Nisplus
NISPLUS is the enhanced version of Network Information Service developed by Sun Micro System but NIS and NIS+ both are quite different in structure and organization . Though it is quite stable but people are preferring LDAP and Sun Micro System also plans to remove from its operating systems in favour of LDAP.
NISPLUS allows you to store client information at a central place where all the clients have access. The information can be user passwords , home directories, networks services etc .
The information is stored in NIS+ tables & some of the standard tables comes with predefined structure when NIS+ is installed. The other tables can be created as per requirement using NIS+ commands.
NIS+ uses hierarchical structure and can have multiple domains servers. It uses the client server model. The primary server is called master server and the backup server is called the replica server. Both server runs NIS+ and have copies of tables . The changes in master server are propagated to replica servers in increments.
For security it uses both authentication and authorization for securing the access to system and resources. Authentication verifies validity of a user ; Authorization verifies if the user is allowed to have access to the resources. Access to any NIS+ table can be controlled through the table permissions. Clients have a configuration file /etc/nsswitch.com ; entries in this file determines where the clients should look for the information , in local files or NIS+ maps at the server.
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