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nologin(5) [freebsd man page]

NOLOGIN(5)						      BSD File Formats Manual							NOLOGIN(5)

NAME
nologin -- disallow logins DESCRIPTION
Programs such as login(1) disallow logins if the nologin file exists. The programs display the contents of nologin to the user if possible and interrupt the login sequence. This makes it simple to temporarily prevent incoming logins systemwide. To disable logins on a per-account basis, investigate nologin(8). SECURITY
The nologin file is ignored for user root by default. IMPLEMENTATION NOTES
The nologin feature is implemented through login.conf(5), which allows to change the pathname of the file and to extend the list of users exempt from temporary login restriction. PAM-aware programs can be selectively configured to respect nologin using the pam_nologin(8) module via pam.conf(5). The nologin file will be removed at system boot if it resides in /var/run and cleanvar_enable is set to ``YES'' in rc.conf(5), which is default. Therefore system reboot can effectively re-enable logins. FILES
/var/run/nologin default location of nologin SEE ALSO
login(1), login.conf(5), pam.conf(5), rc.conf(5), nologin(8), pam_nologin(8), shutdown(8) BSD
May 10, 2007 BSD

Check Out this Related Man Page

NOLOGIN(5)						      BSD File Formats Manual							NOLOGIN(5)

NAME
nologin -- file disallowing and containing reason for disallowing logins DESCRIPTION
The file /etc/nologin, if it exists, causes the login procedure, used by programs such as login(1), to terminate. The program may display the contents of /etc/nologin to the user before exiting. This file is a simple mechanism to temporarily prevent incoming logins. As such, the file /etc/nologin is created by shutdown(8) five min- utes before system shutdown, or immediately if shutdown is in less than five minutes. The file /etc/nologin is removed just before shutdown(8) exits. To disable logins on a per-account basis, see nologin(8). The file /etc/nologin has no affect on the login procedure for the root user. FILES
/etc/nologin The nologin file resides in /etc. EXAMPLES
NO LOGINS: System going down at 18:22 SEE ALSO
login(1), ftpd(8), nologin(8), rshd(8), shutdown(8), sshd(8) BSD
December 9, 2005 BSD

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