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 :