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Can anyone explain why my Ubuntu 18.04 server has rebooted every 28 days for last few months? I do not have unattended-upgrades configured to do so. I do have Canonical LivePatch, but this seems like the opposite of the behavior that that should cause. I've checked syslog around the time of the reboots and don't see anything untoward.

scojo5
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  • Is it a physical server, or VM? Is it in the cloud or something? If it isn't on physical hardware, is it something initiated by the hypervisor/cloud/etc? – Zoredache Nov 25 '19 at 23:37
  • Are there any cronjobs or other scheduled tasks that might be happening around that time, that might be crashing or something? – Zoredache Nov 25 '19 at 23:38
  • I once had a server like that. Turned out it was "protected" by an APC UPS that does a battery selftest every 4 weeks, and the batteries were completely worn out... The monitoring cable and/or software weren't installed so the battery problem couldn't be reported. – wurtel Nov 26 '19 at 07:49
  • It's a physical server @Zoredache. I haven't identified any such cron jobs; and it hasn't occurred at the exact same time on those days. – scojo5 Nov 26 '19 at 14:29
  • @wurtel I've also had that previously, where reboots would occur every 2 weeks with my current UPS. However, that would cause multiple attached servers to restart, but this is contained to one. – scojo5 Nov 26 '19 at 14:29

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