Ben Stienstra

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systemd_timers

Systemd timers, example

Lets say we want to start /home/heather/screenshot.sh every day at 23:58, with the parameter 4.

  • Create a service file /etc/systemd/system/HeatherScreenshot.service:
    [Unit]
    Description=HeatherScreenshot
    
    [Service]
    User=heather
    Type=simple
    ExecStart=/home/heather/screenshot.sh 4
  • Create a timer file /etc/systemd/system/HeatherScreenshot.timer:
    [Unit]
    Description=Runs HeatherScreenshot
    
    [Timer]
    # DayOfWeek Year-Month-Day Hour:Minute:Second
    OnCalendar=23:58:00
    Unit=HeatherScreenshot.service
    
    [Install]
    WantedBy=multi-user.target
  • Test run the static service:
    systemctl start HeatherScreenshot.service
  • Start and enable the timer:
    systemctl daemon-reload # if you modified the files
    systemctl start HeatherScreenshot.timer
    systemctl enable HeatherScreenshot.timer
  • Show timer status:
    systemctl list-timers --all
    NEXT                         LEFT          LAST                         PASSED       UNIT                         ACTIVATES
    Fri 2016-12-30 22:47:15 CET  4h 35min left Thu 2016-12-29 22:47:15 CET  19h ago      systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
    Sat 2016-12-31 00:00:00 CET  5h 47min left Fri 2016-12-30 00:00:05 CET  18h ago      logrotate.timer              logrotate.service
    Sat 2016-12-31 00:00:00 CET  5h 47min left Fri 2016-12-30 00:00:05 CET  18h ago      man-db.timer                 man-db.service
    Sat 2016-12-31 00:00:00 CET  5h 47min left Fri 2016-12-30 00:00:05 CET  18h ago      shadow.timer                 shadow.service
    Sat 2016-12-31 00:59:55 CET  6h left       Fri 2016-12-30 12:27:32 CET  5h 44min ago HeatherScreenshot.timer      HeatherScreenshot.service
    
    5 timers listed.
  • To disable a timer, first stop and than disable it:
    systemctl stop HeatherScreenshot.timer
    systemctl disable HeatherScreenshot.timer
systemd_timers.txt · Last modified: 2017/01/01 09:10 by admin