systemd Timer Generator
Interactively generate systemd .timer / .service unit files via GUI
How to Use
- Set the unit base name (e.g., backup) and unit type (system / user)
- Choose an OnCalendar preset or enter each field (weekday, year, month, day, hour, minute, second) and click "Add OnCalendar line" to build the execution schedule
- Configure monotonic timers (OnBootSec, etc.) and other timer options as needed
- Enter ExecStart (execution command), Type, user, and security settings on the service side
- Copy the generated .timer / .service files and place and enable them following the displayed installation guide
Use Cases
- When unfamiliar with cron and want to set up periodic execution while understanding each field's meaning
- When creating unit files while comprehensively reviewing systemd timer options
- When wanting to preview the next execution time of an OnCalendar expression beforehand
- When wanting to quickly generate service units with enhanced security (sandbox) settings
Frequently Asked Questions
What is an OnCalendar expression? ▼
It is a calendar expression used in systemd real-time timers. It follows the format "weekday year-month-day hour:minute:second", where each field supports list(,), range(..), repetition(/), and wildcard (*). You can also use shortcuts like minutely and daily.
Why are both .timer and .service needed? ▼
In systemd timer, the .timer file defines "when to run" and the .service file with the same name defines "what to run". Services started by timers typically use Type=oneshot.
Is the data I enter sent to a server? ▼
No, all processing is done entirely in the browser. The commands and settings you enter are never sent outside.
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