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rrdupdate

Name
     rrdupdate - Store a new set of values into the RRD

Synopsis
     rrdtool {update | updatev} filename [--template|-t ds-
     name[:ds-name]...]  [--skip-past-updates|-s]
     [--daemon|-d address] [--] N:value[:value]...
     timestamp:value[:value]...  at-timestamp@value[:value]...

Description
     The update function feeds new data values into an RRD. The
     data is time aligned (interpolated) according to the
     properties of the RRD to which the data is written.

     updatev This alternate version of update takes the same
             arguments and performs the same function. The v
             stands for verbose, which describes the output
             returned. updatev returns a list of any and all
             consolidated data points (CDPs) written to disk as a
             result of the invocation of update. The values are
             indexed by timestamp (time_t), RRA (consolidation
             function and PDPs per CDP), and data source (name).
             Note that depending on the arguments of the current
             and previous call to update, the list may have no
             entries or a large number of entries.

             Since updatev requires direct disk access, the
             --daemon option cannot be used with this command.

     filename
             The name of the RRD you want to update.

     --template|-t ds-name[:ds-name]...
             By default, the update function expects its data
             input in the order the data sources are defined in
             the RRD, excluding any COMPUTE data sources (i.e. if
             the third data source DST is COMPUTE, the third
             input value will be mapped to the fourth data source
             in the RRD and so on). This is not very error
             resistant, as you might be sending the wrong data
             into an RRD.

             The template switch allows you to specify which data
             sources you are going to update and in which order.
             If the data sources specified in the template are
             not available in the RRD file, the update process
             will abort with an error message.

             While it appears possible with the template switch
             to update data sources asynchronously, RRDtool
             implicitly assigns non-COMPUTE data sources missing
             from the template the *UNKNOWN* value.

             Do not specify a value for a COMPUTE DST in the
             update function. If this is done accidentally (and
             this can only be done using the template switch),
             RRDtool will ignore the value specified for the
             COMPUTE DST.

             The caching daemon rrdcached cannot be used together
             with templates yet.

     --skip-past-updates|-s
             When updating an rrd file with data earlier than the
             latest update already applied, rrdtool will issue an
             error message an abort. This option instructs
             rrdtool to silently skip such data. It can be useful
             when re-playing old data into an rrd file and you
             are not sure how many updates have already been
             applied.

     --daemon|-d address
             If given, RRDTool will try to connect to the caching
             daemon rrdcached at address. If the connection is
             successfully established the values will be sent to
             the daemon instead of accessing the files directly.
             If the connection cannot be established it will fall
             back to direct file-access.  While this is
             convenient, it can silently create problems so
             please read the warning in the examples.

             For a list of accepted formats, see the -l option in
             the rrdcached manual.

     {N | timestamp}:value[:value]...
             The data used for updating the RRD was acquired at a
             certain time. This time can either be defined in
             seconds since 1970-01-01 or by using the letter `N',
             in which case the update time is set to be the
             current time. Negative time values are subtracted
             from the current time. An AT_STYLE TIME
             SPECIFICATION (see the rrdfetch documentation) may
             also be used by delimiting the end of the time
             specification with the `@' character instead of a
             `:'. Getting the timing right to the second is
             especially important when you are working with
             data-sources of type COUNTER, DERIVE, DCOUNTER,
             DDERIVE or ABSOLUTE.

             When using negative time values, options and data
             have to be separated by two dashes (--), else the
             time value would be parsed as an option.  See below
             for an example.

             The remaining elements of the argument are DS
             updates. The order of this list is the same as the
             order the data sources were defined in the RRA. If
             there is no data for a certain data-source, the
             letter U (e.g., N:0.1:U:1) can be specified.

             The format of the value acquired from the data
             source is dependent on the data source type chosen.
             Normally it will be numeric, but the data
             acquisition modules may impose their very own
             parsing of this parameter as long as the colon (:)
             remains the data source value separator.

Environment Variables
     The following environment variables may be used to change
     the behavior of "rrdtool update":

     RRDCACHED_ADDRESS
         If this environment variable is set it will have the
         same effect as specifying the "--daemon" option on the
         command line. If both are present, the command line
         argument takes precedence.

     RRDCACHED_STRIPPATH
         If this environment variable is set it will strip the
         leading string from the filename prior to sending the
         filename to rrdcached.  This is mostly intended to allow
         rrdcached to work with xymon and cacti tools without
         having to modify those tools.

Examples
     *   "rrdtool update demo1.rrd N:3.44:3.15:U:23"

         Update the database file demo1.rrd with 3 known and one
         *UNKNOWN* value. Use the current time as the update
         time.

     *   "rrdtool update demo2.rrd 887457267:U 887457521:22
         887457903:2.7"

         Update the database file demo2.rrd which expects data
         from a single data-source, three times. First with an
         *UNKNOWN* value then with two regular readings. The
         update interval seems to be around 300 seconds.

     *   "rrdtool update demo3.rrd -- -5:21 N:42"

         Update the database file demo3.rrd two times, using five
         seconds in the past and the current time as the update
         times.

     *   "rrdtool update --daemon unix:/tmp/rrdd.sock demo4.rrd
         N:23"

         Use the UNIX domain socket "/tmp/rrdd.sock" to contact
         the caching daemon. If the caching daemon is not
         available, update the file "demo4.rrd" directly.
         WARNING: Since a relative path is specified, the
         following disturbing effect may occur: If the daemon is
         available, the file relative to the working directory of
         the daemon is used. If the daemon is not available, the
         file relative to the current working directory of the
         invoking process is used.  This may update two different
         files depending on whether the daemon could be reached
         or not. Don't do relative paths, kids!

Authors
     Tobias Oetiker <tobi@oetiker.ch>, Florian Forster
     <octo at verplant.org>
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