Monitoring Raspberry Pi CPU temp + memory + a docker volume size to influxdb series

rpi-monitoring.py

#!/usr/bin/env python3

import logging
import os
import sys
import time
import traceback
import influxdb


# logging setup
logging.basicConfig(format='%(asctime)s %(message)s', level=logging.ERROR)
# db setup
db = influxdb.InfluxDBClient(host="172.18.0.3", port=8086, database='mydb')


while True:
    # list of points to write in db
    points_l = list()
    
    # CPU temperature
    try:
        with open('/sys/class/thermal/thermal_zone0/temp', 'r') as f:
            cpu_temp = float(f.read()) / 1000
            points_l.append(dict(measurement='rpi', tags=dict(tag='cpu_temp'), fields=dict(value=cpu_temp)))
    except Exception:
        logging.error(traceback.format_exc())

    # memory usage
    try:
        m_total, m_used, m_free = map(float, os.popen('free -t -m').readlines()[-1].split()[1:])
        points_l.append(dict(measurement='rpi', tags=dict(tag='mem_total'), fields=dict(value=m_total)))
        points_l.append(dict(measurement='rpi', tags=dict(tag='mem_used'), fields=dict(value=m_used)))
        points_l.append(dict(measurement='rpi', tags=dict(tag='mem_free'), fields=dict(value=m_free)))
    except Exception:
        logging.error(traceback.format_exc())

    # db volume usage
    try:
        db_size = float(os.popen('sudo du -sm /var/lib/docker/volumes/influxdb-data/_data/data/mydb').readlines()[-1].split()[0])
        points_l.append(dict(measurement='rpi', tags=dict(tag='db_size'), fields=dict(value=db_size)))
    except Exception:
        logging.error(traceback.format_exc())

    # db write
    try:
        if points_l: 
            db.write_points(points_l)
    except Exception:
        logging.error(traceback.format_exc())
    
    time.sleep(60.0)