I was able to override it using /etc/systemd/system/apt-
daily.timer.d/override.conf with this config:
###
[Timer]
OnCalendar=
OnCalendar=*-*-* 02:00
RandomizedDelaySec=4h
AccuracySec=1m
Persistent=true
###
Which Means:
OnCalendar | Any day *-*-* at 02:00hrs. NOTE: See the first empty
OnCalendar, this was needed otherwise the time defined in here was added from
the previous schedule instead of replaced.
(https://github.com/systemd/systemd/issues/3233)
RandomizedDelaySec | Add a random delay of up to 4:00hrs [02:00-06:00]
AccuracySec | Start the process at any time within 1m of the calculated
time (oncalendar + randomizeddleaysec) this results in [02:00-06:01]
---
Default is:
###
[Timer]
OnCalendar=*-*-* 6,18:00
RandomizedDelaySec=12h
AccuracySec=1h
###
Which means:
OnCalendar | Any day *-*-* at 06:00hrs and 18:00hrs
RandomizedDelaySec | Add a random delay of up to 12:00hrs [06:00-18:00,
18:00-06:00] (NOTE: at this point it could be any time!)
AccuracySec | Start the process at any time within 1h of the calculated
time (oncalendar + randomizeddleaysec) this results in [06:00-19:00,
18:00-07:00]
---
Here I tested the overridden configuration:
# systemctl list-timers | grep -P "NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 05:46:11 CDT 17h left Thu 2017-04-20 11:42:55 CDT 3min 29s ago
apt-daily.timer apt-daily.service
# systemctl restart apt-daily.timer && systemctl list-timers | grep -P
"NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 02:58:14 CDT 15h left Thu 2017-04-20 11:42:55 CDT 3min 44s ago
apt-daily.timer apt-daily.service
# systemctl restart apt-daily.timer && systemctl list-timers | grep -P
"NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 04:05:12 CDT 16h left Thu 2017-04-20 11:42:55 CDT 3min 53s ago
apt-daily.timer apt-daily.service
# systemctl restart apt-daily.timer && systemctl list-timers | grep -P
"NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 05:44:41 CDT 17h left Thu 2017-04-20 11:42:55 CDT 4min 0s ago
apt-daily.timer apt-daily.service
# systemctl restart apt-daily.timer && systemctl list-timers | grep -P
"NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 03:05:18 CDT 15h left Thu 2017-04-20 11:42:55 CDT 4min 1s ago
apt-daily.timer apt-daily.service
# systemctl restart apt-daily.timer && systemctl list-timers | grep -P
"NEXT|apt"
NEXT LEFT LAST PASSED
UNIT ACTIVATES
Fri 2017-04-21 03:48:18 CDT 16h left Thu 2017-04-20 11:42:55 CDT 4min 4s ago
apt-daily.timer apt-daily.service
** Bug watch added: github.com/systemd/systemd/issues #3233
https://github.com/systemd/systemd/issues/3233
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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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