Net-SNMP refresh / re-install?

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Net-SNMP refresh / re-install?

How does one go about fully refreshing OSX Net-SNMP configuration, resetting it factory defaults?

Reason I ask: a number of our Xserves were upgraded from 10.6 to 10.8 to 10.9 or 10.10 and in the process appear to have their Net-SNMP executables and/or configuration corrupted - e.g. snmpd daemons crashing frequently, not reporting CPU/mem loads, etc. Tried comparing folder structures between affected and unaffected nodes and haven't gotten too far.

Appreciate any ideas!

Xserve 3,1-OTHER, OS X Yosemite (10.10.3), upgraded from 10.8 or 10.6

Posted on Jul 10, 2015 3:02 AM

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Answer 1

Mar 30, 2016 4:33 PM in response to Alex (DV411)

The canonical method to reset a net-snmp installation to factory defaults in Mac OS X (there's no difference between client & server in this case) is:

sudo launchctl unload -w /System/Library/LaunchDaemons/org.net-snmp.snmpd.plist

sudo cp /etc/snmp/snmpd.conf.default /etc/snmp/snmpd.conf

```
sudo rm /usr/share/snmpd.conf
```
```
sudo rm -rf /var/db/net-snmp
```

This resets the snmpd.conf file to the default & clears out any added users and instance data. This should be valid back to 10.6 or so, possibly earlier, but I'm not sure.

In 10.11.x Apple updated the net-snmp version from 5.6 to 5.6.2.1 which may cause some issues.

The LMSensors MIB may not be well supported on Xserve hardware in the later OS versions.

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Answer 2

Mar 31, 2016 7:16 AM in response to Alex (DV411)

FWIW, brew has net-snmp available, if you really want to install a different version — or if you already have a parallel version installed via brew or some other means:

$ brew info net-snmp

net-snmp: stable 5.7.3 (bottled) [keg-only]

Implements SNMP v1, v2c, and v3, using IPv4 and IPv6

http://www.net-snmp.org/

Not installed

From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/net-snmp.rb

==> Dependencies

Required: openssl â

==> Options

--with-python

Build with python support

==> Caveats

This formula is keg-only, which means it was not symlinked into /usr/local.

OS X already provides this software and installing another version in

parallel can cause all kinds of trouble.

$

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