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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, see section 29.14 Group Database. * hosts: Host names and numbers, see section 16.6.2.4 Host Names. * netgroup: Network wide list of host and users, see section 29.16 Netgroup Database. * networks: Network names and numbers, see section 16.13 Networks Database. * protocols: Network protocols, see section 16.6.6 Protocols Database. * passwd: User passwords, see section 29.13 User Database. * rpc: Remote procedure call names and numbers, * services: Network services, see section 16.6.4 The Services Database. * 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