Configuration on Proxmox Host

Install snmpd

apt install snmpd

Configure snmpd

Edit /etc/snmp/snmpd.conf

nano /etc/snmp/snmpd.conf

Add basic configuration

# Listen on all interfaces IPv4 only
agentAddress udp:161
# ACCESS CONTROL
view all included .1.3.6.1.2.1.1
view all included .1.3.6.1.2.1.25.1
#Read only snmp v2 with community public
#Change IP to your used IP
rocommunity public 192.168.1.0/24
sysLocation YourCity
sysContact YourName
# Run as root
agentuser root
# Add commands
pass .1.3.6.1.2.1.25.1.8 /bin/sh /root/snmp-cpu-temp.sh
pass .1.3.6.1.2.1.25.1.9 /bin/sh /root/snmp-lvm-used.sh
pass .1.3.6.1.2.1.25.1.10 /bin/sh /root/snmp-smart-status.sh

Restart SNMPD

systemctl restart snmpd.service