Chapter 6. How to Graph Your Network

Type

Description

Supported Options

Places Used

External SNMP

Calls the net snmp

All SNMP options

Web interface and PHP

snmpwalk and snmpget

poller (poller.php)

binaries that are installed on

your system.

Internal SNMP (php snmp) Uses PHP's SNMP

Version 1 Only (Community Web interface and PHP

functions which are linked

and Port)

poller (poller.php)

against net snmp or

ucd snmp at compile time.

Cactid SNMP

Links directly against

All SNMP options

C Based Poller (cactid)

net snmp or ucd snmp and

calls the API directly.

6.2. Creating the Graphs

Now that you have created some devices, it is time to create graphs for these devices. To do this, select the New Graphs

menu option under the Create heading. You will see a screen similar to the image pictured below.

Figure 6 2. Creating New Graphs

The dropdown menu that contains each device should be used to select the host that you want to create new graphs

for. The basic concept to this page is simple, place a check in each row that you want to create a graph for and click

Create.

If you are creating graphs from inside a "Data Query" box, there are a few additional things to keep in mind. First

is that you may encounter the situation as pictured above with the "SNMP   Interface Statistics" data query. If this

occurs you may want to consult the section on debugging data queries to see why your data query is not returning

any results. Also, you may see a "Select a graph type" dropdown box under some data query boxes. Changing the

value of this dropdown box affects which type of graph Cacti will make after clicking the Create button. Cacti only

displays this dropdown box when there is more than one type to choose from, so it may not be displayed in all cases.

Once you have selected the graphs that you want to create, simply click the Create button at the bottom of the page.

You will be taken to a new page that allows you to specify additional information about the graphs you are about to

create. You only see the fields here that are not part of each template, otherwise the value automatically comes from

the template. When all of the values on this page look correct, click the Create button one last time to actually create

your graphs.

If you would like to edit or delete your graphs after they have been created, use the Graph Management item on the

menu. Likewise, the Data Source menu item allows you to manage your data sources in Cacti.

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