NIS+ is a directory service developed by Sun Microsystems to replace its older 'NIS' (Network Information Service). It is designed to eliminate the need for duplication across many computers of configuration data such as user accounts, host names and addresses, printer information and NFS disk mounts on individual systems, instead using a central repository on a master server, simplifying system administration. NIS+ client software has been ported to other Unix and Unix-like platforms.
Prior to the release of Solaris 9 in 2002, Sun announced its intent to remove NIS+ from Solaris in a future release and now recommends that customers instead use an LDAP-based lookup scheme. NIS+ was present in Solaris 9 and 10 (although both releases include tools to migrate NIS+ data to an LDAP server) and it has now been removed from the OpenSolaris trunk.
NIS vs. NIS+
NIS and NIS+ are only similar in their purpose and name; otherwise, they have completely different implementations. They differ in the following ways:
NIS+ is hierarchical.
NIS+ is based around Secure RPC (servers must authenticate clients and vice-versa).
NIS+ may be replicated (replicas are read-only).
NIS+ implements permissions on directories, tables, columns and rows.
NIS+ also implements permissions on operations, such as being able to use <tt>nisping</tt> to transfer changed data from a master to a replica.