ESX5i monitoring with Cacti

Enable SNMP from the ESXi shell. It just needs a bit of editing and services restart:

# vi /etc/vmware/snmp.xml <config><snmpSettings><enable>true</enable><communities>public</communities><targets></targets></snmpSettings></config> 
# 
# chkconfig snmpd on
# chkconfig --list snmpd
snmpd          on
# /etc/init.d/snmpd restart

Add a device using the udc/net template to get you started