[CentOS] Reboot/shutdown without login

Mon Jan 11 19:37:56 UTC 2021
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On 1/11/21 1:24 PM, Stephen John Smoogen wrote:
> On Mon, 11 Jan 2021 at 14:14, Kenneth Porter <shiva at sewingwitch.com> wrote:
>> On 1/11/2021 10:32 AM, Frank Cox wrote:
>>> How do you want the person to shut it down without logging in?  Some
>> computers have a "smart" power switch pushbutton that you can program to do
>> a shutdown or a reboot depending on how long you hold the button down.
>> Otherwise you'll need at least a keyboard, or possibly something like a
>> joystick or a mouse button?
>> Keyboard. i don't have a mouse hooked up since it's currently running
>> without a GUI.
>> I wasn't sure if the power switch on the R720xd is monitored that way so
>> that hitting the front panel button would shut the system down or maybe
>> bring up the DRAC screen.
> The simplest would be to have a person plug in a keyboard and do a three
> finger salute (CNTRL-ALT-DEL) on the system. Doing it once should trigger a
> shutdown and reboot. [That said. I have seen some systems ignore it and
> others do an immediate power cycle so please test.]

(off topic)

In old times I always was disabling CNTRL-ALT-DEL, and adding to level 
"S" /usr/bin/login which effectively required password when one reboots 
machine into single user mode. And boot from anything but system drive 
was disabled in BIOS, and BIOS was password protected. Not that I 
disagree with "nothing can stop a guy with the screwdriver". But 
disabling easy way to tamper with the system adds to one's ability to 
notice the system had been tampered with (and when). Not doing it anymore...


> When the hardware is booted, the DRAC screen can only be brought up on the
> network.
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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247