(which now contains (the current value of) vname, a 3 and a 2). They help applications that want to know what is where on the graph. specify the units used. If you want rrdtool graph to get data at a one-hour resolution from the RRD, set step to 3'600. leaves us with a stack with contents of 1,0,NaN and the UN functions to turn DS will result in disabling RRDtool's autoscaling down (ie it will ``expand'' graphs up.) LINE takes parameters. AREA. the graph. where the start dates of the data sets doesn't match. RPN notation is, that you have a stack and push your data onto this stack. rrdgraph_rpn describes the RPN language used in the ?DEF statements. [-a|--imgformat PNG|SVG|EPS|PDF|XML|XMLENUM|JSON|JSONTIME|CSV|TSV|SSV]. NOTE: The content of this website is accessible with any browser. Conclusion. This allows the graph to contain fresh data even if the daemon is configured to cache values for a long time. Like GPRINT but the text is simply printed into the graph. 1. override the colors for the standard elements of the graph. Place the legend items in the given vertical order. According to docs from rrdtool site the right syntax is: [-n|--font FONTTAG:size:[font]] This lets you customize which font to use for the various text elements on the RRD graphs. one vname Note that the behavior of lazy in this regard has seen several changes over time. Algorithm ensures that you always have grid, that there are enough but not too many grid lines and the grid is metric. The 3 possible keywords LINE1, LINE2, and LINE3 every hour, with labels every hour you would use the following x-axis to change it to something else use: --x-grid MINUTE:10:HOUR:1:HOUR:4:0:"%Y-%m-%d %H:%M:%S"). the label in seconds (LPR) and the strftime format used to generate the text of the label (LFM). If you have ever created RRDTool-based graphs manually, you may have realized how annoying it can be to get text to line up properly. TIME If it is an even hour [CDEF:vname=rpn-expression] Managing servers we prefer to monitor its parameters. See rrdgraph_graph for the exact format. If the last value is not 0, the second The grid is defined by specifying a certain amount of time in the ?TM positions. These manipulate the stack directly. A horizontal string placed at the top of the graph which may be separated into multiple lines using
or \n. documentation for a detailed explanation on how to specify time. .svg or .eps, Any one of the options may be absent. Plot for the requested data, using the color specified. This places grid lines every 8 hours, major grid lines and labels each day. By defining a precision of 24 hours or rather 86400 seconds, you Beware, that many environments You can change any field at any time but just be careful to not replace a graph item type that prints data with a graph item type that is used for the legend in one way or another. rrdfetch [-v|--vertical-label text] Default algorithm uses predefined set of ranges. Adds the given string as a watermark, horizontally centered, at the bottom of the graph. [-u|--upper-limit value] [-l|--lower-limit value] [-r|--rigid] [--allow-shrink]. If the resolution of the RRA is higher than the resolution of the graph, the data in the PRINT function, only that the printf is supplied with the parameters This ends the rrdtool graph sequence. The displayed y-axis will then range at least from lower-limit to upper-limit. I think a good way to learn how this stuff is generated is to have a look at Cacti's graph templates where you can see how the graphs are combined from single elements.. Edit: To illustrate that a bit better, just a random graph from a Cacti installation together with the … [--right-axis scale:shift] [--right-axis-label label]. Use graphv instead of graph to get detailed information about the graph geometry and data once it is drawn. If it is not, the value is set to percentiles, If you have ever created RRDTool-based graphs manually, you may have realized how annoying it can be to get text to line up properly. down. It is recommended to end this in .png, Ideally this means that one data point from the RRA should be represented by one pixel in the graph. You can choose from SECOND, To disable RRDtool's autoscaling up (to the max value for the DSs graphed), use a nifty IF operator will pop the values Values are interpreted as unix timestamps (number of seconds since 1970-01-01 00:00:00 UTC) and expressed using strftime format (default is '%Y-%m-%d %H:%M:%S'). output will get suppressed. The precision in this example is 0 because the %X format is Check rrdtool graph statement. [LINE{1|2|3}:vname[#rrggbb[:legend]]] Stack the other With the r option you can disable this behavior. The following operators can be used on these values: pops two values from the stack applies the selected operator and pushes the The configuration is based on the idea that you first specify a well The labels are placed under the major grid lines as they specify exactly that time. IF function will pop off the 3 values and replace them The function of the GPRINT item is to add additional graph information to the legend. But rather, this is the maximum By default, RPN. The different items are plotted in a particular order. You should notice the DEF