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Disable reboot using Ctrl-Alt-Del Keys in RHEL / CentOS
In Linux , It's a security concern for us to allow anyone to reboot the server using Ctrl-Alt-Del keys. It is always recommended in production boxes that one should disable reboot uisng Ctrl-Alt-Del keys.
In this article we will discuss how can we disable reboot via above keys in RHEL & CentOS
For RHEL 5.X & CentOS 5.X
To prevent the init process from handling Ctrl-Alt-Del, edit the file '/etc/inittab' comment the line which begins with 'ca::ctrlaltdel:' as shown below :
[root@localhost ~]# cat /etc/inittab
# Trap CTRL-ALT-DELETE
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now
We can also modify the line 'ca::ctrlaltdel:' to generate logs , if anybody try to reboot the server using the keys ,
[root@localhost ~]# cat /etc/inittab
# Trap CTRL-ALT-DELETE
ca::ctrlaltdel:/bin/logger -p authpriv.warning -t init "Console-invoked Ctrl-Alt-Del was ignored"
For RHEL6.X & CentOS 6.X
In RHEL 6.X / CentOS 6.X , reboot using the keys are handled by the file '/etc/init/control-alt-delete.conf'.
Step:1 Before making the changes , first take the backup using below command
[root@localhost ~]# cp -v /etc/init/control-alt-delete.conf /etc/init/control-alt-delete.override
Step:2 Edit the file , replacing the 'exec /sbin/shutdown' line with the following, which will simply generate a log entry each time Ctrl-Alt-Del is pressed:
[root@localhost ~]# cat /etc/init/control-alt-delete.conf
exec /usr/bin/logger -p authpriv.notice -t init "Ctrl-Alt-Del was pressed and ignored"
via: http://www.linuxtechi.com/disable-reboot-using-ctrl-alt-del-keys/
作者：Pradeep Kumar 译者：译者ID 校对：校对者ID