The default net-snmp binary builds don’t come with lm_sensors MIBs configured. If you want to add sensor graphs (voltage, fans, temperatures) to your cacti graph trees, you’ll have to build net-snmp from source and enable the lm_sensors MIBs when configuring.

First, install lm_sensors and configure using sensors-detect. Once you are able to see sensor data by running sensors move on with installing net-snmp.

PKGBUILD (Arch Linux)

# Maintainer: Eric Belanger <eric <at> archlinux.org>
# Contributor: Herbert Molenda <me <at> herbertm.ca>

pkgname=net-snmp
pkgver=5.6.1
pkgrel=2
pkgdesc="net-snmp with lm_sensors MIB"
arch=('i686' 'x86_64')
url="http://www.net-snmp.org/"
license=('custom')
depends=('openssl' 'tcp_wrappers' 'libnl' 'lm_sensors')
makedepends=('setuptools')
optdepends=('perl-term-readkey: for snmpcheck application' 
            'perl-tk: for snmpcheck and tkmib applications'
            'python2: for the python modules')
provides=('ucd-snmp')
options=('!libtool' '!makeflags' '!emptydirs')
source=("http://downloads.sourceforge.net/sourceforge/${pkgname}/${pkgname}-${pkgver}.tar.gz"
        'snmpd.rc')
md5sums=('b4e30ead5783b0bb1d280172c6095ea4'
         '9f0d13676ba1fae1eb7eb178edd85b43')
sha1sums=('45bbf1295253d5379a5d1efd918593160387fd00' '2c679b564a2c319d9ce2714a9776aa0e6d89c60a')

build() {
  cd "${srcdir}/${pkgname}-${pkgver}"
  sed -i -e "s:\(install --basedir=\$\$dir\):\1 --root='${pkgdir}':" Makefile.in
  ./configure --prefix=/usr --sysconfdir=/etc --mandir=/usr/share/man \
    --enable-ucd-snmp-compatibility --enable-ipv6 --with-libwrap --with-python-modules \
    --with-default-snmp-version="3" --with-sys-contact="root@localhost" \
    --with-sys-location="Unknown" --with-logfile="/var/log/snmpd.log" \
    --with-mib-modules="host misc/ipfwacc ucd-snmp/diskio tunnel ucd-snmp/dlmod ucd-snmp/lmsensorsMib" \
    --with-persistent-directory="/var/net-snmp" \
    PYTHONPROG=/usr/bin/python2
  make NETSNMP_DONT_CHECK_VERSION=1 LDFLAGS+="-Wl,-lsensors"
}

package() {
  cd "${srcdir}/${pkgname}-${pkgver}"
  make DESTDIR="${pkgdir}" INSTALL_PREFIX="${pkgdir}" INSTALLDIRS=vendor install
  install -D -m755 "${srcdir}/snmpd.rc" "${pkgdir}/etc/rc.d/snmpd"
  install -D -m644 COPYING "${pkgdir}/usr/share/licenses/${pkgname}/COPYING"
}
</me></eric>

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