Monitor VMware ESXi Host Using LibreNMS

[Aiden Liam]

Configuring SNMP on VMware ESXi host
Log in to the ESXi host with root user credentials. Once you have logged in, check the
current SNMP configurations

https://actsupport.com/monitor-vmware-esxi-host-using-librenms/

esxcli system snmp get

Authentication:

Communities:

Enable: false

Engineid:

Hwsrc: indications

Loglevel: info

Notraps:

Port: 161
Privacy:
Remoteusers:
Syscontact:
Syslocation:
Targets:
Users:
V3targets:

You can start the configuration by setting the community string(s).

#esxcli system snmp set –communities <community>

e.g

esxcli system snmp set –communities actsupport

Configure SNMP Port

esxcli system snmp set –port 161

Enable SNMP on the server

esxcli system snmp set –enable true

Set syscontact

esxcli system snmp set –syscontact infrastructure@actsupport.com

Set Server Location:

esxcli system snmp set –syslocation US-RA0154

Check SNMP firewall rules:

esxcli network firewall get

Default Action: DROP
Enabled: true
Loaded: true

esxcli network firewall ruleset rule list | grep snmp

snmp Inbound UDP Dst 161 161

esxcli network firewall ruleset allowedip list | grep snmp

snmp All

Only if you want to limit the access to SNMP from the trusted subnets or IP addresses, you can set it as below:

esxcli network firewall ruleset allowedip add –ruleset-id snmp –ip-address 192.168.3.10

esxcli network firewall ruleset allowedip add –ruleset-id snmp –ip-address 192.168.1.0/24

esxcli network firewall ruleset set –ruleset-id snmp –enabled true

To allow from any source IP you can execute the below command:

#esxcli network firewall ruleset set –ruleset-id snmp –allowed-all true

To test whether the snmpd service is working fine, use the snmpwalk command on LibreNMS host:

$ snmpwalk -v 1 -c actsupport <ESXi-host-ip>

E.g
You will have to restart snmp service after making the changes:

/etc/init.d/snmpd restart

Add VMware ESXi host to LibreNMS
Once you have completed the configuration of SNMP on ESXi hosts, you can start adding the hosts to LibreNMS for monitoring. LibreNMS provides you the ability to automatically add devices on your network using the Auto Discovery feature. All the discovery methods run when discovery runs every 6 hours by default and within 5 minutes for new devices.