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14.3. OpenLDAP Daemons and Utilities

The suite of OpenLDAP libraries and tools are included within the following packages:
There are two servers contained in the openldap-servers package: the Standalone LDAP Daemon (/usr/sbin/slapd) and the Standalone LDAP Update Replication Daemon (/usr/sbin/slurpd).
The slapd daemon is the standalone LDAP server while the slurpd daemon is used to synchronize changes from one LDAP server to other LDAP servers on the network. The slurpd daemon is only used when dealing with multiple LDAP servers.
To perform administrative tasks, the openldap-servers package installs the following utilities into the /usr/sbin/ directory:


You must stop slapd by issuing the /sbin/service ldap stop command before using slapadd, slapcat or slapindex. Otherwise, the integrity of the LDAP directory is at risk.
For more information on using these utilities, refer to their respective man pages.
The openldap-clients package installs tools into /usr/bin/ which are used to add, modify, and delete entries in an LDAP directory. These tools include the following:
With the exception of ldapsearch, each of these utilities is more easily used by referencing a file containing the changes to be made rather than typing a command for each entry to be changed within an LDAP directory. The format of such a file is outlined in the man page for each utility.

14.3.1. NSS, PAM, and LDAP

In addition to the OpenLDAP packages, Fedora includes a package called nss_ldap, which enhances LDAP's ability to integrate into both Linux and other UNIX environments.
The nss_ldap package provides the following modules (where <version> refers to the version of libnss_ldap in use):
  • /lib/libnss_ldap-<version>.so
  • /lib/security/
The nss_ldap package provides the following modules for 64-bit architectures:
  • /lib64/libnss_ldap-<version>.so
  • /lib64/security/
The libnss_ldap-<version>.so module allows applications to look up users, groups, hosts, and other information using an LDAP directory via the Nameservice Switch (NSS) interface of glibc. NSS allows applications to authenticate using LDAP in conjunction with the NIS name service and flat authentication files.
The pam_ldap module allows PAM-aware applications to authenticate users using information stored in an LDAP directory. PAM-aware applications include console login, POP and IMAP mail servers, and Samba. By deploying an LDAP server on a network, all of these applications can authenticate using the same user ID and password combination, greatly simplifying administration.
For more about configuring PAM, refer to and the PAM man pages.