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nologin(8) [centos man page]

NOLOGIN(8)						    BSD System Manager's Manual 						NOLOGIN(8)

nologin -- politely refuse a login SYNOPSIS
nologin displays a message that an account is not available and exits non-zero. It is intended as a replacement shell field for accounts that have been disabled. If the file /etc/nologin.txt exists, nologin displays its contents to the user instead of the default message. SEE ALSO
login(1) HISTORY
The nologin command appeared in 4.4BSD. BSD
February 15, 1997 BSD

Check Out this Related Man Page

PAM_NOLOGIN(8)							 Linux-PAM Manual						    PAM_NOLOGIN(8)

pam_nologin - Prevent non-root users from login SYNOPSIS [file=/path/nologin] [successok] DESCRIPTION
pam_nologin is a PAM module that prevents users from logging into the system when /var/run/nologin or /etc/nologin exists. The contents of the file are displayed to the user. The pam_nologin module has no effect on the root user's ability to log in. OPTIONS
file=/path/nologin Use this file instead the default /var/run/nologin or /etc/nologin. successok Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE. MODULE TYPES PROVIDED
The auth and acct module types are provided. RETURN VALUES
PAM_AUTH_ERR The user is not root and /etc/nologin exists, so the user is not permitted to log in. PAM_BUF_ERR Memory buffer error. PAM_IGNORE This is the default return value. PAM_SUCCESS Success: either the user is root or the nologin file does not exist. PAM_USER_UNKNOWN User not known to the underlying authentication module. EXAMPLES
The suggested usage for /etc/pam.d/login is: auth required NOTES
In order to make this module effective, all login methods should be secured by it. It should be used as a required method listed before any sufficient methods in order to get standard Unix nologin semantics. Note, the use of successok module argument causes the module to return PAM_SUCCESS and as such would break such a configuration - failing sufficient modules would lead to a successful login because the nologin module succeeded. SEE ALSO
nologin(5), pam.conf(5), pam.d(5), pam(8) AUTHOR
pam_nologin was written by Michael K. Johnson <>. Linux-PAM Manual 09/19/2013 PAM_NOLOGIN(8)
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