slapd(8) — Linux manual page


SLAPD(8C)                                                          SLAPD(8C)

NAME         top

       slapd - Stand-alone LDAP Daemon

SYNOPSIS         top

       LIBEXECDIR/slapd [-V[V[V]] [-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]

DESCRIPTION         top

       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.

OPTIONS         top

              Print version info and proceed with startup.  If -VV is given,
              exit after providing version info. If -VVV is given,
              additionally provide information on static overlays and

       -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

       -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 -l.

       -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-

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

       -F slapd-config-directory
              Specifies the slapd configuration directory. The default is
              ETCDIR/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

       -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-provider configuration.  csn
              is the commit sequence number received by a previous
              synchronization and represents the state of the consumer
              content which the syncrepl engine will synchronize to the
              current provider content.  In case of multi-provider
              replication agreement, multiple csn values, semicolon
              separated, can appear.  Use only the rid part to force a full

       -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.

EXAMPLES         top

       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 type:


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

            LIBEXECDIR/slapd -f /var/tmp/slapd.conf -d 255

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

            LIBEXECDIR/slapd -Tt

SEE ALSO         top

       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" (

BUGS         top



       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 2020-11-01.  (At
       that time, the date of the most recent commit that was found in the
       repository was 2020-10-30.)  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 im‐
       provements to the information in this COLOPHON (which is not part of
       the original manual page), send a mail to

OpenLDAP LDVERSION               RELEASEDATE                       SLAPD(8C)

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