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I have a mix of Debian and Ubuntu servers. I'll update manually anyway but for future cases, would unattended-upgrades set to security upgrades run daily be enough to stop this type of issue?
This is a kernel bug, unattended-upgrades will take care of installing the new kernel once the fix is published, but you still have to reboot to load it. I've set up a cron job that runs needrestart nightly and reboots my servers if there is a pending kernel upgrade [1]
Unattended-upgrades has a config option to auto reboot
Every time I see people boasting about their uptime, I ask myself how old their kernel actually is.
I've set this auto reboot and never had to worry about patching my server.
Edit: yeah I know live patching is a thing, not worth the hassle for 99% of server workloads.
True.
But by default the unattended-upgrades timer has a randomized trigger time (so that not all Debian machines in the world start hammering the mirrors at the same time). If you enable the auto reboot option in unattended-upgrades, your boxes will reboot at an unpredictable time. I prefer doing this at known times (middle of the night when I know nothing important is running/number of users is low).
You can set a time in the config file
Admittedly your cron job does the same thing but I like to have everything in one place