Service Status Indicator (SSI) - Simplified Script-Driven Monitoring System
SSI is a standardized monitoring system that turns custom BASH scripts into a real-time status feed. It leverages systemd to schedule checks and streams the results to a centralized Status Board, providing a simple and unified visual overview of whatever matters to you.
The Concept
In practice, SSI empowers power-users and system administrators to monitor any metric, service, or external target using simple Bash scripts.
By adhering to a minimal output convention, your "Service Scripts" become part of a managed ecosystem. You write the logic; SSI handles the "plumbing"—capturing outcomes, transporting data, and notifying the end-user via the backend in real-time.
Core Components - The Three-Piece Puzzle
The SSI ecosystem is built on three core components working in harmony:
1. The Agent (The Worker)
Installed on any Linux system running systemd, the Agent is where your service scripts live and execute. It consists of two parts:
- The CLI: A tool to validate your scripts and automatically configure the
systemdService and Timer units required for execution. - The Daemon: A lightweight background process that collects standardized logs from your scripts as they run and streams them to the Backend.
2. The Backend (The Brain)
The Backend acts as the central communication hub. It receives real-time updates from various Agents and manages the distribution of that information. It ensures that the current status of every monitored service is always available and ready to be pushed to your display.
3. The Frontend (The Status Board)
The Frontend is the visual interface (client) for the system. It maintains a real-time communication channel with the Backend to provide a glanceable overview of your agents. Whether through a persistent connection or push notifications, it ensures you are the first to know when a status changes.
See Architecture for more details.