rebooting is the process of bringing down a system in a state where it will complete reinitialise, without removing power from the system. Use this tag for question related to problems with being able to reboot a system. For problems booting into a particular installed OS, use the appropriate ...

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6answers
5k views

Why does reboot and poweroff require root privileges? [duplicate]

To restart or shut off Linux from the terminal, one can use reboot and poweroff, respectively. However, both of these commands require root privileges. Why is this so? What security risk is posed by ...
54
votes
4answers
123k views

What is the difference between reboot , init 6 and shutdown -r now?

I just want to know difference between in reboot init 6 shutdown -r now and which is the safest and the best?
34
votes
4answers
8k views

Save entire process for continuation after reboot

I developed an algorithm for a fairly hard problem in mathematics which is likely to need several months to finish. As I have limited resources only, I started this on my Ubuntu 12.04 (x86) laptop. ...
23
votes
3answers
2k views

When is a reboot required?

Apart from upgrading the kernel, are there any changes to a Linux system that require a reboot? I know there are situations where a reboot makes things easier, but are there any that cannot be ...
23
votes
3answers
91k views

crontab's @reboot only works for root?

man 5 crontab is pretty clear on how to use crontab to run a script on boot: These special time specification "nicknames" are supported, which replace the 5 initial time and date fields, and ...
18
votes
1answer
5k views

Why are reboot, shutdown and poweroff symlinks to systemctl?

In Arch Linux, if I do ls -l in /sbin, I can see that reboot, shutdown and poweroff are all symlinks to /usr/bin/systemctl. But issuing reboot, shutdown and systemctl commands obviously does not all ...
17
votes
4answers
24k views

How long has my Linux system been running?

Is there a command I can type in a terminal that will tell me the last time a machine was rebooted?
17
votes
5answers
18k views

How can I tell GRUB I want to reboot into Windows—before I reboot?

I have a dual boot Linux/windows system set up, and frequently switch from one to the other. I was thinking if I could add a menu item in one of the menus to reboot directly into windows, without ...
11
votes
3answers
6k views

“system is going down for reboot now”

I am connected to a beagleboard via tty and I suddenly see this message : Broadcast message from root@arm (unknown) at 11:40 ... The system is going down for reboot NOW! [ 143.036193] ...
10
votes
4answers
1k views

How do I shutdown, reboot and logout the system from the command-line?

I would like to do that using the command-line, because sometimes my computer freezes and I need to force a shutdown (I know it's not good to the hardware). And: What is the difference between Halt ...
9
votes
2answers
2k views

Why does Fedora 20 request a restart after software updates?

I have a Fedora 20 installation in a VirtualBox virtual machine. Now it notifies me of "OS Updates", that "Includes performance, stability and security improvements for all users", and I have the ...
9
votes
1answer
651 views

Don't let users reboot while root's logged in

On my system users can reboot and shut down the system. From time to time I need to update software (or do anything else) and I don't want users to reboot/shutdown the system until I've finished. Is ...
8
votes
1answer
6k views

How to continue a script after it reboots the machine?

I'm writing a shell script in bash. At some point in the script, it detects that the machine needs to be rebooted before continuing. It issues: sudo reboot When the machine comes back up, there ...
6
votes
4answers
632 views

How to log off when the desktop freezes?

Today I had an unexpected software failure. As I am inexperienced, I only managed to switch to the console using CTRL + ALT + F1 and then reboot using reboot. How do I properly log off if the desktop ...
6
votes
1answer
311 views

How does gnome reboot without root privileges?

I am reading the book Linux kernel development, in chapter 5 "System Call Implementation" page 77 says For example, capable(CAP_SYS_NICE) checks whether the caller has the ability to modify ...
6
votes
1answer
1k views

Meaning and commands for Ctrl+Alt+Del

In my gnome GUI desktop of Ubuntu 12.04, Ctrl+Alt+Delete will log out instead of rebooting. But I was told that Switching to a text-based virtual console and pressing Ctrl+Alt+Delete will ...
6
votes
4answers
13k views

iptables rules not reloading on CentOS 6.x

I have one single ipset added to my iptables on a CentOS 6.x box and this rule is lost when the machine reboots. I've found this answer showing how to make a Ubuntu system reload the iptables rules ...
6
votes
1answer
861 views

How to have Linux wipe/randomize/sanitize RAM at shutdown?

