X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=doc%2Frrdgraph.pod;h=f7b6cac4143f6d1023d59828553e520002419b34;hb=30412794da5ccdac222601b7417fc9fbb72558fe;hp=89ea6f75cb409af48f0e80d45d54de5bbffaadbd;hpb=02e00a5b3ef9181c8233c59da672732ece15d47d;p=rrdtool.git

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index 89ea6f7..f7b6cac 100644
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -43,7 +43,7 @@ it. For instance, you might be collecting B<bytes> per second, but
 want to display B<bits> per second. This is what the B<L<data
 calculation|rrdgraph_data/CDEF>> command is designed for. After
 B<consolidating> the data, a copy is made and this copy is modified
-using a rather powerful B<L<RPN|rrdgraph_rpn/>> command set.
+using a rather powerful B<L<RPN|rrdgraph_rpn>> command set.
 
 When you are done fetching and processing the data, it is time to
 graph it (or print it).  This ends the B<rrdtool graph> sequence.
@@ -77,7 +77,7 @@ The start and end of the time series you would like to display, and which
 B<RRA> the data should come from.  Defaults are: 1 day ago until
 now, with the best possible resolution. B<Start> and B<end> can
 be specified in several formats, see
-L<AT-STYLE TIME SPECIFICATION|rrdfetch/> and L<rrdgraph_examples>.
+L<AT-STYLE TIME SPECIFICATION|rrdfetch> and L<rrdgraph_examples>.
 By default, B<rrdtool graph> calculates the width of one pixel in
 the time domain and tries to get data from an B<RRA> with that
 resolution.  With the B<step> option you can alter this behaviour.
@@ -93,6 +93,21 @@ one pixel will silently be ignored.
 A horizontal string at the top of the graph and/or a vertically
 placed string at the left hand side of the graph.
 
+=head2 Right Axis
+
+[B<--right-axis> I<scale>B<:>I<shift>]
+[B<--right-axis-label> I<label>]
+
+A second axis will be drawn to the right of the graph. It is tied to the
+left axis via the scale and shift parameters. You can also define a label
+for the right axis.
+
+[B<--right-axis-format> I<format-string>]
+
+By default the format of the axis lables gets determined automatically. If
+you want todo this your self, use this option with the same %lf arguments
+you know from the PRING and GPRINT commands.
+
 =head2 Size
 
 [B<-w>|B<--width> I<pixels>]
@@ -155,7 +170,7 @@ and thus the throughput may be higher than the WAN line speed.
 
 In order to avoid anti-aliasing blurring effects rrdtool snaps
 points to device resolution pixels, this results in a crisper
-aperance. If this is not to your liking, you can use this switch
+appearance. If this is not to your liking, you can use this switch
 to turn this behaviour off.
 
 Gridfitting is turned off for PDF, EPS, SVG output by default.
@@ -210,7 +225,7 @@ placed every I<label factor> lines.  You can specify C<-y none> to
 suppress the grid and labels altogether.  The default for this option is
 to automatically select sensible values.
 
-If you have set --y-grid to 'none' not only the labels get supressed, also
+If you have set --y-grid to 'none' not only the labels get suppressed, also
 the space reserved for the labels is removed. You can still add space
 manually if you use the --units-length command to explicitly reserve space.
 
@@ -248,7 +263,7 @@ to the more robust B<--alt-y-grid> mode.
 
 How many digits should rrdtool assume the y-axis labels to be? You
 may have to use this option to make enough space once you start
-fideling with the y-axis labeling.
+fiddling with the y-axis labeling.
 
 [B<--units=si>]
 
@@ -267,6 +282,15 @@ Note, that only the image size will be returned, if you run with lazy even
 when using graphv and even when using PRINT.
 
