Yesterday, I was trying to debug why my server running Plex rebooted and wasn't able to figure it out. There are several new commands that I discovered, the best of which is called last.
This article was really useful.
who
who command prints which users are currently logged in:
$ who
maxking tty2 2020-04-30 22:17 (tty2)But, you can use it with -b to figure out the last reboot time:
$ who -b
system boot 2020-04-30 22:16
last
last command prints a bunch of useful information, including
- Time of last reboot,
last reboot - time of last shutdown
last shutdown - All the system restart/shutdown events and run level changes
last -x
It also has a bunch of useful flags like, --present which also prints which users were present at the time (I really liked this one!)
$ last -p 14:40 1 ↵
maxking tty2 tty2 Thu Apr 30 22:17 still logged in
reboot system boot 5.6.7-300.fc32.x Thu Apr 30 22:16 still running
useful logs
I also found this stackexchange answer with a lot of useful log files that have information related to reboots like Kernel messages, systemd-journal etc.