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Introduction on Centralized Authentication Service

When you have a large user base using multiple services across the organization, a centralized authentication service becomes a need rather than a luxury. It becomes necessary to quickly add new user accounts across multiple services when a new user comes in, and deactivate the respective access tokens when a user leaves the organization. A centralized authentication service enables you to quickly respond by updating the user database on a single central server.

Various different services are available to set up centralized authentication. In this article, we will learn how to set up a centralized authentication service using a Lightweight Directory access Protocol (LDAP). A directory is a special database designed specifically for high volume lookups. LDAP directories are tree-based data structures, also known as Directory Information Trees (DIT). Each node in a tree contains a unique entry with its own set of attributes.

LDAP is specifically designed for high volume read systems with limited write activities. These directories are commonly used for storing details of users with their respective access control lists. Some examples include shared address books, shared calendar services, centralized authentication for systems such as Samba, and storage DNS systems. LDAP provides lightweight access to the directory services over the TCP/IP stack. It is similar to the X.500 OSI directory service, but with limited features and limited resource requirements. For more details on LDAP, check out the OpenLDAP admin guide at http://www.openldap.org/doc/admin24/intro.html .

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