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kevinveenbirkenbachandClaude Opus 5
c55f508e05
The cosmos generator linked a consumer to its provider only through an '<role>' in group_names reference or an explicit provides: name. A hard dependency has neither -- pinning the provider on unconditionally is exactly what removes the Jinja reference the generator was reading -- so web-svc-asset's bond to web-svc-file vanished from the diagram the moment it became binding. Match a service key against the provider's own primary key from the registry, in both directions. Services the role turns off drew a solid 1:1 edge, claiming a mandatory relationship for something that carries nothing at deploy time. They now render as a red 0..0 edge; edge merging gained a real precedence so a provider consumed through two keys stays live when only one is off. Named colour, not hex: a '#' opens an entity code in the mermaid lexer and turns the whole diagram into a parse error on GitHub. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
44 lines
2.5 KiB
Markdown
44 lines
2.5 KiB
Markdown
# Systemd Timer
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## Description
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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.
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## Overview
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Optimized for automated task scheduling in a [systemd](https://en.wikipedia.org/wiki/Systemd) environment, this role:
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- Generates a timer unit file for a given service (using the `system_service_timer_service` variable).
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- Reloads and restarts the timer using systemd to ensure that changes take effect.
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- Supports dynamic configuration of scheduling parameters via variables like `system_service_on_calendar` and `RANDOMIZED_DELAY_SEC`.
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## Cosmos
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The diagram places Systemd Timer in the Infinito.Nexus cosmos: the components it deploys (capabilities), the central services it consumes (dependencies), and its outward reach (federation and bridged external networks).
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```mermaid
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flowchart LR
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subgraph role [sys-timer 💻]
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svc_timer["timer"]
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end
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```
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Solid `1:1` edges are fixed relationships; dashed `0..1` edges are conditional (enabled only in matching deployments); red `0..0` edges are turned off in this role. Node markers show the role's deploy modes (💻 host, 🐳 compose, 🐝 swarm); ❌ marks a service that is explicitly turned off, and ⚙️ an Ansible role dependency declared in `meta/main.yml`.
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## Purpose
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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.
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## Features
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- **Dynamic Timer Configuration:** Uses a Jinja2 template to create a timer unit file based on provided variables.
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- **Automated Service Management:** Automatically reloads the systemd daemon and restarts the timer when changes are detected.
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- **Flexible Scheduling:** Supports configuration of parameters such as OnCalendar and RandomizedDelaySec for precise control over task timing.
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- **Persistent Timers:** Optionally enables persistent timer behavior to ensure missed activations are handled.
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## Credits
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Implemented by **[Kevin Veen-Birkenbach](https://www.veen.world)**.
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Part of the [Infinito.Nexus Project](https://s.infinito.nexus/code) and maintained by [Kevin Veen-Birkenbach](https://www.veen.world).
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Licensed under the [Infinito.Nexus Community License (Non-Commercial)](https://s.infinito.nexus/license).
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