Introduction

Out of pure personal need I adapted R. Bicelli's pfSense Zabbix Template after the recent Home+Lab License Issue encouraged me to migrate to OPNSense. This is not yet completely tested in all regards and some keys and functionalities may have errors.

I mostly centered myself on fixing OpenVPN monitoring and basic keys support. Feel free to contribute!

Original Zabbix pfSense Template by R. Bicelli https://github.com/rbicelli/pfsense-zabbix-template

• 2024-02-01: Fix for OPNSense 24.1 get_interfaces_info() function deprecation was implemented. The templates were also updated with new item key implementations for the Network Interfaces.
• 2024-04-29:
  • Fixed Individual Gateway Status support.
  • Fixed OpenVPN Server Data Fetching to support both Legacy and MVC Instances.
  • Renamed all function prefixes from pfz_ to opnf_.
  • Minor fixes to further implement IPSec (Both Strongswan and Legacy instances) detection and status reporting, not tested.
  • Other minor fixes.

Tested on Zabbix 6.0 LTS

Would you like to support me?

Functionalities

Tested

• Service Discovery
• OpenVPN Server Discovery and Statistics
• OpenVPN Server Clients Discovery
• All default FreeBSD Items
• Network Statistics
• Gateway Discovery

Added

• P2P TLS OpenVPN Server Remote Address Item Monitoring

Known Issues, or untested

• OPNSense OpenVPN Clients (as in site to site clients) may not be discovered correctly yet.
• DHCP Lease Functions probably don't work.
• IPSec Functions are untested.
• CARP Functions are untested.

Installation

OPNSense Configuration

First you need to download the PHP Script onto your OPNSense. Login with SSH and execute the following command:

curl --create-dirs -o /root/scripts/opnsense_zbx.php https://raw.githubusercontent.com/dblanque/opnsense-zabbix/main/opnsense_zbx.php

Zabbix Configuration

To enable this template you must add the following custom keys in the Zabbix Service Configuration. Services → Zabbix Agent → Settings

You may also copy paste it into the config file: /usr/local/etc/zabbix_agentd.conf

UserParameter=opnsense.mbuf.current,netstat -m | grep "mbuf clusters" | cut -f1 -d ' ' | cut -d '/' -f1
UserParameter=opnsense.mbuf.cache,netstat -m | grep "mbuf clusters" | cut -f1 -d ' ' | cut -d '/' -f2
UserParameter=opnsense.mbuf.max,netstat -m | grep "mbuf clusters" | cut -f1 -d ' ' | cut -d '/' -f4
UserParameter=opnsense.discovery[*],sudo /usr/local/bin/php /root/scripts/opnsense_zbx.php discovery $1
UserParameter=opnsense.interfaces[*],sudo /usr/local/bin/php /root/scripts/opnsense_zbx.php interfaces $1
UserParameter=opnsense.value[*],sudo /usr/local/bin/php /root/scripts/opnsense_zbx.php $1 $2 $3
UserParameter=opnsense.states.max,grep "limit states" /tmp/rules.limits | cut -f4 -d ' '
UserParameter=opnsense.states.current,sudo /usr/local/bin/php /root/scripts/opnsense_zbx.php states

You may also enable Root by allowing it in the Zabbix Settings and add the keys on the Advanced tab.

Do not forget to add the Zabbix Server or Zabbix Proxy IP Address to your Active Check Servers Field in the Zabbix Features tab as well as your Zabbix Servers field in the Main Settings tab.

Enable System Version Cron

Please add the following cronjob to your /etc/cron.d/opnsense_sysversion

# Example of job definition:
# .---------------- minute (0 - 59)
# |  .------------- hour (0 - 23)
# |  |  .---------- day of month (1 - 31)
# |  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
# |  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# |  |  |  |  |
# *  *  *  *  * user-name command to be executed
0 9,21	* * *	root	sudo /usr/local/bin/php /root/scripts/opnsense_zbx.php sysversion_cron

Then restart cron with /etc/rc.d/cron restart

Et Voilá

Happy monitoring!