They do need kernel updates, but there are ways around that. Windows servers need to be rebooted about as often as you would HAVE TO reboot a Windows desktop computer.
But, kernel upgrades require a reboot. You can live patch them and get away without rebooting for a long time.
Sadly, many morons don't do that.
kind of like some apps require a reboot to install
Yeah... Most everything can be restarted for the changes to take place, but if you restart the kernel that means rebooting. You can't do one without the other. So, if it's a new kernel that's installed it's not actually working without being restarted.
Life patching helps but can't do everything. At the end of the day, you can plan on rebooting a Linux server every three to four months - or possibly a year (up to 18 months) with the various live-patching solutions. Live patching basically modifies the runtime code on the fly. This adds overhead and complexity, so you'll still wanna reboot eventually.
Some folks never reboot. Not once. Last I knew, there was an AIX system that hadn't been rebooted fo like 20-something years.
a lot of servers are accessed 24/7 so you dont really want them down
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