NetSNMPd Client Configuration
This page was originally posted by the Observium Team, however with their documentation being updated I can no longer locate it. I have recreated it from a cached page, but focused only on Ubuntu (15.10 at time of writing).
First install Net-SNMP :
# aptitude install snmpd
/etc/default/snmpd looks like this
SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -p /var/run/snmpd.pid'
Info
Through experimenting I prefer the following line
SNMPDOPTS='-Lf /dev/null -u snmp -p /var/run/snmpd.pid'
This also disables logging and as such gets rid of annoying "features" like:
snmpd[4990]: Connection from UDP: 1.2.3.4
Replace the default /etc/snmp/snmpd.conf file with something like this, changing the community, location and contact fields.
# Listen for connections on all interfaces (both IPv4 *and* IPv6)
agentAddress udp:161,udp6:[::1]:161
# Full view access
view all included .1
# system + hrSystem groups only
view systemonly included .1.3.6.1.2.1.1
view systemonly included .1.3.6.1.2.1.25.1
# Default access to full view
rocommunity home default -V all
# Default access to basic system info
#rocommunity public default -V systemonly
# System contact and location
syslocation xxx xxxx Road, xxxxx
syscontact user@domain
# Disk Monitoring
disk / 10000
disk /var 5%
includeAllDisks 10%
# Unacceptable 1-, 5-, and 15-minute load averages
load 12 10 5
# This line allows Observium to detect the host OS if the distro script is installed
extend .1.3.6.1.4.1.2021.7890.1 distro /usr/local/bin/distro
# This lines allows Observium to detect hardware, vendor and serial
extend .1.3.6.1.4.1.2021.7890.2 hardware /bin/cat /sys/devices/virtual/dmi/id/product_name
extend .1.3.6.1.4.1.2021.7890.3 vendor /bin/cat /sys/devices/virtual/dmi/id/sys_vendor
extend .1.3.6.1.4.1.2021.7890.4 serial /bin/cat /sys/devices/virtual/dmi/id/product_serial
# This line allows Observium to collect an accurate uptime
extend uptime /bin/cat /proc/uptime
Get the observium 'distro' script from the scripts/ directory to identify your distribution via SNMP and copy it to /usr/bin/distro.
You should then be able to restart snmpd, # systemctl restart snmpd
And then add the device to your Observium installation!
On devices with a large routing table
You may encounter sloppy SNMP responsiveness and high host load with too many routes installed in combination with netsnmp. Also see this Debian bugreport of a few years back. The last post seems to fix this issue, so if you are running full table, add these lines to snmpd.conf as well:
view all included .1 80
view all excluded .1.3.6.1.2.1.4.21
view all excluded .1.3.6.1.2.1.4.24
view system included .iso.org.dod.internet.mgmt.mib-2.system