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The following procedure will install and configure snmp daemon on your Redhat-based distribution such as CentOS & Fedora. Here are the steps:

1. Verify if snmp package is installed, there are few ways

[root@localhost ~]# rpm -qa | grep snmp

[root@localhost ~]# snmpwalk
-bash: snmpwalk: command not found

[root@localhost ~]# ls /etc/snmp*
ls: /etc/snmp*: No such file or directory

This mean net-snmp package is not installed yet

2. Install net-snmp & net-snmp-utils package via yum or up2date

[root@localhost ~]# yum install net-snmp net-snmp-utils
Loaded plugins: fastestmirror, security
Loading mirror speeds from cached hostfile
* base: mirror.usonyx.net
* extras: mirror.usonyx.net
* updates: mirror.usonyx.net
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package net-snmp.i386 1: set to be updated
–> Processing Dependency: libsensors.so.3 for package: net-snmp
—> Package net-snmp-utils.i386 1: set to be updated
–> Running transaction check
—> Package lm_sensors.i386 0:2.10.7-9.el5 set to be updated
–> Finished Dependency Resolution

Dependencies Resolved

Package              Arch       Version                    Repository     Size
net-snmp             i386       1:       updates       703 k
net-snmp-utils       i386       1:       updates       191 k
Installing for dependencies:
lm_sensors           i386       2.10.7-9.el5               base          511 k

Transaction Summary
Install       3 Package(s)
Upgrade       0 Package(s)

Total download size: 1.4 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): net-snmp-utils-        | 191 kB     00:00
(2/3): lm_sensors-2.10.7-9.el5.i386.rpm                  | 511 kB     00:01
(3/3): net-snmp-              | 703 kB     00:01
Total                                           408 kB/s | 1.4 MB     00:03
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing     : lm_sensors                                               1/3
Installing     : net-snmp                                                 2/3
Installing     : net-snmp-utils                                           3/3

net-snmp.i386 1:  net-snmp-utils.i386 1:

Dependency Installed:
lm_sensors.i386 0:2.10.7-9.el5


up2date -v -i net-snmp-utils net-snmp

3. Configure /etc/snmp/snmpd.conf, basic config would be specifying the community string. You can use any text editor like vi or use echo command

[root@localhost ~]# echo rocommunity freelinuxtutorials >> /etc/snmp/snmpd.conf

4. Restart snmp service

[root@localhost ~]# service snmpd restart
Stopping snmpd: [FAILED]
Starting snmpd: [  OK  ]

5. Check snmpd if it’s working using snmp utilities like snmpwalk. You should get an output something like this:

[root@localhost ~]# snmpwalk -v2c -c freelinuxtutorials localhost
SNMPv2-MIB::sysDescr.0 = STRING: Linux localhost.localdomain 2.6.18-308.13.1.el5 #1 SMP Tue Aug 21 17:10:06 EDT 2012 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (356) 0:00:03.56

Quick tip:

To make sure snmpd will start on boot, use chkconfig command
[root@localhost init.d]# ls -l /etc/rc3.d/ | grep snmpd
lrwxrwxrwx 1 root root 15 Aug 29 15:56 K50snmpd -> ../init.d/snmpd

[root@localhost init.d]# chkconfig snmpd on
[root@localhost init.d]# ls -l /etc/rc3.d/ | grep snmpd
lrwxrwxrwx 1 root root 15 Aug 29 15:57 S50snmpd -> ../init.d/sn

Notice snmpd changed from K50 to S50, meaning snmpd will start on boot. Enjoy!

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