Each new domain will, of course, have its own master server. Each map is constructed from a standard text file by associating an index key with a value . An NIS record has a maximum size of 1024 bytes. For example, a list of users in a group can contain a maximum of 1024 characters in single-byte character set file format. The most commonly used maps have nicknames that some commands can translate into map names.
Clients use the ypservers map to find the nearest available server.
And the master server refers to it to determine the names of the slave servers that need to obtain updated copies of the NIS maps. Rather, it is strictly an NIS file that resides on the master server. NIS provides these maps for authentication purposes during execution of login, remote login, remote mount, and remote shell processes. Specifically, the programs that consult these maps are the login command, the rlogin command, the mountd daemon, and the rsh command. The makedbm Command NIS maps are created by the makedbm command, converting text files into DBM format files.