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How to Monitor Python Cron Jobs with CronRabbit

Python

The Problem

Python cron jobs can fail silently — exceptions get swallowed, scripts hang, or the process crashes before completion. Without monitoring, you may not discover the failure for hours or days.

The Solution

Add a simple HTTP ping at the end of your Python script. CronRabbit expects this ping on schedule and alerts you instantly if it doesn't arrive.

Why Monitor Python Cron Jobs?

Python scripts run by cron are fire-and-forget. If a script throws an unhandled exception, runs out of memory, or the Python interpreter crashes, cron won't retry or notify you. CronRabbit acts as a dead man's switch — if your script doesn't check in on time, you get alerted via Slack, Discord, Email, or Pushover.

Step 1: Create a Monitor

Sign up for CronRabbit and create a new monitor. Set the schedule to match your crontab entry (e.g. 0 2 * * * for daily at 2 AM). Configure a grace period to allow for normal execution variance.

Step 2: Add the Ping to Your Script

Add a single HTTP request at the end of your script. Use the requests library or urllib from the standard library. Place the ping after all critical logic so it only fires on success.

Step 3: Handle Failures Explicitly

Wrap your logic in try/except and send a /fail signal if something goes wrong. This triggers an immediate alert rather than waiting for the timeout.

Code Examples

Basic heartbeat ping

Python
import requests

PING_URL = "https://ping.cronrabbit.com/your-monitor-id"

def main():
    # Your job logic
    process_data()
    
    # Signal success
    requests.get(PING_URL, timeout=10)

if __name__ == "__main__":
    main()

With duration tracking and error handling

Python
import requests

PING_URL = "https://ping.cronrabbit.com/your-monitor-id"

def main():
    requests.get(f"{PING_URL}/start", timeout=10)
    try:
        run_backup()
        requests.get(PING_URL, timeout=10)
    except Exception:
        requests.get(f"{PING_URL}/fail", timeout=10)
        raise

if __name__ == "__main__":
    main()

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