user of the syslog(8) facility. Value can be
              LOCAL0, through LOCAL7, as well as USER and DAEMON.  The default
              is LOCAL4.  However, this option is only permitted on systems
              that support local users with the syslog(8) facility.  Logging
              to syslog(8) occurs at the "DEBUG" severity debug-level.

       -f slapd-config-file
              Specifies the slapd configuration file. The default is

       -F slapd-config-directory
              Specifies the slapd configuration directory. The default is
              /etc/openldap/slapd.d.  If both -f and -F are specified, the
              config file will be read and converted to config directory
              format and written to the specified directory.  If neither
              option is specified, slapd will attempt to read the default
              config directory before trying to use the default config file.
              If a valid config directory exists then the default config file
              is ignored. All of the slap tools that use the config options
              observe this same behavior.

       -h URLlist
              slapd will by default serve ldap:/// (LDAP over TCP on all
              interfaces on default LDAP port).  That is, it will bind using
              INADDR_ANY and port 389.  The -h option may be used to specify
              LDAP (and other scheme) URLs to serve.  For example, if slapd is
              given -h "ldap:// ldaps:/// ldapi:///", it will
              listen on for LDAP, for LDAP over
              TLS, and LDAP over IPC (Unix domain sockets).  Host
              represents INADDR_ANY (any interface).  A space separated list
              of URLs is expected.  The URLs should be of the LDAP, LDAPS, or
              LDAPI schemes, and generally without a DN or other optional
              parameters (excepting as discussed below).  Support for the
              latter two schemes depends on selected configuration options.
              Hosts may be specified by name or IPv4 and IPv6 address formats.
              Ports, if specified, must be numeric.  The default ldap:// port
              is 389 and the default ldaps:// port is 636.

              For LDAP over IPC, name is the name of the socket, and no port
              is required, nor allowed; note that directory separators must be
              URL-encoded, like any other characters that are special to URLs;
              so the socket


              must be specified as


              The default location for the IPC socket is

              The listener permissions are indicated by "x-mod=-rwxrwxrwx",
              "x-mod=0777" or "x-mod=777", where any of the "rwx" can be "-"
              to suppress the related permission, while any of the "7" can be
              any legal octal digit, according to chmod(1).  The listeners can
              take advantage of the "x-mod" extension to apply rough
              limitations to operations, e.g. allow read operations ("r",
              which applies to search and compare), write operations ("w",
              which applies to add, delete, modify and modrdn), and execute
              operations ("x", which means bind is required).  "User"
              permissions apply to authenticated users, while "other" apply to
              anonymous users; "group" permissions are ignored.  For example,
              "ldap:///????x-mod=-rw-------" means that read and write is only
              allowed for authenticated connections, and bind is required for
              all operations.  This feature is experimental, and requires to
              be manually enabled at configure time.

       -r directory
              Specifies a directory to become the root directory.  slapd will
              change the current working directory to this directory and then
              chroot(2) to this directory.  This is done after opening
              listeners but before reading any configuration file or
              initializing any backend.  When used as a security mechanism, it
              should be used in conjunction with -u and -g options.

       -u user
              slapd will run slapd with the specified user name or id, and
              that user's supplementary group access list as set with
              initgroups(3).  The group ID is also changed to this user's gid,
              unless the -g option is used to override.  Note when used with
              -r, slapd will use the user database in the change root

              Note that on some systems, running as a non-privileged user will
              prevent passwd back-ends from accessing the encrypted passwords.
              Note also that any shell back-ends will run as the specified
              non-privileged user.

       -g group
              slapd will run with the specified group name or id.  Note when
              used with -r, slapd will use the group database in the change
              root environment.

       -c cookie
              This option provides a cookie for the syncrepl replication
              consumer.  The cookie is a comma separated list of name=value
              pairs.  Currently supported syncrepl cookie fields are rid, sid,
              and csn.  rid identifies a replication thread within the
              consumer server and is used to find the syncrepl specification
              in slapd.conf(5) or slapd-config(5) having the matching
              replication identifier in its definition. The rid must be
              provided in order for any other specified values to be used.
              sid is the server id in a multi-master/mirror-mode
              configuration.  csn is the commit sequence number received by a
              previous synchronization and represents the state of the
              consumer replica content which the syncrepl engine will
              synchronize to the current provider content.  In case of mirror-
              mode or multi-master replication agreement, multiple csn values,
              semicolon separated, can appear.  Use only the rid part to force
              a full reload.

       -o option[=value]
              This option provides a generic means to specify options without
              the need to reserve a separate letter for them.

              It supports the following options:

                     When SLP support is compiled into slapd, disable it
                      enable it by registering at SLP DAs without specific SLP
                     attributes (on), or with specific SLP attributes slp-
                     attrs that must be an SLP attribute list definition
                     according to the SLP standard.

                     For example, "slp=(tree=production),(server-
                     type=OpenLDAP),(server-version=2.4.15)" registers at SLP
                     DAs with the three SLP attributes tree, server-type and
                     server-version that have the values given above.  This
                     allows one to specifically query the SLP DAs for LDAP
                     servers holding the production tree in case multiple
                     trees are available.

       To start slapd and have it fork and detach from the terminal and start
       serving the LDAP databases defined in the default config file, just


       To start slapd with an alternate configuration file, and turn on
       voluminous debugging which will be printed on standard error, type:

            /usr/lib/slapd -f /var/tmp/slapd.conf -d 255

       To test whether the configuration file is correct or not, type:

            /usr/lib/slapd -Tt

       ldap(3), slapd.conf(5), slapd-config(5), slapd.access(5), slapacl(8),
       slapadd(8), slapauth(8), slapcat(8), slapdn(8), slapindex(8),
       slappasswd(8), slapschema(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.

OpenLDAP 2.4.48                   2019/07/24                         SLAPD(8C)