Temporarily Disable User logins
In case of any emergency maintenance activity, if you want to prevent users login to the server follow the steps.
This will not control root user login.
#touch /etc/nologin
#vi /etc/nologin
This system is down for maintenance.. No logins are permitted until 7.00 AM
When a normal user logs in, the message in the /etc/nologin will be
display and the login is rejected. Once maintenance window got
completed, you can remove the file or if you reboot the machine
automatically this file got deleted.
#rm /etc/nologin
Note:
This is common for Linux, Solaris and AIX. In Linux, ensure the line account required pam_nologin.so is added in the /etc/pam.d/ssh file
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