Install and configure SNMP on RHEL or CentOS

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This guide describe howto install and do a basic configure of SNMP on a RedHat Enterprise Linux or CentOS. Probably it will work on many other *nix systems.

1. Installation

Run command yum install net-snmp-utils

[root@dull etc]# yum install net-snmp-utils
Loading "fastestmirror" plugin
Loading "dellsysidplugin" plugin
...
...
Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Installing:
 net-snmp-utils          i386       1:5.3.1-24.el5_2.2  updates           182 k
Installing for dependencies:
 net-snmp                i386       1:5.3.1-24.el5_2.2  updates           698 k

Transaction Summary
=============================================================================
Install      2 Package(s)
Update       0 Package(s)
Remove       0 Package(s)

Total download size: 879 k
Is this ok [y/N]: y

Answer y

Downloading Packages:



(1/2): net-snmp-utils-5.3 100% |=========================| 182 kB    00:02
(2/2): net-snmp-5.3.1-24. 100% |=========================| 698 kB    00:06
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
 Installing: net-snmp                     ######################### [1/2]
  Installing: net-snmp-utils               ######################### [2/2]
Installed: net-snmp-utils.i386 1:5.3.1-24.el5_2.2
Dependency Installed: net-snmp.i386 1:5.3.1-24.el5_2.2
Complete!



Now it is installed


2. Configure


I’m careful so I do a backup of the snmpd config file.


[root@dull ~]# mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.org 


Create a new config file.


[root@dull ~]# vi /etc/snmp/snmpd.conf


rocommunity  public
syslocation  "PDC, Peters DataCenter"
syscontact  peter@it-slav.net


Start the snmpd service


[root@dull ~]# /etc/init.d/snmpd start


Do a snmpwalk to make sure it is working


[root@dull ~]# snmpwalk -v 1 -c public -O e 127.0.0.1
SNMPv2-MIB::sysDescr.0 = STRING: Linux dull 2.6.18-92.1.17.el5 #1 SMP Tue Nov 4 13:45:01 EST 2008 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (16748) 0:02:47.48
SNMPv2-MIB::sysContact.0 = STRING: peter@it-slav.net
SNMPv2-MIB::sysName.0 = STRING: dull
SNMPv2-MIB::sysLocation.0 = STRING: "PDC, Peters DataCentral"
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (1) 0:00:00.01
...


...


Yes, it is working


And finally, make sure snmpd starts next time you restart your machine.


[root@dull ~]# chkconfig snmpd on


3. Monitor example


Below is an example of how it looks using op5 Monitor a Nagios based Enterprise Monitor solution.




4. Useful links


    

  • op5 Statistics, a cacti based graph tool 
    • 

  • op5 Monitor, an Enterprise Class Monitoring system based on Nagios 
    • 

  • Net-SNMP, an open source implementation of SNMP 
    • 

  • Cacti, an open source graph tool 
    • 

  • Nagios, the number 1 monitor tool
    • 



The following easy steps will install snmp daemon on your CentOS/RHEL server :


 


yum install net-snmp net-snmp-utils


now snmpd simple configuration ( change SECRET_NAME to a complex string ) :


 


echo rocommunity SECRET_NAME > /etc/snmp/snmpd.conf


start snmpd :


 


service snmpd restart


also make sure it starts on boot :


 


chkconfig snmpd on


last step to check snmpd is working ( change SECRET_NAME to the string you have chose before ) :


 


snmpwalk -v 1 -c SECRET_NAME -O e 127.0.0.1


you should get an output like below :

	


	

				



	


	

		

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