1RRDCGI(1)                           rrdtool                          RRDCGI(1)
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NAME

6       rrdcgi - Create web pages containing RRD graphs based on templates
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SYNOPSIS

9       "#!/path/to/"rrdcgi [--filter|-f]
10

DESCRIPTION

12       rrdcgi is a sort of very limited script interpreter. Its purpose is to
13       run as a cgi-program and parse a web page template containing special
14       <RRD:: tags. rrdcgi will interpret and act according to these tags.  In
15       the end it will printout a web page including the necessary CGI
16       headers.
17
18       rrdcgi parses the contents of the template in 3 steps. In each step it
19       looks only for a subset of tags. This allows nesting of tags.
20
21       The argument parser uses the same semantics as you are used from your
22       C-shell.
23
24       --filter|-f
25               Assume that rrdcgi is run as a filter and not as a cgi.
26
27   Keywords
28       RRD::CV name
29               Inserts the CGI variable of the given name.
30
31       RRD::CV::QUOTE name
32               Inserts the CGI variable of the given name but quotes it, ready
33               for use as an argument in another RRD:: tag. So even when there
34               are spaces in the value of the CGI variable it will still be
35               considered to be one argument.
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37       RRD::CV::PATH name
38               Inserts the CGI variable of the given name, quotes it and makes
39               sure it starts neither with a '/' nor contains '..'. This is to
40               make sure that no problematic pathnames can be introduced
41               through the CGI interface.
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43       RRD::GETENV variable
44               Get the value of an environment variable.
45
46                <RRD::GETENV REMOTE_USER>
47
48               might give you the name of the remote user given you are using
49               some sort of access control on the directory.
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51       RRD::GOODFOR seconds
52               Specify the number of seconds this page should remain valid.
53               This will prompt the rrdcgi to output a Last-Modified, an
54               Expire and if the number of seconds is negative a Refresh
55               header.
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57       RRD::INCLUDE filename
58               Include the contents of the specified file into the page
59               returned from the cgi.
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61       RRD::SETENV variable value
62               If you want to present your graphs in another time zone than
63               your own, you could use
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65                <RRD::SETENV TZ UTC>
66
67               to make sure everything is presented in Universal Time. Note
68               that the values permitted to TZ depend on your OS.
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70       RRD::SETVAR variable value
71               Analog to SETENV but for local variables.
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73       RRD::GETVAR variable
74               Analog to GETENV but for local variables.
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76       RRD::TIME::LAST rrd-file strftime-format
77               This gets replaced by the last modification time of the
78               selected RRD. The time is strftime-formatted with the string
79               specified in the second argument.
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81       RRD::TIME::NOW strftime-format
82               This gets replaced by the current time of day. The time is
83               strftime-formatted with the string specified in the argument.
84
85               Note that if you return : (colons) from your strftime format
86               you may have to escape them using \ if the time is to be used
87               as an argument to a GRAPH command.
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89       RRD::TIME::STRFTIME START|END start-spec end-spec strftime-format
90               This gets replaced by a strftime-formatted time using the
91               format strftime-format on either start-spec or end-spec
92               depending on whether START or END is specified.  Both start-
93               spec and end-spec must be supplied as either could be relative
94               to the other.  This is intended to allow pretty titles on
95               graphs with times that are easier for non RRDtool folks to
96               figure out than "-2weeks".
97
98               Note that again, if you return : (colon) from your strftime
99               format, you may have to escape them using \ if the time is to
100               be used as an argument to a GRAPH command.
101
102       RRD::GRAPH rrdgraph arguments
103               This tag creates the RRD graph defined by its argument and then
104               is replaced by an appropriate <IMG ... > tag referring to the
105               graph.  The --lazy option in RRD graph can be used to make sure
106               that graphs are only regenerated when they are out of date. The
107               arguments to the RRD::GRAPH tag work as described in the
108               rrdgraph manual page.
109
110               Use the --lazy option in your RRD::GRAPH tags, to reduce the
111               load on your server. This option makes sure that graphs are
112               only regenerated when the old ones are out of date.
113
114               If you do not specify your own --imginfo format, the following
115               will be used:
116
117                <IMG SRC="%s" WIDTH="%lu" HEIGHT="%lu">
118
119               Note that %s stands for the filename part of the graph
120               generated, all directories given in the PNG file argument will
121               get dropped.
122
123       RRD::PRINT number
124               If the preceding  RRD::GRAPH tag contained any PRINT arguments,
125               then you can access their output with this tag. The number
126               argument refers to the number of the PRINT argument. The first
127               PRINT has number 0.
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129       RRD::INTERNAL <var>
130               This tag gets replaced by an internal var. Currently these vars
131               are known: VERSION, COMPILETIME.  These vars represent the
132               compiled-in values.
133

EXAMPLE 1

135       The example below creates a web page with a single RRD graph.
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137        #!/usr/local/bin/rrdcgi
138        <HTML>
139        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
140        <BODY>
141        <H1>RRDCGI Example Page</H1>
142        <P>
143        <RRD::GRAPH demo.png --lazy --title="Temperatures"
144                 DEF:cel=demo.rrd:exhaust:AVERAGE
145                 LINE2:cel#00a000:"D. Celsius">
146
147        </P>
148        </BODY>
149        </HTML>
150

EXAMPLE 2

152       This script is slightly more elaborate, it allows you to run it from a
153       form which sets RRD_NAME. RRD_NAME is then used to select which RRD you
154       want to use as source for your graph.
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156        #!/usr/local/bin/rrdcgi
157        <HTML>
158        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
159        <BODY>
160        <H1>RRDCGI Example Page for <RRD::CV RRD_NAME></H1>
161        <H2>Selection</H2>
162        <FORM><INPUT NAME=RRD_NAME TYPE=RADIO VALUE=roomA> Room A,
163              <INPUT NAME=RRD_NAME TYPE=RADIO VALUE=roomB> Room B.
164              <INPUT TYPE=SUBMIT></FORM>
165        <H2>Graph</H2>
166        <P>
167        <RRD::GRAPH <RRD::CV::PATH RRD_NAME>.png --lazy
168                 --title "Temperatures for "<RRD::CV::QUOTE RRD_NAME>
169                 DEF:cel=<RRD::CV::PATH RRD_NAME>.rrd:exhaust:AVERAGE
170                 LINE2:cel#00a000:"D. Celsius">
171
172        </P>
173        </BODY>
174        </HTML>
175

EXAMPLE 3

177       This example shows how to handle the case where the RRD, graphs and
178       cgi-bins are separate directories
179
180        #!/.../bin/rrdcgi
181        <HTML>
182        <HEAD><TITLE>RRDCGI Demo</TITLE></HEAD>
183        <BODY>
184        <H1>RRDCGI test Page</H1>
185        <RRD::GRAPH
186         /.../web/pngs/testhvt.png
187         --imginfo '<IMG SRC=/.../pngs/%s WIDTH=%lu HEIGHT=%lu >'
188         --lazy --start -1d --end now
189         DEF:http_src=/.../rrds/test.rrd:http_src:AVERAGE
190         AREA:http_src#00ff00:http_src
191        >
192        </BODY>
193        </HTML>
194
195       Note 1: Replace /.../ with the relevant directories
196
197       Note 2: The SRC=/.../pngs should be paths from the view of the
198       webserver/browser
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AUTHOR

201       Tobias Oetiker <tobi@oetiker.ch>
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2051.8.0                             2022-03-14                         RRDCGI(1)
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