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
July 27th, 2009 at 19:49
Is there any way to get around the dependency on lm_sensors? I am not comfortable installing this highly insecure package on my servers.
September 9th, 2009 at 18:08
@Paul: This notice may help: http://www.pro-linux.de/security/4126 This vulnerability was fixed in ver. 2.9.1-r1.
February 24th, 2010 at 13:29
Hi,
thanks for the guide, helpded me!
But, I wonder if you have a guide for snmptraps för redhat aswell?
February 24th, 2010 at 14:14
Hi Anders,
No I do not. Avoid traps is my answer. Traps looks like a good idea but in the long term it takes away the responsibility from the owner of the problem to the poor person that handles the monitor system.
Read my general monitoring guideline:-)
http://www.it-slav.net/blogs/2009/08/30/general-systems-and-network-management-guidelines-part-1/
September 22nd, 2010 at 11:33
Thanks for the guide – made the install process really easy
January 10th, 2011 at 12:24
[...] and graph performance. So view this as a beginner howto for future reference.There is good info here for beginning SNMP.1. Install SNMP daemon and Utilities yum install net-snmp-utils [...]
January 12th, 2011 at 14:22
[...] in the digital saltmineThis guide describe howto install and configure SNMP on Ubuntu.In an earlier article I have described howto set it up on RHES or CentOS, it is slightly different in [...]
January 20th, 2011 at 12:05
[...] I’m playing with SNMP to monitor traffic, load etc on the critial servers. Found this simple tutorial about getting it all set up. Now all I have to do is figure out what to actually [...]
April 19th, 2011 at 09:14
[...] an earlier article I have described howto set it up on RHES or CentOS, it is slightly different in [...]
September 29th, 2011 at 22:34
Many thanks, that made it *very* easy!
December 4th, 2011 at 09:29
in the step
[root@dull ~]# snmpwalk -v 1 -c public -O e 127.0.0.1
which ip should i use i have dsl at home connected through router
December 4th, 2011 at 09:46
when i enter the command snmpwalk -v 1 -c public -O e with my own ip it says no response
December 6th, 2011 at 20:46
This article describes how to setup the snmp agent on RHEL or Centos. Not how to retrive data from your router.
December 6th, 2011 at 20:47
Look into the logfiles.
Have you started snmpd?
January 23rd, 2012 at 16:02
Thanks peter
Its working well
January 24th, 2012 at 15:21
'yum install net-snmp-utils' will not install snmpd (at least on CentOS 6). 'yum install net-snmp net-snmp-utils' will do.
January 24th, 2012 at 16:52
Thanks for the hint