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Allow any user to shutdown my Linux server December 15, 2009

Posted by jbanju in LINUX CentOS.
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For example, allow user rocky to shutdown computer (first login as a root user):
$ su -
# visudo

Append following text to file:
rocky server.mydomain.com=/sbin/halt /sbin/reboot
Save file and exit to shell prompt. Now rocky can halt server by typing command:
$ sudo /sbin/halt
Output:

Password:

Please note that at password prompt rocky need to type his password.

Another way is to allow other users to shutdown server is to add them to /etc/shutdown.allow access control file. shutdown command can check to see if an
authorized user is logged in on one of the virtual consoles. If shutdown command is called with the -a argument , it checks to see if the file /etc/shutdown.allow is present. It then compares the login names in that file with the list of people that are logged in on a virtual console only if one of those authorized users or root is logged in, it will proceed. Otherwise, it will write the message

shutdown: no authorized users logged in

First login as a root user:
# touch /etc/shutdown.allow
# echo"username" >> /etc/shutdown.allow

On the other hand, use text editor such as vi to add username (Max 32 names are allowed):
# vi /etc/shutdown.allow
Shutdown computer using following command:
$ /sbin/shutdown -a -h 0

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