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Disable users from loggin into the server, except the administrator

In cases where you have to disable the login to all users,except root, for example when you have to do a backup, you have to use (man nologin).

1) Edit the pam file for the service you want to control, in this example i modify ssh pam control file, located in /etc/pam.d/sshd

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2) Create the /etc/nologin file, just do "touch /etc/nologin"

This should disable the login from ssh. If you want to disable the login from terminal, modify the /etc/pam.d/login file.

3) To re-enable the login just remove /etc/nologin


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