


RRDCGI(1)                    rrdtool                    RRDCGI(1)


NAME
       rrdcgi - create web pages containing RRD graphs based on
       templates

SYNOPSIS
       #!/path/to/rrdcgi [--goodfor|-g seconds] [--filter]
       [--refresh|-r]

DESCRIPTION
       rrdcgi is a sort of very limited script interpreter. Its
       purpose is to run as a cgi-program and parse a web page
       template containing special <RRD:: tags. rrdcgi will
       interpret and act according to these tags.  In the end it
       will printout a web page including the necessary CGI
       headers.

       rrdcgi parses the contents of the template in 2 steps. In
       each step it looks only for a subset of tags. This allows
       to nest tags.

       The argument parser uses the same semantics as you are
       used from your c shell.

       --goodfor|-g seconds
               Specify the number of seconds this page should
               remain valid. This will prompt the rrdcgi to
               output a Last-Modified and a Expire header.

       --filter
               Assume that rrdcgi is being run as a filter and
               not as a cgi.

       --refresh|-r
               If the --goodfor flag is specified, then --refresh
               will cause rrdcgi to output a Refresh header with
               the value of the --goodfor value.

       Pass 1


       RRD::CV name
               Inserts the CGI variable of the given name.

       RRD::CV::QUOTE name
               Inserts the CGI variable of the given name but
               quotes it, ready for use as an argument in another
               RRD:: tag. So even when there are spaces in the
               value of the CGI variable it will still be
               considered as one argument.

       RRD::CV::PATH name
               Inserts the CGI variable of the given name, quotes
               it and makes sure the it starts neither with a '/'
               nor contains '..'. This is to make sure that no



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RRDCGI(1)                    rrdtool                    RRDCGI(1)


               problematic pathnames can be introduced through
               the CGI interface.

       Pass 2


       RRD::INCLUDE filename
               Include the contents of the given file into the
               page returned from the cgi

       Pass 3


       RRD::GRAPH rrdgraph arguments
               This tag creates the RRD graph defined in its
               argument and then gets replaced by an appropriate
               <IMG> tag referring to the graph.  The --lazy
               option in RRD graph can be used to make sure that
               graphs are only regenerated when they are out of
               date. The arguments to the RRD::GRAPH tag work as
               described in the rrdgraph manual page.

               Use the --lazy option in your RRD::GRAPH tags, to
               reduce the load on your server. This option makes
               sure that graphs are only regenerated when the old
               ones are out of date.

               If you do not specify your own --imginfo format,
               the following will be used:

                <IMG SRC="%s" WIDTH="%lu" HEIGHT="%lu">

               Note that %s stands for the filename part of the
               graph generated, all directories given in the GIF
               file argument will get dropped.

       RRD::PRINT number
               If the preceding  RRD::GRAPH tag contained and
               PRINT arguments, then you can access their output
               with this tag. The number argument refers to the
               number of the PRINT argument. This first PRINT has
               number 0.

EXAMPLE
       The example below creates a web pages with a single RRD
       graph.











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RRDCGI(1)                    rrdtool                    RRDCGI(1)


        #!/usr/local/bin/rrdcgi
        <HTML>
        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
        <BODY>
        <H1>RRDCGI Example Page</H1>
        <P>
        <RRD::GRAPH demo.gif --lazy --title="Temperatures"
                 DEF:cel=demo.rrd:exhaust:AVERAGE
                 LINE2:cel#00a000:"D. Celsius">

        </P>
        </BODY>
        </HTML>


EXAMPLE 2
       This script is slightly more elaborate, it allows you to
       run it from a form which sets RRD_NAME. RRD_NAME is then
       used to select which RRD you want to use a source for your
       graph.

        #!/usr/local/bin/rrdcgi
        <HTML>
        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
        <BODY>
        <H1>RRDCGI Example Page for <RRD::CV RRD_NAME></H1>
        <H2>Selection</H2>
        <FORM><INPUT NAME=RRD_NAME TYPE=RADIO VALUE=roomA> Room A,
              <INPUT NAME=RRD_NAME TYPE=RADIO VALUE=roomB> Room B.
              <INPUT TYPE=SUBMIT></FORM>
        <H2>Graph</H2>
        <P>
        <RRD::GRAPH <RRD::CV::PATH RRD_NAME>.gif --lazy
                 --title "Temperatures for "<RRD::CV::QUOTE RRD_NAME>
                 DEF:cel=<RRD::CV::PATH RRD_NAME>.rrd:exhaust:AVERAGE
                 LINE2:cel#00a000:"D. Celsius">

        </P>
        </BODY>
        </HTML>


AUTHOR
       Tobias Oetiker <oetiker@ee.ethz.ch>













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RRDCGI(1)                    rrdtool                    RRDCGI(1)



























































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