Am Mon, 25 Sep 2017 22:45:23 -0700
schrieb Daniel Wang :
> I have a number of timers that all look something like the following:
>
> cat /etc/systemd/system/foo.timer
> [Unit]
> Description=Run foo every hour
>
> [Timer]
> OnCalendar=hourly
>
> cat /etc/systemd/system/bar.timer
> [Unit]
> Description=Run bar every minute
>
> [Timer]
> OnCalendar=minutely
>
> ... (this list goes on and on)
>
> The boilerplate for such small things is killing me. Is there a good
> technique to replace them with something simpler?
> Maybe transient timers? What will be the drawbacks of transient timers
> comparing to regular timers?
Make them into targets:
$ systemctl cat timer-{daily,hourly}.{target,timer}
# /etc/systemd/system/timer-daily.target
[Unit]
Description=Daily Timer Target
StopWhenUnneeded=yes
# /etc/systemd/system/timer-daily.timer
[Unit]
Description=Daily Timer
[Timer]
OnBootSec=10min
OnUnitActiveSec=1d
Unit=timer-daily.target
AccuracySec=12h
Persistent=yes
[Install]
WantedBy=timers.target
# /etc/systemd/system/timer-hourly.target
[Unit]
Description=Hourly Timer Target
StopWhenUnneeded=yes
# /etc/systemd/system/timer-hourly.timer
[Unit]
Description=Hourly Timer
[Timer]
OnBootSec=5min
OnUnitActiveSec=1h
Unit=timer-hourly.target
AccuracySec=30min
Persistent=yes
[Install]
WantedBy=timers.target
Then install your services into the target:
$ systemctl cat porticron.service
# /etc/systemd/system/porticron.service
[Unit]
Description=Check for upgrades and security updates
[Service]
Type=oneshot
IOSchedulingClass=idle
IOSchedulingPriority=7
CPUSchedulingPolicy=batch
Nice=7
ExecStart=/usr/sbin/porticron
[Install]
WantedBy=timer-daily.target
Enable timer targets:
$ systemctl enable timer-{daily,hourly}.timer
Created symlink /etc/systemd/system/timers.target.wants/timer-daily.timer →
/etc/systemd/system/timer-daily.timer.
Created symlink /etc/systemd/system/timers.target.wants/timer-hourly.timer →
/etc/systemd/system/timer-hourly.timer.
There's no need to enable the services then as they are triggered by
the timer targets:
$ systemctl list-timers
NEXT LEFTLAST
PASSEDUNIT ACTIVATES
Tue 2017-09-26 22:07:50 CEST 58min left Tue 2017-09-26 21:07:50 CEST
1min 29s ago timer-hourly.timer timer-hourly.target
Wed 2017-09-27 01:22:26 CEST 4h 13min left Tue 2017-09-26 01:16:59 CEST
19h ago timer-daily.timertimer-daily.target
As the targets are stopped when unneeded (thus each triggered service
stopped), they will be fired again next time. Just make sure your
triggered services actually stop: They should be Type=oneshot.
--
Regards,
Kai
Replies to list-only preferred.
___
systemd-devel mailing list
systemd-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/systemd-devel
