Posted on Dec 29, 2020

Create Alarm Clocker Using Python And SystemD

#devops #systemd #python #slackbot

⚛️ 📄 🚀

Python For Fun

Make alarm clocker by using combine of systemD, python, and slackbot

Create SystemD service

The service will start along with your machine and running background process to check clocker

⚡ $ cat Clocker.service [Unit] Description=Polling check clocker alarm Requires=network.target After=multi-user.target [Service] Type=forking PIDFile=/var/run/clocker_polling.pid ExecStart=/opt/ops/clocker_polling.sh StandardOutput=/var/log/clocker-alarm.log StandardError=/var/log/clocker-alarm.error Restart=on-failure RestartSec=5s [Install] WantedBy=multi-user.target

Create wrapper script to start service

⚡ $ cat /opt/ops/clocker_polling.sh #!/bin/bash rm -f /var/run/clocker_polling.pid python3 /opt/ops/clocker.py & echo $! > /var/run/clocker_polling.pid ⚡ $ sudo chmod +x /opt/ops/clocker_polling.sh

Python script to run process

⚡ $ cat /opt/ops/clocker.py import os import requests import time from datetime import datetime import json class SlackWebHook: """ Send payload to slack """ def __init__(self): self.webhook_url = 'https://hooks.slack.com/services/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' self.footer_icon = 'https://cdn2.iconfinder.com/data/icons/construction-2-15/65/65-512.png' self.slack_id = 'UU1111UU' def send_slack(self, msg): """ Send alarm to slack """ color = '#750202' level = ':boom: ALERT :boom:' curr_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S') message = f"<@{self.slack_id}> {msg}" slack_payload = {"username": "Hurry-up", "attachments": [{"fallback": "Required plain-text summary of the attachment.", "pretext": level, "color": color, "text": message, "footer": curr_time, "footer_icon": self.footer_icon}]} requests.post(self.webhook_url, data=json.dumps(slack_payload), headers={'Content-Type': 'application/json'}) if __name__ == '__main__': while 1: now = datetime.now() if now.hour == 23 and now.minute == 3: slack = SlackWebHook() slack.send_slack("*Report to the boss now!!!*") time.sleep(5) else: time.sleep(15)

Start systemD service

⚡ $ sudo cp Clocker.service /lib/systemd/system/ ⚡ $ systemctl start Clocker.service ⚡ $ systemctl status Clocker.service ● Clocker.service - Polling check clocker alarm Loaded: loaded (/lib/systemd/system/Clocker.service; enabled; vendor preset: enabled) Active: active (running) since Sun 2020-12-27 22:04:31 +07; 57min ago Process: 99372 ExecStart=/opt/ops/clocker_polling.sh (code=exited, status=0/SUCCESS) Main PID: 99379 (python3) Tasks: 1 (limit: 18998) Memory: 16.9M CGroup: /system.slice/Clocker.service └─99379 python3 /opt/ops/clocker.py Dec 27 22:04:31 jackdao systemd[1]: Starting Polling check clocker alarm... Dec 27 22:04:31 jackdao systemd[1]: Started Polling check clocker alarm.