(Cacti installation and use guide? Cacti is a software implemented in PHP language. Its main function is to use SNMP service to obtain data, and then use RRDTOOL to store and update data. When users need to view data, use RRDTOOL to generate charts and present them to users. Therefore, SNMP and RRDTOOL are the key to cacti. SNMP is related to data collection, and RRDTOOL is related to data storage and chart generation.)