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The amd program ( BSD's automounter ) is employed to mount the home list on a slave node as needed. The master node also provides NIS service supplying the password and group files to the cluster as well as the automounter map ( / etc / amd.home in this example ). Each slave node is an NIS slave which can only bind to the master node.

This permits a user to be added to the cluster by making an account on the master, and adding that user to the NIS map files. There is not any obligation the slave nodes have any user-specific info on them, so changing the membership of slave nodes in the cluster is easier.