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Questions tagged [reboot]

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 bootmanager tag (e.g. [grub])

95
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4answers
271k 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?
7
votes
1answer
929 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 nice ...
50
votes
4answers
19k 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. ...
61
votes
7answers
302k 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 ...
31
votes
9answers
48k 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 ...
28
votes
1answer
11k 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 ...
7
votes
1answer
2k 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 ...
3
votes
2answers
3k views

What is the practical difference between `systemctl start reboot.target` and `systemctl reboot`?

There are two documented differences between start reboot.target and reboot. But start reboot.target is what is triggered by ctrl-alt-del.target. Does it matter that ctrl-alt-del.target will omit --...
45
votes
7answers
91k 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?
13
votes
3answers
12k 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] ...
11
votes
2answers
22k views

Reducing shutdown timeout for “a stop job is running”

I've got node.js and pm2 installed on a Pi (Raspbian). PM2 was configured to start via pm2 startup and the init scripts it creates. Sometimes when I reboot, shutdown hangs for a few minutes on: A ...
4
votes
1answer
823 views

Restart system if it runs out of memory?

I need to run some memory heavy tests in a remote computer through SSH. Last time I did this, the computer stopped responding, and it was necessary for someone to physically reboot it. Is there a way ...
5
votes
2answers
9k views

How to execute scripts in /usr/lib/systemd/system-shutdown/ at reboot or shutdown?

According to this answer and this bug report one can simply drop your script in /usr/lib/systemd/system-shutdown/ or for Debian in /lib/systemd/system-shutdown/ to have it executed at reboot or ...
4
votes
2answers
83 views

What forces a reboot?

I experience that my Ubuntu Linux requires a restart every now and then and also that it needs restart more often than in the old days (maybe it's because it updates more). I understand that ...
1
vote
1answer
1k views

Why `journalctl --list-boots` doesn't match what `uptime` and `who -b` report?

Here's a test script I used: last_reboot=$(last reboot | grep 'still running' | awk '{for (i=5; i<=NF; i++) printf $i FS}' | awk '{for (i=1; i<=NF - 2; i++) printf $i FS}') if [ "$last_reboot" ]...
63
votes
6answers
9k 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 ...
17
votes
1answer
22k 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 ...
7
votes
3answers
2k views

What is the meaning and command executed on Ctrl+Alt+Del in Linux?

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
1answer
2k 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+Del to reboot, Ctrl+Alt+Backspace to kill the X Window System nor Ctrl+Alt+F1 to open a new shell. I've read in ...
4
votes
4answers
3k views

Unable to SSH into Google Cloud Server after Reboot

I was learning to configure a Debian server and familiarising myself with the common command lines. However, after executing the reboot command in SSH, my subsequent SSH connections were refused and ...
6
votes
2answers
3k 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 ...
5
votes
1answer
1k views

Is the `reboot` command safe to use?

The reboot command appears to work differently depending on the distribution. For example on Ubuntu/Debian and CentOS it shuts down services first while on Arch Linux it reboots immediately (at least ...
4
votes
0answers
933 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 ...
3
votes
2answers
119 views

wget saving files as emply plain text files on boot

I have a bash script in crontab that runs @reboot: The script itself contains a wget command to pull and download a file from the internet When I run my script after signing in and opening the ...
3
votes
0answers
327 views

Limit system reboot burst

Systemd allows to automatically restart services if they have crashed. To prevent indefinite services restart it uses @StartLimitInterval@ and @StartLimitBurst@ variables. Moreover, I can reboot ...
2
votes
0answers
1k views

How does auto reboot happen?

For no apparent reason, my machine is rebooting. last reboot brings lines like this: reboot system boot 3.13.0-24-generi Tue Dec 9 18:57 - 19:09 (00:11) reboot system boot 3.13.0-24-...
2
votes
1answer
138 views

What is the necessity of the commands `halt --poweroff` , `halt --reboot`, `poweroff --reboot` and `reboot --poweroff`?

In UNIX the following commands are present: halt --poweroff //does poweroff halt --reboot //does reboot poweroff --reboot //does reboot reboot --poweroff //does poweroff However the ...
1
vote
1answer
60 views

How and when is the command string arg to reboot() with LINUX_REBOOT_CMD_RESTART2 executed?

The manpage of reboot() says LINUX_REBOOT_CMD_RESTART2 (0xa1b2c3d4; since Linux 2.1.30). The message "Restarting system with command '%s'" is printed, and a restart (using the command ...
0
votes
1answer
307 views

Why is FreeBSD rebooting during installation?

I have a samsung laptop which is around 1.5 years old. I am currently running arch linux and have run various linux distributions successfully in the past. The hardware is not obsolete and the ...
0
votes
1answer
832 views

How to umount /var /usr safely on systemd without reboot

I have a Linux server on a VM which the reboot does work as powering off due to misconfiguration of a third part provider. I do not have access to VM configuration. The person who installed the ...
0
votes
1answer
9k views

Find out what caused my Ubuntu rebooting?

My Ubuntu 14.04 on Thinkpad T400 just rebooted automatically. Before that, my screen just became unresponsive. My memory and swap were mostly used, mainly by webpages opened in Chrome and some pdf ...
-1
votes
2answers
75 views

How can I ssh into multiple password protected machines to reboot them?

I'm trying to write a bash script to reboot multiple machines via ssh that are all password protected. I have all the IPs listed in a .txt file and want the script to read the IPs from there. I've ...
-4
votes
1answer
376 views

VMWare error with Kali Linux

I have installed Kali Linux 2017.1 x64 in VMware Workstation Pro 12.5.6 along with the VMware tools (Is that the culprit?). My host is Windows 10 Creators Update 1703 build 15063.322 I have been ...