For mysterious reasons I still double boot sometimes into Windows. My problem is that I fear that information may leak because the RAM memory is accessible to Windows. (the Linux partitions are ...
5
votes
1answer
1k views

how to reboot a frozen FreeBSD server from the serial console?

Linux has the "magic sysrq key" to reboot frozen machines remotely, and it works over the serial console, but what about FreeBSD? Is there a way to send a "control-alt-delete" to FreeBSD servers on ...
5
votes
2answers
4k views

Is it possible to execute a script as first at shutdown/reboot on Debian?

I am currently trying to register a script (located in the /etc/init.d) in a way that makes this script being executed as the first script/programm at shutdown/reboot (change to running level 0 or 6). ...
5
votes
1answer
7k views

How to restart Alsa/PulseAudio after using Jack

After I use Jack, the PulseAudio outputs and inputs are replaced by a dummy device. I've tried to kill PulseAudio and reload Alsa, but the only way I can use an Alsa-based application again is to ...
5
votes
2answers
2k views

How can I ensure only the root user have the right to halt/reboot the system?

CentOS Linux by default allows all users to have permission to "halt" & "reboot" the system by using the commands halt and reboot. How can I configure my system so that only the root user has the ...
4
votes
2answers
408 views

How to safely shutdown computer during boot sequence?

Due to a bug my computer has stopped in the middle of the boot sequence, just waiting. If I type anything, it prints stuff like ^[[B. I do not want to damage the files on the computer by pressing the ...
4
votes
1answer
732 views

Why isn't “REISUB” working on Debian?

I'm using Debian 'Jessie'. Sometimes my computer freezes, and then I can't use Ctrl+Alt+Supr to reboot, Ctrl+Alt+Backspace to kill the X Window System nor Ctrl+Alt+F1 to open a new shell. I've read ...
4
votes
1answer
2k views

When can one reboot from inside a chroot environment?

Sometimes when I chroot into some folder , I could use reboot to reset my box, but sometimes I can't. So I want to know why I could do that sometimes and why. UPDATE The chroot environment is ...
4
votes
1answer
9k views

Why does my systemd unit fail to run on server reboot?

I'm having troubles getting a systemd service unit file to run correctly when the server reboots. This server is a fresh CentOS 7.0.1406 install. I'm trying to set it up with multiple Apache httpd ...
4
votes
1answer
892 views

What is the use of “magic arguments” in Linux reboot system call?

As I was reading Linux source code, and more specifically the system calls code, I came across sys_reboot implementation: http://lxr.free-electrons.com/source/kernel/reboot.c#L199. 199 ...
4
votes
1answer
719 views

Why do SELinux policies require a system restart?

When changing SELinux policies, I've been reading that you're required to restart the system. What changes would require this? Are there certain policy changes that would not require a restart?
4
votes
2answers
1k views

Does setting the system time back impair logrotate operation?

I'm working on an embedded linux system where the root filesystem is mounted from an SDcard. Although many systems like this just mount /var/log on a ramdisk, I'd like to save the logs to the SDcard ...
4
votes
0answers
496 views

Fedora 20 freezes on reboot and poweroff

This freeze happens when I try to reboot, shutdown -r now, poweroff, shutdown -h now etc. One time it freezes on my desktop image, and the other time it freezes on the fedora logo. I am dual booting ...
4
votes
2answers
5k views

“A stop job is running…” on shutdown

Almost every time when I'm shutting down or rebooting the system I get the following message before the system actually shuts down: A stop job is running for Session 1 of user xy It waits for ...
3
votes
2answers
2k views

Is there a way to tell how many times my computer has rebooted in a 24 hour period?

