Proxmox VE

Watch Scripts for Monitoring

2 min read

Watch Scripts for Monitoring

Overview

Watch scripts monitor system state and trigger actions based on changes. Essential for automated responses to VM events.

Watch Basics

Simple Monitor

#!/bin/bash
# monitor.sh - Monitor VM state
 
while true; do
    STATUS=$(qm status 100)
    if [ "$STATUS" != "running" ]; then
        echo "VM 100 stopped: $STATUS"
        # Send alert
    fi
    sleep 60
done

Using pvesh

#!/bin/bash
# monitor-vms.sh - Watch VM states
 
watch_vm() {
    local vmid=$1
    qm status $vmid
}
 
while true; do
    for vm in 100 101 102; do
        status=$(watch_vm $vm)
        echo "VM $vm: $status"
    done
    sleep 30
done

Event-Based Monitoring

VM State Change

#!/bin/bash
# vm-monitor.sh - React to VM events
 
PREVIOUS_STATE=""
 
while true; do
    STATE=$(qm status 100)
    
    if [ "$STATE" != "$PREVIOUS_STATE" ]; then
        case $STATE in
            running)
                echo "VM started"
                # Action
                ;;
            stopped)
                echo "VM stopped"
                # Action
                ;;
        esac
        PREVIOUS_STATE=$STATE
    fi
    sleep 10
done

Storage Monitoring

#!/bin/bash
# storage-monitor.sh - Check storage
 
THRESHOLD=90
 
while true; do
    for storage in $(pvesm status | grep active | awk '{print $1}'); do
        USAGE=$(pvesm status $storage | grep $storage | awk '{print int($5)}')
        
        if [ $USAGE -gt $THRESHOLD ]; then
            echo "WARNING: $storage at ${USAGE}%"
        fi
    done
    sleep 300
done

Watch Commands

Built-in Watch

# Watch VM metrics
qm monitor 100
 
# Watch resources
watch -n1 'qm status && pvesm status'

Keywords

monitoring watch automation observability

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