SIMA

System Init & Management Agent - A lightweight, modern init system written in Rust.

Designed to run as PID 1, SIMA manages system services with process isolation, graceful shutdown, and robust zombie reaping.

Website

Features

• PID 1 Init System - Runs as the system's init process
• Service Management - Start, monitor, and manage system services via YAML configuration
• Process Group Isolation - Each service runs in its own process group
• Async Runtime - Built on Tokio for efficient async I/O and signal handling
• Graceful Shutdown - Handles SIGTERM/SIGINT with configurable timeout and force kill fallback
• Zombie Reaping - Automatically reaps orphaned child processes
• Safe Rust - Written in 100% safe Rust with no unsafe code
• Structured Logging - Comprehensive logging with spdlog-rs

Configuration

SIMA loads a main manifest at /etc/sima.yml which references service definitions in /etc/sima.d/.

System Manifest (/etc/sima.yml)

services:
  - /etc/sima.d/example.yml
  - /etc/sima.d/another-service.yml

Service Definition (/etc/sima.d/example.yml)

name: example-service
description: Example service description
cmdline: /usr/bin/example-daemon