The NIS network information service uses a distributed, replicated database of ndbm files (in ASCII form) contained in the /var/yp directory hierarchy on each NIS server. NIS is missing many key features that are desirable in a modern directory service. The Lightweight Directory Access Protocol (LDAP) is a preferred directory service. See ldap(1).
A ndbm database served by the NIS server is called an NIS map. An NIS domain is a subdirectory of /var/yp containing a set of NIS maps on each NIS server.
Standard nicknames are defined in the file /var/yp/nicknames. These names can be used in place of the full map name in the ypmatch and ypcat commands. The command ypcat -x can be used to display the current set of nicknames. The command ypwhich -m can be used to display all the available maps. Each line of the nickname file contains two fields separated by white space. The first field is the nickname and the second field is the name of the map that it expands to. The nickname cannot contain a ".".
Directory containing NIS configuration files.
Stores the information required to bind the NIS client to the NIS server.
Contains the servers to which the NIS client is allowed to bind.
Builds the NIS ndbm databases.
Defines the hosts and networks that are granted access to information in the served domain. This file is read at startup time by ypserv and ypxfrd.
Directory containing ndbm databases.
The NIS+ server, rpc.nisd, when run in "YP-compatibility mode", can support NIS clients only for the standard NIS maps listed below, provided that it has been set up to serve the corresponding NIS+ tables using nissetup(1M) and nisaddent(1M). The NIS+ server should serve the directory with the same name (case sensitive) as the domainname of the NIS client. NIS+ servers use secure RPC to verify client credentials but the NIS clients do not authenticate their requests using secure RPC. Therefore, NIS clients can look up the information stored by the NIS+ server only if the information has "read" access for an unauthenticated client (i.e. one with "nobody" NIS+ credentials).