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The Name Service Switch (NSS) is a facility in Unix-like operating systems that provides a variety of sources for common configuration databases and name resolution mechanisms. These sources include local operating system files (such as /etc/passwd, /etc/group, and /etc/hosts), the Domain Name System (DNS), the Network Information Service (NIS), and LDAP. ==== A system administrator usually configures the operating system's name services using the file /etc/nsswitch.conf. This lists databases (such as passwd, shadow and group) and one or more sources for obtaining that information. Examples for sources are ''files'' for local files, ''ldap'' for the Lightweight Directory Access Protocol, ''nis'' for the Network Information Service, ''nisplus'' for NIS+, and ''wins'' for Windows Internet Name Service. The nsswitch.conf file has line entries for each service consisting of a database name in the first field, terminated by a colon, and a list of possible source databases mechanisms in the second field. A typical file might look like:
The order of the services listed determines in which order NSS will attempt to use those services to resolve queries on the specified database. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Name Service Switch」の詳細全文を読む スポンサード リンク
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