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[Acronym] for __N__ame __S__ervice __S__witch The NSS is a glibc mechanism for providing multiple methods of accessing common databases such as the password or hosts database. It is commonly used to provide an interface to both local /etc/passwd (and shadow) files, and a remote authentication mechanism such as [NIS] or [LDAP]. The databases available for configuration within the NSS are: * aliases: Mail aliases * ethers: Ethernet numbers, * group: Groups of users * hosts: Host names and numbers. * netgroup: Network wide list of host and users * networks: Network names and numbers * protocols: Network protocols * passwd: User passwords * rpc: Remote procedure call names and numbers, * services: Network services * shadow: Shadow user passwords Most of these databases are normally only configured for flatfile access: protocols and services, for example, look up only in /etc/protocols and /etc/services. You could serve these from LDAP, or from a DBM file, or from an SQL database, or so on. See http://www.delorie.com/gnu/docs/glibc/libc_591.html for more information on the glibc [NSS]
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NSS
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LdapSystemAdministrationReview
LDAPAuthentication