snmp

snmp.sh

# manual
http://wiki.ubuntuusers.de/SNMP
# install
# http://l3net.wordpress.com/2013/05/12/installing-net-snmp-mibs-on-ubuntu-and-debian/
sudo apt-get install snmp snmpd 
sudo nano /etc/snmp/snmp.conf
# comment out this line
> # mibs : 

sudo nano /etc/snmp/snmptrapd.conf 
# folgende Zeile einfügen
> disableAuthorization yes

# configure firewall
http://www.cyberciti.biz/faq/debain-ubuntu-install-net-snmpd-server/


# configure snmp
sudo nano /etc/snmp/snmptrapd.conf
> authCommunity log,execute,net public

# receive traps nd log to Std out
sudo snmptrapd -f -Lo

# send trap in other terminal
snmptrap -v 1 -c public localhost "" "" 1 0  ""


# edit and restart snmpd
sudo nano /etc/default/snmpd 
/etc/init.d/snmpd restart
# oder
sudo service snmpd restart

# watch syslog (or messages) for errors while restarting
tail -F /var/log/syslog
### add startup service
#! /bin/sh
# /etc/init.d/blah
#

# Some things that run always
touch /var/lock/blah

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting script blah "
    echo "Could do more here"
    ;;
  stop)
    echo "Stopping script blah"
    echo "Could do more here"
    ;;
  *)
    echo "Usage: /etc/init.d/blah {start|stop}"
    exit 1
    ;;
esac

exit 0

# make it executable
chmod 755 /etc/init.d/blah


### see also: http://www.bitbull.ch/wiki/index.php/Configure_snmp_trap_sending

### end startup service


# sudo nano /etc/snmp/snmpd.conf
> proc <process> 

sudo service snmpd restart

# watch the following table for the proc entries (0..n) in the order of proc calls in snmpd.conf
UCD-SNMP-MIB::prTable


How to enable SNMP Monitoring on Ubuntu Server 12.04.2
Install SNMPD  

$ sudo apt-get install snmpd

Create a backup file of snmpd.conf original file that we will edit later

$ sudo mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.ori

Create the new snmpd.conf file 

$ sudo vim /etc/snmp/snmpd.conf

Add the file with these lines

rocommunity public
syslocation "Your Location"
syscontact admin@domain.com

Then edit the /etc/default/snmpd file

$ sudo vim /etc/default/snmpd

Disable this line below by adding # in front of the line 

#SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'

And add a new line 

SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -I -smux -p /var/run/snmpd.pid -c /etc/snmp/snmpd.conf'

Restart the SNMPD service

$ sudo /etc/init.d/snmpd restart
* Restarting network management services

Then you're done!

##########

This mentions:
If you have downloaded MIBs (e.g. using snmp-mibs-downloader) I suggest to comment the following line in /etc/default/snmpd: 
export MIBS=/usr/share/snmp/mibs

But it seems you need to do this also for LM-SENSORS-MIB.
However for Ubuntu you need to set the following line in /etc/default/snmpd:

export MIBS=/usr/share/mibs/netsnmp 


#########

# add process supervision script
sudo touch /usr/local/bin/checkvdserver
sudo chmod +x /usr/local/bin/checkvdserver

sudo nano /usr/local/bin/checkvdserver

# paste this:
##################### begin file
#!/bin/bash

#########################################################
#            Copyright Siemens AG Schweiz 2014          #   
#                                                       #
# Purpose: Process supervision with SNMP Traps          #
# Author:  A. Neck                                      #
# Date:    27.1.2014                                    #
#########################################################

# Description:
# This script checks whether the required processes are running.
# SNMP Traps are sent, when the state changes, or in the specified interval in the bad case.

# read variable (stored in shared memory between script calls)
read count < /dev/shm/checkvdserver_count

# initialize variable if not set with 1
# 0: running, [1..interval]: not running, interval: sending trap while not running
count=${count:-1}

# interval for sending traps when at least 1 process is not running. 
# e.g. 15 for sending every 15 min if this script is called every minute.
interval=15

# actual number of processes
ps_1=$(ps -e | pgrep node | wc -l) # TODO change "node" to process name
ps_2=$(ps -e | pgrep node | wc -l) # TODO change "node" to process name

# min number of processes
nb_1=2
nb_2=2

if [ $ps_1 -ge $nb_1 ] && [ $ps_2 -ge $nb_2 ]
then
  # echo running
  if [ $count -ne 0 ]
  then
    count=0
    # UCD-SNMP-MIB::ucdStart
    # snmptrap -v 2c -c public localhost "" .1.3.6.1.4.1.2021.251.1
    # IF-MIB::linkUp 
    snmptrap -v 2c -c public localhost "" .1.3.6.1.6.3.1.1.5.4
  fi
else
  # echo not running
  if [ $count -ge $interval ] || [ $count -eq 0 ]
  then
    count=1
    # UCD-SNMP-MIB::ucdShutdown
    # snmptrap -v 2c -c public localhost "" .1.3.6.1.4.1.2021.251.2
    # IF-MIB::linkDown
    snmptrap -v 2c -c public localhost "" .1.3.6.1.6.3.1.1.5.3
  else
    ((count++))    
  fi
fi

# write variable
echo $count > /dev/shm/checkvdserver_count

################### end file


sudo crontab -e
* * * * * . /usr/local/bin/checkvdserver