Monitoring TrueNAS with Zabbix

Convincing TrueNAS to be compliant with Zabbix monitoring is apparently quite a process. It should be easy — both ends speak SNMP — but that doesn’t seem to mean it actually is.

• TrueNAS System ⇒ Services ⇒ SNMP:
  • Set Location field
  • Contact field blank
  • Community field set
  • SNMPv3 support enabled
  • Username set to ABCD (dummy value)
  • Authentication type set to SHA
  • Password set to EFGH (dummy)
  • Privacy protocol set to AES
  • Privacy passphrase set to IJKL (dummy)
  • Auxiliary parameters blank
  • Expose zlstat via SNMP enabled
  • Log level set to Error
• Zabbix host configuration
  • IP and DNS name set (connect to IP)
  • Port 161
  • SNMP version set to SNMPv3
  • Max repetition count set to 10
  • Context name blank
  • Security name set to ABCD (the Username field on TrueNAS)
  • Security level set to authPriv
  • Authentication protocol set to SHA1
  • Authentication passphrase set to EFGH (Password field on TrueNAS)
  • Privacy protocol set to AES128
  • Privacy passphrase set to IJKL (Privacy passphrase field on TrueNAS)
  • Use combined requests enabled
• Zabbix template settings
  • Using one template: TrueNAS CORE by SNMP
    • Templates/Applications

See also

• https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/464714-snmpv3-authentication-issue-with-truenas is the forum post that finally got it working
• https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/507574-snmp-error-cannot-retrieve-oid-time-out

• Installed snmpget (Gentoo: emerge -a net-analyzer/net-snmp)
• snmpget -v 3 -u <user> -l authPriv -a SHA -A <authpw> -x AES -X <privpw> <ip> .1.3.6.1.4.1.2021.4.4.0 works, returns UCD-SNMP-MIB::memAvailSwap.0 = INTEGER: 0 kB
• Playing with -a and -x options indicate -a SHA and -a SHA1 work, no others. -x AES seems to be only option recognized by snmpget.

Broken pool status SNMP

See also

• https://forums.truenas.com/t/truenas-scale-25-x-broken-snmp-librenms/56219/2
• https://www.truenas.com/community/threads/snmp-oid-for-zpoolhealthtype.77822/
• https://github.com/librenms/librenms/issues/18127
• https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/truenas_snmp/template_app_truenas_core_snmp.yaml?at=release%2F6.0#1755

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