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is it possible to have a user account in Linux that can only login through its SSH public key?

I thought to simply do sudo passwd -l myuser and lock the account (so I don't need to generate some random and secure password) and allow to login only through SSH public key. Unfortunately this does not work (log says: User myuser not allowed because account is locked).

Thanks

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    If the password is unknown and you only allow public key auth, for all intents and purposes, you've created an account that can only log in with keys. – NickW Apr 8 '14 at 13:36
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Just generate a random string and pass it to the useradd command. If nothing else, useradd -p '*NP*' <userid> will do the trick.

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