Proxmox is widely used for virtualization, but without monitoring, performance issues can go unnoticed.
In this tutorial, you will learn how to monitor Proxmox with PRTG Network Monitor using a basic setup.
This guide is perfect for beginners and system administrators starting with Proxmox monitoring.
We will configure essential sensors to monitor CPU usage, memory consumption, and system availability.
PRTG provides real-time insights into your Proxmox host and virtual environment.
With proper monitoring, you can detect issues early and prevent downtime.
This setup works well for home labs and production servers alike.
This video is part of the PRTG Network Monitoring Tutorial Series.

Step 1: Enable SNMP on Proxmox

On the Proxmox host:
apt update
apt install snmpd -y

Configure SNMP:
nano /etc/snmp/snmpd.conf
Example of simple and secure configuration in a LAN (delete all content from the paste file):
# … Proxmox
##################################################################################

# Listen on all interfaces (IPv4)
agentAddress udp:161

# Read-only community – only for PRTG
rocommunity public-tsf 192.168.16.205

# System information
sysLocation Proxmox-Host
sysContact admin@local

# Load average
load 12 14 14

# Disk monitoring
disk / 10%
disk /var/lib/vz 10%

Allow IP PRTG (or LAN subnet)
Restart SNMP
systemctl restart snmpd
systemctl enable snmpd
systemctl status snmpd

Step 2: Add Proxmox to PRTG

Devices → Local Probe → Add Device
Device name: Proxmox Host 1
IP: Proxmox IP
Save

Step 3: Add the sensor you should use

🔹 1. Ping
→ Check if the host is live

🔹 2. SNMP CPU Load
• Add Sensor → SNMP CPU Load

🔹 3. SNMP Memory v2

• Add Sensor → SNMP Memory

RAM difference between Proxmox node and PRTG

• Cache / buffer

• PRTG is not considered “available immediately”

Edit PRTG to minimize for accuracy

Lower: warning 10%, error 5%

🔹 4. SNMP Disk Free v2

• Add Sensor → SNMP Disk Free
• Select disk: /, /var/lib/vz, local-lvm

Suggested correct thresholds
For sensor /:

• Lower Warning: < 20% free

• Lower Error: < 10% free

🔹 5. SNMP Traffic (NIC)

• Add Sensor → SNMP Traffic
• Select interface:

o vmbr0
o Physical NIC (eno1 / enpXsY)