directadmin-monitoring.sh

#!/usr/bin/env bash
# Directadmin Monitoring
## Settings
discord="url"
HOSTNAME=`hostname`
DIRECTADMIN="yes or no"  ## will disable DirectAdmin-related monitoring

# Function to add the cron job
add_cron_job() {
    # Get the current user
    user=$(whoami)

    # Check if the cron job already exists
    if crontab -l | grep -q "/usr/local/sbin/directadmin-monitoring.sh"; then
        echo "Cron job already exists. Skipping..."
    else
        # Add the cron job to the user's crontab
        (crontab -l 2>/dev/null; echo "0 * * * * /usr/local/sbin/directadmin-monitoring.sh") | crontab -
        echo "Cron job added successfully."
    fi
}

# Check if there is enough available disk space
total_space=$(df -H | awk '{if($NF=="/") print $2}' | tr -d 'G')
free_space=$(df -H | awk '{if($NF=="/") print $4}' | tr -d 'G')
required_space=1
if (( $(echo "$free_space < $required_space" | bc -l) )); then
    echo "Error: Not enough disk space. Available space: ${free_space}G, Required space: ${required_space}G"
BACKUP_ERROR='{"content": "Alert for: '${HOSTNAME}', Error: Not enough disk space. Available space: '${free_space}' GB which is less than: '${required_space}' GB "}'
curl -H "Content-Type: application/json" -X POST -d "$BACKUP_ERROR" "$discord"    
wait $!
fi

# Check if there is enough free RAM
free_ram=$(free -m | awk '/^Mem/ {print $4}')
if (( $free_ram < 1024 )); then
    echo "Error: Not enough free RAM. Available RAM: ${free_ram}MB, Required RAM: 1024MB"
    RAM_ALERT='{"content": "Alert for: '${HOSTNAME}', Error: Not enough free RAM. Available RAM: '${free_ram}' MB"}'
curl -H "Content-Type: application/json" -X POST -d "$RAM_ALERT" "$discord"    
wait $!
fi

# Check Load Average
load_average=$(uptime | awk -F'[a-z]:' '{ print $2 }' | awk -F', ' '{ print $1 }')
if (( $(bc <<< "$load_average > 1.0") )); then
    echo "Error: High load average. Current load average: ${load_average}"
    LOAD_ALERT='{"content": "Alert for: '${HOSTNAME}', Error: High load average. Current load average: '${load_average}'"}'
    curl -H "Content-Type: application/json" -X POST -d "$LOAD_ALERT" "$discord"
    wait $!
fi


# Check if there is no large Exim Mail Queue
if [[ "$DIRECTADMIN" == "yes" ]]; then
    # Check if there is no large Exim Mail Queue
    mail_queue=$(exim -bpc)
    if (( mail_queue > 50 )); then
        echo "Error: Large mail queue. Email in the mail queue: $mail_queue"
        QUEUE_ALERT='{"content": "Alert for: '${HOSTNAME}', Error: Large mail queue. Email in the mail queue: '${mail_queue}' "}'
        curl -H "Content-Type: application/json" -X POST -d "$QUEUE_ALERT" "$discord"
        wait $!
    fi
fi