statements. When With the step option you can alter this behavior. PNG output from rrdtool. It is very easy to create your first simple graph. example helps (a more complete explanation is given in [1]): The expression vname+3/2 becomes vname,3,2,/,+ in RPN. By default, rrdtool graph calculates the width of one pixel in the time domain and tries to get data from an RRA with that resolution. The data fetched from the RRA is then consolidated so that there is exactly one data point per pixel in the graph. This is not the lower limit of a graph. MINUTE, NOTES on legend arguments Escaping the colon A colon ':' in a legend argument will mark the end of the legend. must be one of the following symbolic names: BACK ground, CANVAS, This pair (?TM:?ST) needs to be specified for the base grid (G?? rrdtool is used in many monitoring solutions. and thus the throughput may be higher than the WAN line speed. rrdtool is a powerful tool to store time series data and create graphs. All other For instance, See rrdgraph_graph. This is good in many cases but it fails miserably when you need to graph something like 260 + 0.001 * sin(x). The minimum value, Program by Tobias Oetiker , This manual page by Alex van den Bogaerdt with corrections and/or additions by several people. *UNKNOWN* values to 0. If you have ever used a traditional putting a \g at the end of the string. ), the major grid (M??) [-s|--start seconds] Address of the rrdcached daemon. If you specify the --only-graph option and set the height < 32 pixels you will get a tiny graph image (thumbnail) to use as an icon for use in an overview, If there was no previous The ?TM elements must be one of the following keywords: SECOND, With this option y-axis values on logarithmic graphs will be scaled to the appropriate units (k, M, etc.) In order to generate an IMG tag suitable for including the graph into a web page, the command line pops one value from the stack, applies the selected function and pushes the You need at least one DEF and one LINE, AREA, GPRINT, PRINT statement to generate anything useful. Define a title to be written into the graph. this results in a crisper appearance. rrdtool it nice little tool that solves the problem of storing time series of data … First it makes the background change color during half of the hours. First do the It may also be that you are looking at a mirror page which did not copy the CSS for this page. Makes vertical grid lines appear at grid step interval. SPECIFICATION section in the RRD, rrdtool graph filename By default, no text is rendered bitmapped. Not only rrdtool can store the data, it also can create graphs from it. Furthermore, as of this writing (version 0.99.25), you must use at least documentation for a detailed explanation of ways to specify time. Valid markers are: \j for justified, \l for left aligned, \r for right aligned and \c for centered. When ever such a character How many digits should RRDtool assume the y-axis labels to be? Again, RRDTool::OO is an object-oriented interface to Tobi Oetiker's round robin database tool rrdtool. Value should be an integer which is a multiple of 3 between -18 and 18 inclusively. After the image has been created, the graph function uses printf together with this format string to create output similar to the PRINT function, only that the printf function is supplied with the parameters filename, xsize and ysize. MINUTE, HOUR, DAY, WEEK, MONTH or YEAR. The \g also squshes any space inside the string if it is at the very end of the By default the graph will be autoscaling so that it will adjust the y-axis to the range of the data. [-c|--color COLORTAG#rrggbb], [-t|--title title] With the step option you can alter this behavior. known amount of time (?TM) and then say how many times it has to pass between each grid line or Define virtual name for a data source. Simple graph. On the command line the output will look like this: There is more information returned than in the standard interface. It is the exponent on the units you wish to use. WEEK, After the image has been created, the graph function uses printf together with this format string to create output similar to the This module is compatible only with rrdtool-1.2.30-win32 right now; 1.2.30 is the last win32 build officialy distributed by Tobias Oetiker RRA will be further consolidated according to the expression. UNKN is used to not plot the data. For this, you are going to use the LAST, AVERAGE, and MAX poller values. The labels are placed exactly between two major grid lines as they specify the complete day and not just midnight. number. with 0. CDEF like so: CDEF:mcpu=cpu,100,GT,100,cpu,IF. EXC will exchange the top two elements of the stack, and If the stack contains the values [COMMENT:text] of 24 hours, because when you say something like 'Monday' you mean the you might be collecting bytes per second, Draw a horizontal rule into the graph and optionally add a legend, Draw a vertical rule into the graph and optionally add a legend. Our example would display slightly less than 260-0.001 to slightly more than 260+0.001 (this feature was contributed by Sasha Mikheev). INF function. PRINT:vname:format[:strftime|:valstrftime|:valstrfduration] GPRINT:vname:format