Use the following procedure for updating maps supplied with the default set.
Become a superuser on the master server.
Always modify NIS maps only on the master server.
Edit the source file for the map you want to change, whether that file resides in /etc or in some other directory of your choice.
Type the following.
# cd /var/yp # make mapname |
The make command then updates your map according to the changes you made in its corresponding file. It also propagates the changes among the other servers.