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RRDUPDATE(1)                        rrdtool                       RRDUPDATE(1)



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

SYNOPSIS
       rrdtool {update | updatev} filename [--template|-t ds-name[:ds-name]...]  [--daemon address] [--]
       N|timestamp:value[:value...]  at-timestamp@value[:value...]  [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.

       --daemon address
               If given, RRDTool will try to connect to the caching daemon rrdcached at address and will fail if the
               connection cannot be established. If the connection is successfully established the values will be sent
               to the daemon instead of accessing the files directly.

               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 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.

               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.

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 --cache /var/lib/rrd/demo3.rrd N:42"

           Update the file "/var/lib/rrd/demo3.rrd" with a single data source, using the current time. If the caching
           daemon cannot be reached, do not fall back to direct file access.

       ?   "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 <tobiAToetiker.ch>, Florian Forster <octo at verplant.org>



1.4.7                             2009-06-02                      RRDUPDATE(1)