man slapd (Administration système) - Stand-alone LDAP Daemon


slapd - Stand-alone LDAP Daemon


/usr/lib/slapd [-[4|6]] [-T (a|c|i|p)] [-d debug-level] [-f slapd-config-file] [-h URLs] [-n service-name] [-s syslog-level] [-l syslog-local-user] [-r directory] [-u user] [-g group] [-t] [-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 /etc/ldap/slapd.conf, 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.

Slapd can be configured to provide replicated service for a database with the help of slurpd, the standalone LDAP update replication daemon. See slurpd(8) for details.

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


Listen on IPv4 addresses only.
Listen on IPv6 addresses only.
-T (a|c|i|p)
Run in Tool mode. The additional argument selects whether to run as slapadd, slapcat, slapindex, or slappasswd. This option should be the first option specified when it is used. Any remaining options will be interpreted by the corresponding slap tool program. 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. The meaning is the same as for the loglevel configuration option documented in slapd.conf(5). 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 level debugging statements should be logged to the syslog(8) facility.
-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. Values can be LOCAL0, LOCAL1, and so on, up to LOCAL7. The default is LOCAL4. However, this option is only permitted on systems that support local users with the syslog(8) facility.
-f slapd-config-file
Specifies the slapd configuration file. The default is /etc/ldap/slapd.conf.
-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 bind for LDAP, for LDAP over TLS, and LDAP over IPC (Unix domain sockets). Host represents INADDR_ANY. 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. The socket permissions for LDAP over IPC 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 (note, however, that sockets only honor the "w" permission), while any of the "7" can be any legal octal digit, according to chmod(1). While LDAP over IPC requires write permissions on the socket to allow any operation, the other listeners can take advantage of the "x-mod" extension to apply rough limitations to users, 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 bound users, while "other" apply to anonymous users.
-r directory
Specifies a chroot "jail" directory. slapd will chdir(2) then chroot(2) to this directory after opening listeners but before reading any configuration file or initializing any backend.
-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.
-g group
slapd will run with the specified group name or id.

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.

slapd will read the configuration file (the default if none is given with the -f switch) and check its syntax, without opening any listener or database.
-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 csn, sid, and rid. 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. sid is the identity of the per-scope session log with which the provider server can process this syncrepl request to reduce synchronization traffic. rid identifies a replication thread within the consumer server and is used to find the syncrepl specification in slapd.conf(5) having the matching replication identifier in its definition.


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:

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

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

	/usr/lib/slapd -t


ldap(3), slapd.conf(5), slapd.access(5), slapadd(8), slapcat(8), slapindex(8), slappasswd(8), slurpd(8)

"OpenLDAP Administrator's Guide" (




OpenLDAP is developed and maintained by The OpenLDAP Project ( OpenLDAP is derived from University of Michigan LDAP 3.3 Release.