On package updates, how do you know when a reboot is required?

[akulbe]

Just like the title says. How can you tell?

I know that when a kernel gets updated, of course, but are there other situations where you should reboot, as well?

The context is this: I have a nested Proxmox cluster that I run the test version on, and there were some "pve*" packages that just got updated.

 

[Johannes S]

Run needrestart in a root shell on the proxmox node. If you don't want to do this manually: Setup a nagios compatible monitoring software like Icinga2, needrestart can be called with the parameter -p to act as nagios check plugin

 

[LnxBil]

Check if the file /run/reboot-required is there. It will get created by e.g. kernel updates, which require a reboot to activate. Everything else can be restarted while the OS is running.