🍎 Bulk Remote Shutdown — 100 macOS Endpoints via SSH

IT Automation | Remote Systems Management | macOS Administration
Replaced a 30-minute manual shutdown process with a single Bash script. Zero per-machine interaction.

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📋 Overview

A university computer lab (AULA01) operated 100 macOS machines across mixed OS versions (Sonoma, Monterey, Catalina). Shutting them down manually required a technician to interact with each machine individually — 20 to 30 minutes per session.

This project replaced that process entirely using parallel SSH execution from a single control machine inside the lab.

One command. 100 machines. Under 2 minutes.

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⚡ Quick Summary

Environment:  University lab — AULA01 (100 macOS endpoints)
OS versions:  Sonoma · Monterey · Catalina (mixed fleet)
Method:       Parallel SSH + sudo shutdown with 1-minute grace timer
Auth:         SSH key-based (no password prompt)
Result:       100 machines shut down simultaneously in < 2 minutes

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🗂️ Repository Contents

📄 README.md                          ← This file
📄 macos-bulk-shutdown-writeup.md     ← Full technical writeup

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🔧 The Script

#!/bin/bash

# AULA01 — Bulk Remote Shutdown (100 endpoints)
for i in $(seq 1 100); do
    IP="192.168.x.$i"
    ssh -o ConnectTimeout=4 ade@$IP "sudo shutdown -h +1" &
done

wait
echo "Shutdown command sent to all reachable endpoints in AULA01."

Parameter	Purpose
ConnectTimeout=4	Skip unreachable machines — no blocking
shutdown -h +1	1-minute grace period before shutdown
&	Parallel execution — all 100 machines simultaneously
wait	Wait for all background processes to finish

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🛡️ Security Considerations

This solution was designed for a controlled internal lab. The writeup includes a full analysis of the security tradeoffs made and recommended hardening steps for production environments.

👉 Read the full writeup

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📖 Who should read this

Audience	Why it matters
IT administrators	Lightweight bulk management without commercial tools
University / school IT teams	Direct applicability to lab environments
Security consultants	Documents real tradeoffs between automation and security
Recruiters	Real-world infrastructure automation at scale

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👤 Author

Alvaro Martinez | IT Infrastructure Specialist
Google Cybersecurity · Cisco CyberOps · ~10 years experience

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