Systemd Timers
Modern Linux timer units managed by systemd
What is Systemd Timers?
Systemd timers are the modern replacement for cron on Linux systems running systemd. Each timer consists of two unit files: a .timer file that defines the schedule and a .service file that defines what to execute. Timers support both calendar-based scheduling (like cron) and monotonic scheduling based on system uptime, boot time, or time since the last trigger.
Systemd timers integrate deeply with the rest of the systemd ecosystem. They benefit from journald logging, cgroup resource control, dependency management, and socket activation. You can use the AccuracySec directive to control wakeup coalescing for power efficiency, and Persistent=true to run missed jobs after a reboot — similar to anacron but with minute-level precision.
Best For
- Modern Linux servers and desktops already running systemd
- Jobs that need dependency ordering with other system services
- Environments requiring centralized logging via journald
- Tasks that benefit from cgroup-based resource limits (CPU, memory, I/O)
Limitations
- Only available on Linux systems running systemd — not macOS, BSD, or older Linux
- Requires creating two separate unit files per job, which is verbose
- No built-in web interface or remote management capability
- Monitoring requires additional tooling — systemd only logs to the journal
Systemd Timers vs CronJobPro
Systemd timers are powerful for local Linux scheduling and offer better logging and resource control than cron. However, they are limited to a single machine and require SSH access to manage. CronJobPro provides a web-based dashboard for managing schedules across any number of endpoints, with built-in monitoring, alerting, and retry logic that systemd timers lack without additional configuration.
Official Website
https://www.freedesktop.org/software/systemd/man/systemd.timer.htmlFrequently Asked Questions
What is Systemd Timers?
Systemd timers are the modern replacement for cron on Linux systems running systemd. Each timer consists of two unit files: a .timer file that defines the schedule and a .service file that defines what to execute. Timers support both calendar-based scheduling (like cron) and monotonic scheduling based on system uptime, boot time, or time since the last trigger.
What is Systemd Timers best for?
Modern Linux servers and desktops already running systemd. Jobs that need dependency ordering with other system services. Environments requiring centralized logging via journald. Tasks that benefit from cgroup-based resource limits (CPU, memory, I/O).
How does Systemd Timers compare to an external cron service?
Systemd timers are powerful for local Linux scheduling and offer better logging and resource control than cron. However, they are limited to a single machine and require SSH access to manage. CronJobPro provides a web-based dashboard for managing schedules across any number of endpoints, with built-in monitoring, alerting, and retry logic that systemd timers lack without additional configuration.
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