Deploying Your Bots

⏱️ Task Schedulers (Cron jobs)

If you have a script that needs to run exactly at 8:00 AM every day (like our News Email Digest), you use Cron. Cron is a time-based job scheduler built into Linux/Unix systems.

You open the crontab editor via terminal: crontab -e

# CRON SYNTAX: [Minute] [Hour] [Day of Month] [Month] [Day of Week] [Command]

# Run every day at 8:00 AM
0 8 * * * /usr/bin/python3 /home/user/bots/news_digest.py >> /home/user/logs/news.log 2>&1

# Run every 15 minutes (Great for price trackers!)
*/15 * * * * /usr/bin/python3 /home/user/bots/price_tracker.py

🧟‍♂️ Keeping Bots Alive (PM2)

Unlike scheduled scripts, Discord/Telegram bots must run 24/7. If they encounter an unhandled exception, they crash, and your bot goes offline. To prevent this, we use a process manager like PM2.

# Install PM2 (Requires Node.js installed on your server)
npm install -g pm2

# Start your Python bot with PM2
pm2 start my_discord_bot.py --interpreter python3 --name "CommunityBot"

# Check the status of your bots
pm2 status

# View real-time logs
pm2 logs CommunityBot

With PM2, if your bot crashes due to a network error, PM2 instantly restarts it. Furthermore, you can configure PM2 to start your bots automatically if the server itself reboots: pm2 startup.

⚠️ Handling Failures Gracefully

Even with PM2 restarting your bot, you should handle failures in code so the bot doesn't crash in the first place. The golden rule of deployment: Assume the network will fail.

import requests
from time import sleep
import logging

# Set up logging instead of 'print'
logging.basicConfig(filename='bot_errors.log', level=logging.ERROR)

def robust_fetch(url, retries=3):
    for attempt in range(retries):
        try:
            # Add a timeout! Infinite hangs will freeze your bot.
            response = requests.get(url, timeout=10)
            response.raise_for_status() # Raise error on 404/500
            return response.json()
            
        except requests.exceptions.RequestException as e:
            logging.error(f"Attempt {attempt + 1} failed: {e}")
            if attempt < retries - 1:
                sleep(5) # Backoff before retrying
            else:
                # Final failure
                send_developer_telegram_alert(f"FATAL ERROR: {url} is unreachable.")
                return None