Naming and Directory Services (DNS, NIS, and LDAP)

separated by commas. For example, to create a netgroup with three members, thenetgroup input file entry would be in the format: name ID, ID, ID. The member IDsin a netgroup input file entry are in the following format.([-|machine], [-|user], [domain])Where machine is a machine name, user is a user ID, and domain is the machine oruser’s NIS domain. The domain element is optional and should only be used to identifymachines or users in some other NIS domain. The machine and user element of eachmember’s entry are required, but a dash (-) is used to denote a null. There is nonecessary relationship between the machine and user elements in an entry.The following are two sample netgroup input file entries, each of which create anetgroup named admins composed of the users hauri and juanita who is in theremote domain sales and the machines altair and sirius.admins (altair, hauri), (sirius,juanita,sales)admins (altair,-), (sirius,-), (-,hauri), (-,juanita,sales)Various programs use the netgroup NIS maps for permission checking during login,remote mount, remote login, and remote shell creation. These programs includemountd, login, rlogin, and rsh. The login command consults the netgroup mapsfor user classifications if it encounters netgroup names in the passwd database. Themountd daemon consults the netgroup maps for machine classifications if itencounters netgroup names in the /etc/dfs/dfstab file. rlogin and rsh In fact,any program that uses the ruserok interface consults the netgroup maps for bothmachine and user classifications if they encounter netgroup names in the/etc/hosts.equiv or .rhosts files.If you add a new NIS user or machine to your network, be sure to add them toappropriate netgroups in the netgroup input file. Then use the make and yppushcommands to create the netgroup maps and push them to all of your NIS servers. Seenetgroup(4) for detailed information on using netgroups and netgroup input filesyntax.Working With NIS MapsThis section contains the following information:■ “Obtaining Map Information” on page 98■ “Changing a Map’s Master Server” on page 98■ “Modifying Configuration Files” on page 99■ “Modifying and Using the Makefile” on page 100Chapter 6 • Administering NIS (Tasks) 97