AVG CPU/RAM

#!/bin/bash

# Log file location
LOG_FILE="<pathToLogfile>/cpu_ram_usage.log"

# MQTT Broker details
MQTT_HOST=<yourMQTTBroker>
MQTT_PORT=<yourMQTTPort (default 1883)>
MQTT_TOPIC=<yourBaseTopicForMonitoredVM> # NOTE: on the "pub" below I´ve attached CPU / RAM to the base topic in order to distinguish between them
MQTT_USER=<yourMQTTUser>
MQTT_PASS=<yourMQTTUserPass>

exec > "$LOG_FILE" 2>&1
while true; do
    # Initialize total CPU and RAM usage
    total_cpu=0
    total_ram=0
    count=0

    # Function to get CPU and RAM usage
    get_usage() {
        # Get CPU usage as percentage
        cpu_usage=$(top -bn1 | grep "Cpu(s)" | awk '{print $2 + $4}')

        # Get RAM usage as percentage
        ram_total=$(grep MemTotal /proc/meminfo | awk '{print $2 / 1024}') # in MiB
        ram_available=$(grep MemAvailable /proc/meminfo | awk '{print $2 / 1024}') # in MiB
        ram_usage=$(echo "scale=2; 100 - ($ram_available / $ram_total * 100)" | bc)

        # Accumulate total CPU and RAM usage
        total_cpu=$(echo "$total_cpu + $cpu_usage" | bc)
        total_ram=$(echo "$total_ram + $ram_usage" | bc)
        count=$((count + 1))
    }

    # Collect data every minute for 1 hour
    for i in {1..60}; do
        get_usage
        sleep 60
    done

    # Calculate average CPU and RAM usage
    avg_cpu=$(echo "$total_cpu / $count" | bc -l)
    avg_ram=$(echo "$total_ram / $count" | bc -l)

    # Format to 2 decimal places
    formatted_avg_cpu=$(printf "%.2f" $avg_cpu)
    formatted_avg_ram=$(printf "%.2f" $avg_ram)


    # Publish the average to MQTT topic
    mosquitto_pub -h "$MQTT_HOST" -p $MQTT_PORT -u $MQTT_USER -P $MQTT_PASS -t "$MQTT_TOPIC/cpu" -m "$formatted_avg_cpu"
    mosquitto_pub -h "$MQTT_HOST" -p $MQTT_PORT -u $MQTT_USER -P $MQTT_PASS -t "$MQTT_TOPIC/ram" -m "$formatted_avg_ram"

    echo "Published average CPU and RAM usage to MQTT topic."
done