2010-10-25 11:27:14 
阿炯
The enterprise-class Open Source LDAP server for Linux. It is hardened by real-world use, is full-featured, supports multi-master replication, and already handles many of the largest LDAP deployments in the world. The 389 Directory Server can be downloaded for free and set up in less than an hour using the graphical console. 
Features
* Multi-Master Replication, to provide fault tolerance and high write performance
* Scalability: thousands of operations per second, tens of thousands of concurrent users, tens of millions of entries, hundreds of gigabytes of data
* The codebase has been developed and deployed continuously by the same team for more than a decade
* Extensive documentation, including helpful Installation and Deployment guides
* Active Directory user and group synchronization
* Secure authentication and transport (SSLv3, TLSv1, and SASL)
* Support for LDAPv3
* On-line, zero downtime, LDAP-based update of schema, configuration, management and in-tree Access Control Information (ACIs)
* Graphical console for all facets of user, group, and server management
是一个企业级的Linux目录服务器，采用Java编写而成。由Fedora社区提供支持；当然在red hat发布的版本中同样包含了此软件，不过名称为'Red Hat Directory Server'，红帽为其提供商业支持。
Centralized repository for your identity and user information
Red Hat Directory Server is an LDAP-based server that centralizes application settings, user profiles, group data, policies, and access control information into an operating system-independent, network-based registry. Forming the central repository for an Identity Management infrastructure, Red Hat Directory Server simplifies user management, eliminating data redundancy and automating data maintenance. It also improves security, by storing policies and access control information, Red Hat Directory Server creates a single authentication source across entire enterprise for both intranet and extranet applications.
最新版本：1.2
该版本修复了大量导致程序崩溃的问题以及一些未完成的补丁。