I would have my timer be duration-based instead of calandar based (assuming that fits your need)

You could use one of the following

OnActiveSec=48h (two days after the timer last triggered
OnUnitActiveSec=48h (two days afte the unit was last started)

Or slightly different

OnUnitInactiveSec=24h (one day after the service FINISHED)

In all those cases, since this is interval based, you would need a way to "prime the pump" I usually do this with

OnStartupSec=15m (1/4h after the machine was started)

or simply by enabling the service itself so it's part of the boot sequence (this will work with OnUnitActive and OnUnitInactive, but not with OnActive)

On 05/11/2018 09:36, Andy Pieters wrote:
Dear Systemd list

I have got a job that I want to execute every other day.

The job is rather lengthy and takes more than 24 hours to complete but
less than 48.

So here are my criteria:

Start today
Start the day after tomorrow (t+2d)*1
Start the (t+2d)*2
Start 2 days after that (t+2d)*n


My timer unit:

[Timer]
OnCalendar=*-*-01,03,05,07,09,11,13,15,17,19,21,23,25,27,29,31 03:30:00

The problem with that is when I simulate the execution dates,
specifically at newyear:

Tue 2018-12-25 03:30:00 CET
Thu 2018-12-27 03:30:00 CET
Sat 2018-12-29 03:30:00 CET
     Mon 2018-12-31 03:30:00 CET
     Tue 2019-01-01 03:30:00 CET
Thu 2019-01-03 03:30:00 CET
Sat 2019-01-05 03:30:00 CET
Mon 2019-01-07 03:30:00 CET
Wed 2019-01-09 03:30:00 CET

We can see that the timer would be triggered two days in a row.

What can we do about this, please? Is there a better way to define a
timer to run every other day? Can we perhaps add an exception for a
specific date?

Thank you kindly

Keep up the good work!



Andy
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