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Before you configure machines as NIS servers or clients, you must plan the NIS domain. Some of the tasks you perform during this planning stage include:
A domain name can be up to 256 characters long. However, because your /var/yp directory may reside in an s5 file system, and the domain name you select may be longer than the 14-character limit that s5 imposes on filenames, the program ypinit makes a shortened domain name and stores it in the /var/yp/aliases file. The name of the database directory /var/yp/domainname will correspond to the shortened alias for the domain name.
Once you have chosen a domain name, make a list of network hosts that will give or receive NIS service within that domain.