My attempt to restrict unattended reboots to times between 0 and 6 AM
wasn't successful. What I did is I created a /etc/systemd/system/apt-
daily.timer.d/override.conf with the following contents:
[Timer]
OnCalendar=*-*-* 00:00
RandomizedDelaySec=6h
unattended-upgrade ran and rebooted my server at 1:27 AM, at which point
journalctl shows
Nov 10 01:27:36 fridge systemd[1]: apt-daily.timer: Adding 4h 13min
49.738746s random time.
Nov 10 01:27:36 fridge systemd[1]: Started Daily apt activities.
which would lead me to expect another run at 6:40 AM (which is already
outside my desired hours, but okay, not too bad). Instead, what I got
was
Nov 10 01:29:02 fridge systemd[1]: apt-daily.timer: Adding 3h 12min
35.192149s random time.
and then
Nov 10 09:13:06 fridge systemd[1]: Starting Daily apt activities...
which rudely interrupted my morning Mutt session with another reboot.
Bug in systemd's timers?
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https://bugs.launchpad.net/bugs/1615482
Title:
apt-daily timer runs at random hours of the day
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