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$ sudo yum install net-snmp

# /etc/snmp/snmpd.conf
# rocommunity key IP
rocommunity jiankongbao 60.195.252.107
rocommunity jiankongbao 60.195.252.110

$ sudo iptables -I INPUT 1 -p udp -s 60.195.252.107 --dport 161 -j ACCEPT
$ sudo iptables -I INPUT 1 -p udp -s 60.195.252.110 --dport 161 -j ACCEPT
$ sudo cp /etc/sysconfig/iptables /etc/sysconfig/iptables.bak
$ sudo iptables-save | sudo tee /etc/sysconfig/iptables

$ netstat -lpnu | grep 161
(No info could be read for "-p": geteuid()=509 but you should be root.)
udp        0      0 0.0.0.0:161                 0.0.0.0:*                               -
$ chkconfig --list snmpd
snmpd           0:off 1:off 2:on  3:on  4:on  5:on  6:off