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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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As per systemctl(1) manual:
If --force is specified twice, the operation is immediately executed without terminating any processes or unmounting any file systems. This may result in data loss. Note that when --force is specified twice the halt operation is executed by systemctl itself, and the system manager is not contacted. This means the command should succeed even when the system manager has crashed.
Ah, the --no-preserve-root flag equivalent for a reboot 😄
Good old --no-preserve-root 😅
Sounds like the equivalent of Alt+SysRq+B.
I'd never use it on a production server due to the implications of data loss associated with such a command.
You could say this is the same as sysreq trigger b where everything is ignored and just reboot with ignorance.
You can force the kernel to terminate all processes and amount all filesystems
This is very valid but in our case we dont really store any important data on the computer. We make digital timetable signs for bus stops and train stations, the computers we build and put inside are just a base image we flash onto the disk and set hostname and IP on. Then they all connect and set themselves up via our servers and pull any displayed data from our actual main servers.
In this case its sad that it didnt actually restart, that means our client has to drive out and deassemble the entire sign. But it seems to be a failing disk so it had to be replaced either way.
As long as it's not writing to disks, you're probably safe. This is a good method to avoid getting a remote device stuck too.
Obligatory "systemd was a mistake, they played us for absolute fools, yadda yadda yadda"
So hexbear now hates systemd. Good to know
I hate ycombinator but here:
Instead of just linking to the information, which may be removed in the future, you could have also pasted a snippet of a relevant section. Like:
If --force is specified twice, the operation is immediately executed without terminating any processes or unmounting any file systems. This may result in data loss. Note that when --force is specified twice the halt operation is executed by systemctl itself, and the system manager is not contacted. This means the command should succeed even when the system manager has crashed.