computer-playbook/roles/systemd-timer/README.md

Systemd Timer

Description

This role configures a systemd timer to periodically start a corresponding service. It uses a Jinja2 template to create a timer unit file that specifies the scheduling parameters (such as OnCalendar and RandomizedDelaySec) and then restarts the timer service accordingly.

Overview

Optimized for automated task scheduling in a systemd environment, this role:

• Generates a timer unit file for a given service (using the service_name variable).
• Reloads and restarts the timer using systemd to ensure that changes take effect.
• Supports dynamic configuration of scheduling parameters via variables like on_calendar and randomized_delay_sec.

Purpose

The primary purpose of this role is to provide a reusable mechanism for scheduling recurring tasks on a system. By creating and managing a systemd timer unit, the role ensures that specified services are automatically started at defined intervals, enhancing system automation and reliability.

Features

• Dynamic Timer Configuration: Uses a Jinja2 template to create a timer unit file based on provided variables.
• Automated Service Management: Automatically reloads the systemd daemon and restarts the timer when changes are detected.
• Flexible Scheduling: Supports configuration of parameters such as OnCalendar and RandomizedDelaySec for precise control over task timing.
• Persistent Timers: Optionally enables persistent timer behavior to ensure missed activations are handled.