A lightweight n8n automation to monitor Linux disk space and send ntfy alerts when a critical threshold is exceeded.

Nodes (high level): Manual Trigger → Exec df → Function (parse/format) → IF threshold → HTTP ntfy Alert + HTTP ntfy Report.

• Runs df -P -B1 --output=source,fstype,size,used,avail,pcent,target.
• Filters out virtual filesystems (tmpfs, devtmpfs, squashfs, overlay).
• Calculates free percentage and builds a compact Markdown table (GiB/TiB).
• Sends:
  • Report: a readable Markdown report to your ntfy topic.
  • Alert: when any mount’s free % is below a threshold (default in the Function node logic).

n8n-disk-check-glaciar-public/
├─ workflows/
│  └─ disk_check_FULL.json
├─ scripts/
│  └─ import.sh
├─ LICENSE
├─ .gitignore
└─ README.md

1. n8n → Workflows → Import from File.
2. Choose workflows/disk_check_FULL.json.
3. Open the workflow and update:
   • ntfy topic URL (use your own, e.g., https://ntfy.sh/<your-topic>).
   • (Optional) Replace Manual Trigger with a Cron node for your schedule.

# from repo root
./scripts/import.sh

• Threshold: In the Function node, change the comparison (example):
  overallLow = vols.some(v => v.freePct < <THRESHOLD>);
• Ignore list: Adjust tmpfs, devtmpfs, squashfs, overlay to your needs.
• Timezone: Set the workflow timezone to match your environment.
• ntfy topic: Replace https://ntfy.sh/<your-topic> with your topic or self‑hosted instance.

• The Exec node runs a shell command; deploy only on trusted n8n workers.
• If your ntfy server is private, add Authorization in the HTTP nodes.

Choose HTTPS or SSH.

HTTPS (use a Personal Access Token when prompted):

git init
git add .
git commit -m "feat: n8n disk check workflow with ntfy alerts"
git branch -M main
git remote add origin https://github.com/<your-username>/n8n-disk-check-glaciar.git
git push -u origin main

git init
git add .
git commit -m "feat: n8n disk check workflow with ntfy alerts"
git branch -M main
git remote add origin [email protected]:<your-username>/n8n-disk-check-glaciar.git
git push -u origin main

Built from the provided workflow JSON. See workflows/disk_check_FULL.json.