RRDCGI(1)                    rrdtool                    RRDCGI(1)


NNAAMMEE
       rrdcgi - create web pages containing RRD graphs based on
       templates

SSYYNNOOPPSSIISS
       #!/path/to/rrrrddccggii [----ggooooddffoorr|--gg _s_e_c_o_n_d_s] [----ffiilltteerr]
       [----rreeffrreesshh|--rr]

DDEESSCCRRIIPPTTIIOONN
       rrrrddccggii 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. rrrrddccggii will
       interpret and act according to these tags.  In the end it
       will printout a web page including the necessary CGI head­
       ers.

       rrrrddccggii 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.

       ----ffiilltteerr
               Assume that rrdcgi is being run as a filter and
               not as a cgi.

       ----rreeffrreesshh|--rr
               If the ----ggooooddffoorr flag is specified, then ----rreeffrreesshh
               will cause rrdcgi to output a Refresh header with
               the value of the ----ggooooddffoorr value.

       PPaassss 11


       RRD::CV _n_a_m_e
               Inserts the CGI variable of the given name.

       RRD::CV::QUOTE _n_a_m_e
               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 consid­
               ered as one argument.

       RRD::CV::PATH _n_a_m_e
               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
               problematic pathnames can be introduced through
               the CGI interface.

       RRD::GETENV _v_a_r_i_a_b_l_e
               Get the value of an environment variable.

                <RRD::GETENV REMOTE_USER>

               might give you the name of the remote user given
               you are using some sort of access control on the
               directory


       PPaassss 22


       RRD::GOODFOR _s_e_c_o_n_d_s
               Specify the number of seconds this page should
               remain valid. This will prompt the rrdcgi to out­
               put a Last-Modified, an Expire and if the number
               of seconds is _n_e_g_a_t_i_v_e a Refresh headers.

       RRD::INCLUDE _f_i_l_e_n_a_m_e
               Include the contents of the given file into the
               page returned from the cgi

       RRD::SETENV _v_a_r_i_a_b_l_e _v_a_l_u_e
               If you want to present your graphs in another time
               zone than your own, you could use

                <RRD::SETENV TZ UTC>

               to make sure everything is presented in Universal
               Time. Note that the values permitted to TZ depend
               on your OS.

       RRD::TIME::LAST _r_r_d_-_f_i_l_e _s_t_r_f_t_i_m_e_-_f_o_r_m_a_t
               This gets replaced by the last modification time
               of the selected RRD. The time is _s_t_r_f_t_i_m_e-formated
               with the string specified in the second argument.

       RRD::TIME::NOW _s_t_r_f_t_i_m_e_-_f_o_r_m_a_t
               This gets replaced by the current time of day. The
               time is _s_t_r_f_t_i_m_e-formated with the string speci­
               fied in the argument.

       PPaassss 33


       RRD::GRAPH _r_r_d_g_r_a_p_h _a_r_g_u_m_e_n_t_s
               This tag creates the RRD graph defined in its
               argument and then gets replaced by an appropriate
               <IMG> tag referring to the graph.  The ----llaazzyy
               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 RRRRDD::::GGRRAAPPHH tag work as
               described in the rrrrddggrraapphh manual page.

               Use the ----llaazzyy 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 ----iimmggiinnffoo 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 _n_u_m_b_e_r
               If the preceding  RRRRDD::::GGRRAAPPHH tag contained and
               PPRRIINNTT arguments, then you can access their output
               with this tag. The _n_u_m_b_e_r argument refers to the
               number of the PPRRIINNTT argument. This first PPRRIINNTT has
               _n_u_m_b_e_r 0.

EEXXAAMMPPLLEE 11
       The example below creates a web pages with a single RRD
       graph.

        #!/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>


EEXXAAMMPPLLEE 2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>


EEXXAAMMPPLLEE 33
       This example shows how to handle the case where the RRD,
       graphs and cgi-bins are seperate directories

        #!/.../bin/rrdcgi
        <HTML>
        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
        <BODY>
        <H1>RRDCGI test Page</H1>
        <RRD::GRAPH
         /.../web/gifs/testhvt.gif
         --imginfo '<IMG SRC=/.../gifs/%s WIDTH=%lu HEIGHT=%lu >'
         --lazy --start -1d --end now
         DEF:http_src=/.../rrds/test.rrd:http_src:AVERAGE
         AREA:http_src#00ff00:http_src
        >
        </BODY>
        </HTML>

       Note 1: Replace /.../ with the relevant directories

       Note 2: The SRC=/.../gifs should be paths from the view of
       the webserver/browser

AAUUTTHHOORR
       Tobias Oetiker <oetiker@ee.ethz.ch>


1.0.35                      2001-02-21                  RRDCGI(1)