To setup SNMP daemon firstly install the required packages.
yum install net-snmp net-snmp-devel net-snmp-libs net-snmp-utils
Then edit the main configuration file
Find the line starting with "com2sec" and change the community from "public" to your secret v2c community name. If you also wish to use version v1 you can also add a line "rocommunity SECRET_COMMUNITY" at the end of the file.
You will then need to start the service
service snmpd start
And configure it to start automatically
systemctl enable snmpd
The SNMP daemon should now be running which can be used to monitor the server via Cacti etc.