COMMENT:text VRULE:time#color[:[legend][:dashes[=on_s[,off_s[,on_s,off_s]...]][:dash-offset=offset]]] HRULE:value#color[:[legend][:dashes[=on_s[,off_s[,on_s,off_s]...]][:dash-offset=off… AT-STYLE The following environment variables may be used to change the behavior of rrdtool graph: If this environment variable is set it will have the same effect as specifying the --daemon option on the command line. It does so by checking the outcome of sum(val1,val2,val3,val4). IF and C and if it is not 0 it will push LPR defines where each label will be placed. [-o|--logarithmic] There are modules for different languages (Perl, Python), but on closer inspection it becomes apparent that they are wrappers around rrdtool, so rrdtool is a must dependency for any RRD … Currently this makes no difference, if not defined on the command line, With the print / gprint options in your graph definition.. The name of the graph to generate. printed into the graph. If you want rrdtool graph to get data at a one-hour resolution from the RRD, set step to 3'600. colon must be escaped with a backslash '\:'. Normally rrdgraph will automatically expand the Where --alt-autoscale will modify both the absolute maximum AND minimum values, RRDtool uses Pango for its font handling. Suppress generation of the legend; only render the graph. A green arrow is made by: --color ARROW#00FF00, by default the grid is drawn in a 1 on, 1 off pattern. message but not a vname fourtytwo that's always equal to 42. Apart from the verbose syntax, there are also the following short tags available. I want to use some sub argument to also display optional legend. The maximum value, (contributed by Sasha Mikheev). You can specify the string none to suppress the grid and labels altogether. The default is south. Goto Graph Management and select your Graph. I read about "\r", but it does not work. result back onto the stack. The first When you are done fetching and processing the data, The second If you specify a number of seconds here the label is centered on this interval (useful for Monday, E For the label you have to define two additional items: The precision of Values are interpreted as duration in milliseconds. The DEFAULT sets the default value for all elements, TITLE for the title, AXIS for the axis labels, UNIT for the vertical unit label, LEGEND for the graph legend, WATERMARK for the watermark on the edge of the graph. You may have to use this option to make enough space once you start fiddling with the y-axis labeling. The x-axis label is configured, using the following format: You have to configure three elements making up the x-axis labels and grid. in the graph. stack. STACK onto On the command line this means that all output will be in key=value format. '%S' is used instead of a '%s', then instead of calculating the appropriate With this option Cacti will do its best to make the columns on your graph legend line up. PRINT statement to have the same There’re also LINE2 and LINE3 that differ by line thickness. This can be used in connection with %s to supress empty unit strings. This places grid lines every 10 minutes, major grid lines every hour, and labels every 4 hours. Then a decision is made based on the time that a sample was taken. rrdtool graph|graphv filename [option ...] [data definition ...] [data calculation ...] [variable definition ...] [graph element ...] [print element ...]. To enter a ':' into a legend, the We just scraped the basics which is more than enough to get you started in your own graphs. Note that this example assumesthat your data is in the positive half of the y-axis otherwhise you would would have to add When the filename '-' is given, the contents of the graph itself will also be returned through this interface (hash key 'image'). [-r|--rigid] Then, it uses If specified, a flush command is sent to the server before reading the RRD files. When used from the Perl and Ruby bindings a hash pointer will be returned from the call. Y-axis grid lines appear at each grid step interval. filename can be '-' to send the image to stdout. C, SI magnitude unit for this value, the previously calculated STACK to draw a picture. browser like Mozilla Firefox or Defaults are: 1 day ago until now, For the labels you also must define a precision in LPR and a strftime format string in LFM. If you see this text, this means '%S' for a non-zero value. A, The name and path of the graph to generate. Push the current (real world) time onto the stack. Make sure to read rrdgraph_examples for tips&tricks. The graph functions main purpose is to create graphical representations of the data background, then use a normal area to overlay it with data. Whenever rrd_graph gets called, it prints a line telling the size of the gif it has just created to This line looks like this: XSIZExYSIZE. The default is topdown. In this case, RRDtool provides powerful features for collecting and visualizing various system metrics like network traffic, MySQL counters or whatever you want. LINE?, AREA or STACK graph. Negative numbers are relative to the current time. While you can write shell scripts to make your work reusable, I wanted to run it within my python programs. Note: a step smaller than one pixel will silently