Recently I’ve been focusing on something I’ve overlooked for too long- monitoring. I wanted to share a quick guide on monitoring Debian / Ubuntu with SNMPv3 and PRTG as I couldn’t find any high level, up-to-date information readily available. I’ve gone as lightweight as possible and only installed snmpd to get disk space, CPU and memory monitoring working.
On the Debian / Ubuntu device you would like to monitor-
sudo apt-get update
sudo apt-get install snmpd
Stop the snmpd service
sudo systemctl stop snmpd
Create credentials for SNMPv3 authentication
sudo nano /var/lib/snmp/snmpd.conf
Add the following line beneath the comment block at the top. Replace USERNAME, PASSWORD and ENCRYPTIONKEY with your values. Note the encryption key, which is simply a string shared with client and server
createUser USERNAME SHA PASSWORD AES ENCRYPTIONKEY
Edit the snmpd conf file
Comment out the following line-
Add the following line to allow remote access from our PRTG server-
And the following line to grant read only access to the user we created earlier-
rouser USERNAME priv
Save and close the file.
Start the snmpd service
sudo systemctl start snmpd
Over on the PRTG server, add a device
Add the IP address of the Linux device we were just working on
Add credentials, matching what was created on the Linux device previously
Select the device created, then Add Sensor
Narrow down sensors by selecting Linux/MacOS and SNMP then select the required sensor.
Give PRTG around a minute to collect data, then the sensor will be visible from the dashboard