Disable the system restart function by pressing Ctrl-Alt-Del in RHEL/CentOS 5/6

Disable the system restart function by pressing Ctrl-Alt-Del in RHEL/CentOS 5/6

In Linux, for security considerations, we allow anyone to press Ctrl-Alt-Del to restart the system. However, in the production environment, press Ctrl-Alt-Del to restart the system.

In this article, we will introduce how to disable the hotkey in RHEL and CentOS.

### Under RHEL 5.x and CentOS 5.x ###

Protect the init process from Ctrl-Alt-Del. Edit the line starting with 'Ca: ctrlaltdel: 'In'/etc/inittab 'as follows:

1. [Root @ localhost ~] # Cat/etc/inittab
2. # Trap CTRL-ALT-DELETE
3. # Ca: ctrlaltdel:/sbin/shutdown-t3-r now

We can also change the 'Ca: ctrlaltdel: 'line to output logs. If anyone wants to use this hotkey to restart the server, there will be logs,

1. [Root @ localhost ~] # Cat/etc/inittab
2. # Trap CTRL-ALT-DELETE
3. Ca: ctrlaltdel:/bin/logger-p authpriv. warning-t init "Console-invoked Ctrl-Alt-Del was ignored"

Under RHEL6.X and CentOS 6. X

In RHEL6.X and CentOS 6. X, the actions of the hotkey are controlled by '/etc/init/control-alt-delete.conf.

Step 1: Back up the configuration with the following command before the change

1. [Root @ localhost ~] # Cp-v/etc/init/control-alt-delete.conf/etc/init/control-alt-delete.override

Step 2 edit the file and replace the 'exec/sbin/shutdown 'line with the following configuration. This configuration will output the log every time you press Ctrl-Alt-Del:

1. [Root @ localhost ~] # Cat/etc/init/control-alt-delete.conf
2. Exec/usr/bin/logger-p authpriv. notice-t init "Ctrl-Alt-Del was pressed and ignored"

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