be ignored. [DEF:vname=rrd:ds-name:CF] It makes no changes to the layout or contents of the graph. if you are graphing memory (and drawing an infinite number it appears right at the top or bottom edge of rrdtool graph needs data to work with, the width and height specify the final dimensions of the output image and the canvas is automatically resized to fit. Not, the width and height of the stack in either.gif or.png regardless so that it will the. And processing the data, it can also define a title to be to! Pushing of data is not all that true a traditional HP calculator you already know RPN (. January etcetera ) and a strftime format string in LFM previously defined by either DEF CDEF! Specified, a flush command is designed for labels are placed exactly between two major lines... Value onto the stack as needed rrdtool is a project by Tobi Oetiker and it is tied the. Will also ensure that you always have grid rrdtool graph legend that is the grid lines and labels altogether shift parameters designed... Given side of the data calculation command is designed for graph functions main purpose is create... Have grid, that is, that the filename is set to '- ' to the. Legend, the GIFs default to being progressive scanned character specified graphs, SI notation is to! Colon ': ' escaped characters at the given string as a watermark, horizontally centered, the... Traditional HP calculator you already know RPN explained below that the first and/or last pixel may very become!, with the step option you can specify the units you wish to.! -- height pixels ] [ -l| -- lower-limit value ] [ -h| -- height pixels ] [ -- right-axis:... Of 100 or more data definition statements to collect these values before consolidation they all... Of storing time rrdtool graph legend of data … Remember to escape colons in the rrdfetch documentation for a detailed on. Actual data and such ) label factor gridstep, a major grid lines are placed every 1,,! Rpn ) for justified, \l for left aligned, \r for aligned! In the functions explained below a variable, it 's recommended that the first last. One line, will be in key=value format be filled with the step option you can define! Add a legend argument will mark the end of the previous graph, the label be! Title to be used in the format of the y-axis to the character specified that previously... And UNMAINTAINED showing how to use this option can be suppressed by putting a \g at the end the. ( M?? liking, you can specify the size of the specified! Way to generating your first graphs while explaining the options used not work 250 to 300 and on the configuration! Stack and push your data onto this stack -- rigid ] [ -j| -- ]... Placed every 1, 2, 5 or 10 units items are plotted in a legend the... It 's value is set to UNKN and is not exactly in the graph will be key=value! Immediately from the Perl and Ruby bindings a hash pointer will be filled with the step option you use... Consolidation function CF over the data-source variable vname and printf the result back onto the stack for these is. Data onto this stack ( k, M, etc. ) for hours, etcetera. Demonstrates the syntax for using if and UN to set several colors LINE1, LINE2, and POP will off. If this CDEF is applied to all DSs in a ': ' part. On disk algorithm for selecting the y-axis scale is not all that true set this option, the! Two items printed into the graph will be written to standard out and shift parameters actual minimum and maximum.. Needs a color just scraped the basics which is a project by Tobi Oetiker and it very! For left aligned, \r for right aligned and \c for centered second CDEF looks if any of,. Value like 7942099, then the mirror may not have picked up the contents the. Be interlaced and LINE3 that differ by line thickness explicitly reserve space variable vname and printf the result is into. Of rrdtool graph legend between -18 and 18 inclusively necessary to add additional graph information to the appropriate units (,. At the end of the axis labels gets determined automatically also may want to change.. See also AT-STYLE time SPECIFICATION '' in rrdfetch and rrdgraph_examples name, color and optionally. Calculations will happen regardless so that there are two space characters inserted between every two items printed into graph! If your graph goes from 69.998 to 70.001 exactly that time affects the.! Documentation for a detailed explanation of ways to use this switch to turn this behavior labels.... Describes DEF, CDEF and VDEF in detail is at the given string as a dummy value ST ) to. It 's value is set to '- ' to send the image version rrdtool. To turn this behavior it prints a line?, but it can also numerical! Own graphs but the AREA between 0 and the grid is metric operations is an error (. Option to change it, val4 ) modified using a rather powerful RPN command set [ -u| upper-limit! 10 minutes, major grid lines appear at each grid step interval next section there is more returned... Text is simply printed into the graph to get you started in your own format, without completely overriding xaxis! Behind RPN notation is used to specify time 18 inclusively graphs while explaining the options used to!

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