I was doing a 24 hour code-a-thon and had to reboot numerous times and was wondering if there was a way to tell exactly how many the computer was rebooted or crashed.
3
votes
2answers
989 views

Automatically reboot, if no wifi connection for a certain time

It seems that my Raspberry Pi server loses wifi connection after a random time and is somehow not able to recover automatically. Usually a reboot done by hand resolves the problem. I would like to ...
3
votes
3answers
15k views

Restart all services without reboot

I do some group permission changes on the CentOS server, And then need restart all services. How can I restart all services safely without rebooting?
3
votes
7answers
2k views

Rebooting fails randomly

That is, the following command fails at times: $ sudo reboot The last message on terminal, after which the machine gets stuck, requiring a power cycle: Restarting system. I tried the following ...
3
votes
3answers
937 views

Do I need to stop processes like mysql or apache before “reboot”?

I have been wondering if issuing a reboot command safely stops running LAMP processes like MySQL or Apache?
3
votes
1answer
3k views

Apache boot without asking for passwd

So I'm maintaining a server which has a verified SSL certificate setup, however there is a password on the private key and so whenever apache is reboot, we get a message asking for the password. This ...
3
votes
2answers
547 views

Remote executing Magic Sys Rq

Is it possible to execute Magic SysRq keys on remote machine, using SSH? For example I'm trying to run like this: xdotool key Alt+Sys_Req+H But I do not see any help in console, also in ...
3
votes
2answers
5k views

Poweroff or Reboot as normal User

To run the command poweroff or reboot one needs to be super user. Is there anyway I can run this as a normal user? I just don't want to sudo and enter my password every time I reboot or power off.
3
votes
2answers
71 views

I want to reboot the system once a search had been done to see that no-one is logged in

I'm working on a user menu so that when a user logs in all they get is this menu; on this menu is a selection of reboot option. I want one of the options to be reboot the system if no one is logged ...
3
votes
1answer
501 views

Rolling your own init: How to shutdown/restart?

After reading this answer, I thought it would be funny to roll my own init on Python, so I wrote this in /init-python. #!/usr/bin/python3 import os import subprocess # Make / writable! ...
3
votes
2answers
2k views

GNOME license not accepted issue when system has been rebooted

GNOME Desktop has been installed on CentOS7 using sudo yum -y groups install "GNOME Desktop" and when startx is executed the desktop starts. However, when the system reboots the following issue ...
3
votes
1answer
2k views

Reboot when there is a hardware failure without physical access to machine?

I'm getting this error message whathever I do: $ sudo reboot bash: /usr/bin/sudo: Input/output error $ reboot bash: /sbin/reboot: Input/output error It's a hardware failure according to this ...
3
votes
1answer
2k views

How to check will my computer is going to reboot(or shutting down)?

When I send a reboot command(or shutdown) command to a Linux machine does it keeps that messages at somewhere and can I query it. I.e. I will send a reboot command and after that I will run another ...
3
votes
1answer
469 views

Crunchbang hibernate rebooted system?

I installed the latest stable 64bit Crunchbang backport. When I tried to hibernate it last night, it rebooted into the locked state - when I logged back in all my windows/apps were as they were again. ...
3
votes
1answer
54 views

Shutdown with keyboard press doesn't work

I have a Debian Jessie build, and I want to add keyboard shutdown. I've tried the following, without any success: Attempt 1 To /etc/inittab I added ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now ...
3
votes
1answer
114 views

Kernel update - reboot needed or not?

I just updated our AWS Linux Server (which uses yum) and a new kernel is installed: kernel-4.1.10-16.27.amzn1.x86_64. It didn't state anything about restarting. According to this answer here I ...
3
votes
1answer
227 views

How do I detect that my system has auto-rebooted after a kernel panic?

I'm using Linux in embedded systems, and want to configure the system to automatically reboot after a kernel panic. However, when the system comes back up, it's important for me to detect and log the ...
3
votes
3answers
425 views

Cursor freezes - keystrokes to release?

Occasionally the mouse cursor will freeze - I have to reboot. In Ubuntu is there a keystroke combination such as Ctrl+Alt+Del which would enable me to continue working without having to reboot?
3
votes
1answer
1k views

How to debug random reboots, with no kernel panic, of an embedded system?

I have two aValue RPC-10W1 embedded systems that reboots by themselves after 1-2 hours. Facts: The board will reboot within a time span of 1 to 2½ hours. The issue is present on two identical ...