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Install Nagios NRPE on FreeNAS

Read through the preamble to see what I tried first and why it didn’t work. Or jump ahead to the working install method. Preamble I’ve been using FreeNAS for a couple of months now, starting with version 9 and later upgrading to version 11. While the experience so far has been great there are a few glaring omissions. First and foremost “monitoring”. There is just no convenient way to monitor the system externally.
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Set fan thresholds with ipmitool

My file server is sporting a SuperMicro X10SDV-4C-TLN2F-O motherboard and the case has two Noctua NF-R8 Redux-1800 PWM exhaust fans to keep things cool and quiet. However I noticed that whenever I set the fan mode in IPMI to Optimal, the fans began to pulse. They slow down, IPMI decides they’ve slowed down to critical levels and spins them back up again. Having no reason to be spinning this fast, they slow back down and the cycle continues again.
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