[systemd-devel] OnCalendar timer starts before the scheduled date has passed

[Alden Page]

You're right, I misunderstood the purpose the the Requires directive.
Thanks for pointing this out, I am seeing the expected behavior in my
script after removing it.

Alden

On Mon, Mar 4, 2019 at 1:43 PM Andrei Borzenkov <arvidjaar at gmail.com> wrote:

> 04.03.2019 21:19, Alden Page пишет:
> > Hi systemd team,
> >
> > I'm having some trouble understanding the behavior of a systemd timer
> I've
> > set up in systemd version 219. I have a task that I want to run once per
> > week on Sundays at 3:00am UTC. However, as soon as I do `systemctl start
> > my_timer.timer`, the task starts no matter what time it is. This is a
>
> That is what you told it to do.
>
> > problem for me, because that means that my timer starts every single
> time I
> > recreate my server's virtual machine. After the initial erroneously
> > scheduled job has completed successfully, the timer starts behaving
> > correctly and runs on Sundays at 3:00am UTC.
> >
> > Here is how I've set up my timers. This is an excerpt from the script I
> use
> > to bootstrap my VMs:
> >
> > # Schedule weekly ingest of new data
> > cat << EOF > /etc/systemd/system/ingest_upstream.service
> > [Unit]
> > Description=Load and index image data from upstream.
> > [Service]
> > ExecStart=/usr/bin/curl -XPOST localhost:8001/task -H "Content-Type:
> > application/json" -d '{"model": "image", "action": "INGEST_UPSTREAM"}'
> > EOF
> >
> > cat << EOF > /etc/systemd/system/ingest_upstream.timer
> > [Unit]
> > Description=Ingest data from upstream every Sunday at 8:00am EST (3:00am
> > UTC).
> > Requires=ingest_upstream.service
> >
>
> Requires means - when ingest_upstream.timer is started (activated) also
> start (activate) units listed here. Which is exactly what happens.
>
> > [Timer]
> > OnCalendar=Sun *-*-* 3:00:00
> > Unit=ingest_upstream.service
> >
> > [Install]
> > WantedBy=timers.target
> > EOF
> > systemctl start ingest_upstream.timer
> >
> > After `systemctl start`, shouldn't it wait until the next OnCalendar
> > interval has passed, particularly since `Persistent=...` is not set?
> >
>
> It (presumably ingest_upstream.timer) does wait; your service is not
> activated by timer but by basic systemd unit dependency.
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