an introduction to ldap（3）.htm

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      <DIV id=cont_right style="WIDTH: 495px">LDAP servers can replicate either 
      some or all of their data via push or pull methods, allowing you to push 
      data to remote offices, to increase security, and so on. The replication 
      technology is built-in and easy to configure. By contrast, many of the big 
      DBMS vendors charge extra for this feature, and it's far more difficult to 
      manage. <BR><BR>LDAP allows you to securely delegate read and modification 
      authority based on your specific needs using ACIs (collectively, an ACL, 
      or Access Control List). For example, your facilities group might be given 
      access to change an employee's location, cube, or office number, but not 
      be allowed to modify entries for any other fields. ACIs can control access 
      depending on who is asking for the data, what data is being asked for, 
      where the data is stored, and other aspects of the record being modified. 
      This is all done through the LDAP directory directly, so you needn't worry 
      about making security checks at the user application level. <BR><BR>LDAP 
      is particularly useful for storing information that you wish to read from 
      many locations, but update infrequently. For example, your company could 
      store all of the following very efficiently in an LDAP directory: 
      <BR><BR>The company employee phone book and organizational chart 
      <BR><BR>External customer contact information <BR><BR>Infrastructure 
      services information, including NIS maps, email aliases, and so on 
      <BR><BR>Configuration information for distributed software packages 
      <BR><BR>Public certificates and security keys 
      <BR><BR><BR><BR>　LDAP服务器可以用"推"或"拉"的方法复制部分或全部数据，例如：可以把数据"推"到远程的办公室，以增加数据的安全性。复制技术是内置在LDAP服务器中的而且很容易配置。如果要在DBMS中使用相同的复制功能，数据库产商就会要你支付额外的费用，而且也很难管理。<BR><BR>　　LDAP允许你根据需要使用ACI（一般都称为ACL或者访问控制列表）控制对数据读和写的权限。例如，设备管理员可以有权改变员工的工作地点和办公室号码，但是不允许改变记录中其它的域。ACI可以根据谁访问数据、访问什么数据、数据存在什么地方以及其它对数据进行访问控制。因为这些都是由LDAP目录服务器完成的，所以不用担心在客户端的应用程序上是否要进行安全检查。 
      <BR><BR>　LDAP对于存储这样的信息最为有用，也就是数据需要从不同的地点读取，但是不需要经常更新。例如，这些信息存储在LDAP目录中是十分有效的：<BR><BR>公司员工的电话号码簿和组织结构图;客户的联系信息;计算机管理需要的信息，包括NIS映射、email假名，等等; 
      软件包的配置信息;公用证书和安全密匙.</DIV></TD></TR>
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      <DIV class=TitleInfoBox align=right>发表时间：2006-8-20 11:33:31　　　第1楼</DIV>
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