<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >Graph a Single SNMP OID</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="The Cacti Manual" HREF="index.html"><LINK REL="UP" TITLE="Advanced Topics" HREF="advanced_topics.html"><LINK REL="PREVIOUS" TITLE="Advanced Topics" HREF="advanced_topics.html"><LINK REL="NEXT" TITLE="Data Input Methods" HREF="data_input_methods.html"><LINK REL="STYLESHEET" TYPE="text/css" HREF="manual.css"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Cacti Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="advanced_topics.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="data_input_methods.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="GRAPH_SNMP_OID" ></A >Chapter 10. Graph a Single SNMP OID</H1 ><P > When dealing with SNMP-enabled devices, there are often times when you want to graph the value of a single OID. This tutorial explains how to do this in Cacti. It also assumes that you have the "SNMP - Generic OID Template" graph template, which is now included in Cacti as of version 0.8.5. If you do not see this template listed under <SPAN CLASS="GUILABEL" >Graph Templates</SPAN >, download the template from the Cacti website in XML form and import it using the <SPAN CLASS="GUILABEL" >Import Templates</SPAN > menu item. </P ><P > To start the process of creating a new graph for your OID, click the <SPAN CLASS="GUILABEL" >New Graphs</SPAN > menu item and select the host that contains the target OID from the dropdown. Under the <SPAN CLASS="GUILABEL" >Graph Templates</SPAN > box, you will see a dropdown on the last line that reads <SPAN CLASS="GUILABEL" >(Select a graph type to create)</SPAN >. From this dropdown, choose "SNMP - Generic OID Template" and click the <SPAN CLASS="GUILABEL" >Create</SPAN > button at the bottom of the page. </P ><P > You will be presented with several fields that will require input before the new graph can be created. They are described in more detail below. </P ><DIV CLASS="TABLE" ><A NAME="AEN1178" ></A ><P ><B >Table 10-1. Field Description: SNMP - Generic OID Template</B ></P ><TABLE BORDER="1" FRAME="border" RULES="all" CLASS="CALSTABLE" ><COL WIDTH="1*"><COL WIDTH="3*"><THEAD ><TR ><TH ALIGN="CENTER" >Name</TH ><TH ALIGN="CENTER" >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD >(Graph) Title</TD ><TD >The title that is to be used for the new graph. It is generally a good idea to keep |host_description| in the title, as to make the graph easier to identify later.</TD ></TR ><TR ><TD >(Graph) Vertical Label</TD ><TD >The text that will be printed along the y-axis of the graph. It is generally used to describe units, such as 'bytes' or 'percent'.</TD ></TR ><TR ><TD >(Graph Items) Legend Color</TD ><TD >The color that will be used to represent the data on the graph.</TD ></TR ><TR ><TD >(Graph Items) Opacity/Alpha Channel</TD ><TD >This optionally provides an opacity (not available with rrdtool-1.0.x) for a colored item.</TD ></TR ><TR ><TD >(Graph Items) Legend Text</TD ><TD >The text that will be used to describe the data on the graph legend.</TD ></TR ><TR ><TD >(Data Source) Name</TD ><TD >The title that is to be used for the new data source. It is generally a good idea to keep |host_description| in the title, as to make the data source easier to identify later.</TD ></TR ><TR ><TD >(Data Source) Maximum Value [snmp_oid]</TD ><TD >The maximum value that will be accepted from the OID. Make sure you choose a value that is reasonable for the data you are trying to graph because anything larger than the maximum will be ignored. If you are graphing a percentage, you should use '100' as the value should never exceed this.</TD ></TR ><TR ><TD >(Data Source) Data Source Type [snmp_oid]</TD ><TD >How the data from the OID should be stored by RRDTool and interpreted on the graph. If the value of the OID represents the actual data, you should use <SPAN CLASS="GUILABEL" >GAUGE</SPAN > for this field. If the OID value is a constantly incrementing number, you should use <SPAN CLASS="GUILABEL" >COUNTER</SPAN > for this field. The two remaining field values, <SPAN CLASS="GUILABEL" >DERIVE</SPAN > and <SPAN CLASS="GUILABEL" >ABSOLUTE</SPAN > can be ignored in most situations.</TD ></TR ><TR ><TD >(Custom Data) OID</TD ><TD >The actual SNMP OID to graph. It is typically a good idea to enter the number OID here as opposed to using MIB names. For instance, to get the number of open files on a Netware server, you would use ".1.3.6.1.4.1.23.2.28.2.7.0" as the OID.</TD ></TR ></TBODY ></TABLE ></DIV ><P > When finished filling in values for these fields, click the <SPAN CLASS="GUILABEL" >Create</SPAN > button. Your new graph can now be accessed through the <SPAN CLASS="GUILABEL" >Graph Management</SPAN > page or the <SPAN CLASS="GUILABEL" >Graphs</SPAN > tab inside of Cacti. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="advanced_topics.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="data_input_methods.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Advanced Topics</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="advanced_topics.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Data Input Methods</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
