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Linux NIS / NIS+ Tutorial
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7.6. Shadow Passwords with NIS

Shadow passwords over NIS are always a bad idea. You loose the security, which shadow gives you, and it is supported by only some few Linux C Libraries. A good way to avoid shadow passwords over NIS is, to put only the local system users in /etc/shadow. Remove the NIS user entries from the shadow database, and put the password back in passwd. So you can use shadow for the root login, and normal passwd for NIS user. This has the advantage that it will work with every NIS client.

Linux NIS / NIS+ Tutorial
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