 
+[B<--daemon> I<address>]
+
+Address of the L<rrdcached> daemon. If specified, a C<flush> command is sent
+to the server before reading the RRD files. This allows the graph to contain
+fresh data even if the daemon is configured to cache values for a long time.
+For a list of accepted formats, see the B<-l> option in the L<rrdcached> manual.
+
+ rrdtool graph [...] --daemon unix:/var/run/rrdcached.sock [...]
+
 [B<-f>|B<--imginfo> I<printfstr>]
 
 After the image has been created, the graph function uses printf
@@ -285,7 +309,7 @@ I<COLORTAG> is one of C<BACK> background, C<CANVAS> for the background of
 the actual graph, C<SHADEA> for the left and top border, C<SHADEB> for the
 right and bottom border, C<GRID>, C<MGRID> for the major grid, C<FONT> for
 the color of the font, C<AXIS> for the axis of the graph, C<FRAME> for the
-line around the color spots and finally C<ARROW> for the arrow head pointing
+line around the color spots, and finally C<ARROW> for the arrow head pointing
 up and forward. Each color is composed out of three hexadecimal numbers
 specifying its rgb color component (00 is off, FF is maximum) of red, green
 and blue. Optionally you may add another hexadecimal number specifying the
@@ -300,18 +324,19 @@ Zoom the graphics by the given amount. The factor must be E<gt> 0
 
 [B<-n>|B<--font> I<FONTTAG>B<:>I<size>B<:>[I<font>]]
 
-This lets you customize which font to use for the various text
-elements on the RRD graphs. C<DEFAULT> sets the default value for all
-elements, C<TITLE> for the title, C<AXIS> for the axis labels, C<UNIT>
-for the vertical unit label, C<LEGEND> for the graph legend.
+This lets you customize which font to use for the various text elements on
+the RRD graphs. C<DEFAULT> sets the default value for all elements, C<TITLE>
+for the title, C<AXIS> for the axis labels, C<UNIT> for the vertical unit
+label, C<LEGEND> for the graph legend, C<WATERMARK> for the watermark on the
+edge of the graph.
 
 Use Times for the title: C<--font TITLE:13:Times>
 
-If you do not give a font string you can modify just the sice of the default font:
+If you do not give a font string you can modify just the size of the default font:
 C<--font TITLE:13:>.
 
 If you specify the size 0 then you can modify just the font without touching
-the size. This is especially usefull for altering the default font without
+the size. This is especially useful for altering the default font without
 resetting the default fontsizes: C<--font DEFAULT:0:Courier>.
 
 RRDtool comes with a preset default font. You can set the environment
@@ -352,7 +377,7 @@ no text is rendered bitmapped.
 All text in rrdtool is rendered using Pango. With the B<--pango-markup> option, all
 text will be processed by pango markup. This allows to embed some simple html
 like markup tags using 
- 
+
  <span key="value">text</span>
 
 Apart from the verbose syntax, there are also the following short tags available.
@@ -366,7 +391,7 @@ Apart from the verbose syntax, there are also the following short tags available
  small Makes font relatively smaller, equivalent to <span size="smaller">
  tt    Monospace font
  u     Underline 
- 
+
 More details on L<http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html>.
 
 [B<-G>|B<--graph-render-mode> {B<normal>,B<mono>}]
@@ -434,20 +459,17 @@ You need at least one B<DEF> statement to generate anything. The
 other statements are useful but optional.
 See L<rrdgraph_data> and L<rrdgraph_rpn> for the exact format.
 
-=head2 Graph and print elements
+NOTE: B<Graph and print elements>
 
 You need at least one graph element to generate an image and/or
 at least one print statement to generate a report.
 See L<rrdgraph_graph> for the exact format.
 
-
-=back
-
 =head2 graphv
 
 Calling rrdtool with the graphv option will return information in the
 rrdtool info format. On the command line this means that all output will be
-in key=value format. When used from the perl and ruby bindings a hash
+in key=value format. When used from the Perl and Ruby bindings a hash
 pointer will be returned from the call.
 
 When the filename '-' is given, the contents of the graph itself will also
@@ -471,6 +493,21 @@ There is more information returned than in the standard interface.
 Especially the 'graph_*' keys are new. They help applications that want to
 know what is where on the graph.
 
+=head1 ENVIRONMENT VARIABLES
+
+The following environment variables may be used to change the behavior of
+C<rrdtoolE<nbsp>graph>:
+
+=over 4
+
+=item B<RRDCACHED_ADDRESS>
+
+If this environment variable is set it will have the same effect as specifying
+the C<--daemon> option on the command line. If both are present, the command
+line argument takes precedence.
+
+=back
+
 =head1 SEE ALSO
 
 L<rrdgraph> gives an overview of how B<rrdtool graph> works.