I installed CentOS 8 on a Dell server and it's been running fine as a headless system, admin'd remotely by ssh. Now I'd like to allow someone to shut it down at the console without logging in. Is there a way to do that? Or do I need to get the GUI working?
I tried switching it into graphical mode ("systemctl isolate graphical") and the console freezes with nothing but a non-blinking text cursor at top left. The usual virtual console switching hotkeys (ctrl-alt F1-F7) don't do anything when it's hung like this. The system is still responsive in my ssh session. It doesn't recover if I switch back to multi-user target so I have to reboot it to make the console useful again. I'm guessing I'm lacking a good video driver. (It's an R720xd I inherited and the latest drivers on Dell's site are for RHEL 7.)
On Mon, 11 Jan 2021 10:23:04 -0800 Kenneth Porter wrote:
Now I'd like to allow someone to shut it down at the console without logging in.
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?
Use iDRAC: https://www.dell.com/support/kbdoc/en-us/000179517/dell-poweredge-how-to-con...
On 1/11/2021 12:32 PM, Frank Cox wrote:
On Mon, 11 Jan 2021 10:23:04 -0800 Kenneth Porter wrote:
Now I'd like to allow someone to shut it down at the console without logging in.
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?
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.
On Mon, 11 Jan 2021 at 14:14, Kenneth Porter shiva@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.]
When the hardware is booted, the DRAC screen can only be brought up on the network.
CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
On 1/11/21 1:24 PM, Stephen John Smoogen wrote:
On Mon, 11 Jan 2021 at 14:14, Kenneth Porter shiva@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...
Valeri
When the hardware is booted, the DRAC screen can only be brought up on the network.
CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
On 1/11/2021 11:37 AM, Valeri Galtsev wrote:
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...
That makes perfect sense in a company data room. My situation is a roommate that wants to power if off to sleep and I've left for an emergency and didn't have time to power it down myself.
Hello,
I had this problem on a Dell T7600 running CentOS 7.6 and 8.2.
The Dell does not have an embedded GPU so a PCIe one is used, typically Nvidia.
The standard CentOS Nvidia driver does not work on a Dell T7***.
You need to apply the Nvidia driver from their web site.
Below are the detailed instructions for CentOS 7.6
Installation of Dell T7600 CentOS 7.6 Nvidia GPU Driver
Make sure that the Dell T7600 is attached to a network.
Install OS if required: Boot USB CentOS 7.6 distribution Use arrow keys to position to 'Install CentOS 7' Enter <Tab> Use arrow keys to insert at the end of boot command line: <space>nouveau.modeset=0<cr> Build CentOS 7.6 making sure that the network is enabled during the configuration phase Reboot making sure that the USB CentOS 7.6 distribution is removed
Common procedure: At CentOS boot prompt enter <e> Use arrow keys to insert at end of line starting 'linux16': <space>nouveau.modeset=0 Enter <Ctrl+X> Log in, start a terminal window and become superuser Enter: yum -y update kernel-3.10.0-1160.11.1.el7.x86_64 Enter: cd /etc/default then edit the file grub Change: GRUB_DEFAULT=0 Append to GRUB_CMDLINE_LINUX before last ": <space>nouveau.modeset=0 Enter: grub2-mkconfig -o /boot/grub2/grub.cfg Enter: grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg Enter Browser and go to: www.nvidia.com/object/unix.html Download Nvidia Legacy Driver 390.138 and save * Reboot making sure the 1160.11 kernel is selected Log in, start a terminal window and become superuser Enter: yum -y groupinstall "Development Tools" Enter: yum -y install kernel-devel epel-release Enter: systemctl isolate multi-user.target Log in and become superuser Change directory to where the Nvidia driver was saved * Enter: sh NVIDIA-Linux-x86_64-* and answer Yes/Overwrite to everything Reboot making sure that the 1160.11 kernel is selected The procedure is now complete To check the driver is installed correctly: Log in, start a terminal window and become superuser Enter: lshw - numeric -C display The configuration line should have: driver=nvidia nvidia-settings can now be used to change display settings
Regards, Mark Woolfson
-----Original Message----- From: CentOS centos-bounces@centos.org On Behalf Of Kenneth Porter Sent: 11 January 2021 18:23 To: CentOS mailing list centos@centos.org Subject: [CentOS] Reboot/shutdown without login
I installed CentOS 8 on a Dell server and it's been running fine as a headless system, admin'd remotely by ssh. Now I'd like to allow someone to shut it down at the console without logging in. Is there a way to do that? Or do I need to get the GUI working?
I tried switching it into graphical mode ("systemctl isolate graphical") and the console freezes with nothing but a non-blinking text cursor at top left. The usual virtual console switching hotkeys (ctrl-alt F1-F7) don't do anything when it's hung like this. The system is still responsive in my ssh session. It doesn't recover if I switch back to multi-user target so I have to reboot it to make the console useful again. I'm guessing I'm lacking a good video driver. (It's an R720xd I inherited and the latest drivers on Dell's site are for RHEL 7.)
_______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
I installed CentOS 8 on a Dell server and it's been running fine as a headless system, admin'd remotely by ssh. Now I'd like to allow someone to shut it down at the console without logging in. Is there a way to do that? Or do I need to get the GUI working?
I tried switching it into graphical mode ("systemctl isolate graphical") and the console freezes with nothing but a non-blinking text cursor at top left. The usual virtual console switching hotkeys (ctrl-alt F1-F7) don't do anything when it's hung like this. The system is still responsive in my ssh session. It doesn't recover if I switch back to multi-user target so I have to reboot it to make the console useful again. I'm guessing I'm lacking a good video driver. (It's an R720xd I inherited and the latest drivers on Dell's site are for RHEL 7.)
You can configure a shutdown action for good old Ctrl-Alt-Del. That was usually configured for reboor so you can just change it to shutdown.
Simon
CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
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Christopher Wensink -
Frank Cox -
Kenneth Porter -
Mark Woolfson -
Simon Matter -
Stephen John Smoogen -
Strahil Nikolov -
Valeri Galtsev