To change the NIS domain name of a machine, do the following.
Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Chapter 9, Using Role-Based Access Control (Tasks), in System Administration Guide: Security Services.
Edit the machine's /etc/defaultdomain file, exchanging its present contents with the new domain name for the machine.
For example, if the current domain name is sales.doc.com, you might change it to research.doc.com.
Run domainname `cat /etc/defaultdomain'
Re-initialize the machine as an NIS client, slave, or master server.
For the details, see Chapter 5, Setting Up and Configuring NIS Service.