(Cacti uses snmpget to obtain data and RRDTOOL to draw graphics. You don't need to know the complex parameters of RRDTOOL. It provides very powerful data and user management functions. It can specify that each user can view the tree structure, host and any graph. It can also be combined with LDAP for user authentication. At the same time, it can also add its own templates. The functions are very powerful and perfect. Friendly interface. This time, we also summarized some experiences, such as how to solve the problem without drawing)