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This should (must?) be done before anything else after the base installation.
It is quite simple:
bin/rsync.passwords
will synchronize the password files from "master" to all the slaves found in the /root/hostsup file.
The password files that get synchronized are:
/etc/passwd /etc/shadow /etc/group /etc/gshadow
Note that this implies any users with an account on master will be able to access any machine of the cluster.
It would be more secure to keep separate password files for synchronization purposes. This would be harder to maintain however.