snmp setup on CentOS

Install the SNMP service on CentOS.

yum install net-snmp

mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.org
vim /etc/snmp/snmpd.conf

rocommunity public 192.168.x.x

P.S. - Replace 192.168.x.x with the IP address of the server that you want to allow SNMP lookups from:

/etc/init.d/snmpd start
chkconfig snmpd on

In firewall open UDP port 161 to your SNMP lookup server.

And Test -
snmpwalk -v 2c -c public 192.168.x.x