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|System Administration Guide: Naming and Directory Services (NIS+)|
It is possible to include and access password information in multiple repositories, such as files and nisplus. You can use the nsswitch.conf file to establish the lookup order for that information.
In an NIS+ environment, the passwd line of the nsswitch.conf file should list the repositories in the following order.
passwd: files nisplus
In an NIS environment, the passwd line of the nsswitch.conf file should list the repositories in the following order.
passwd: files nis
Maintaining multiple repositories for the same user is not recommended. By maintaining centralized password management in a single repository for each user, you reduce the possibilities of confusion and error. If you choose to maintain multiple repositories per user, update password information by using the passwd -r command.
passwd -r repository
If no repository is specified with the -r option, passwd updates the repositories listed in nsswitch.conf in reverse order.