RRDXPORT(1)                         rrdtool                        RRDXPORT(1)



NAME
       rrdxport - Export data in XML format based on data from one or several
       RRD

SYNOPSIS
       rrdtool xport [-s|--start seconds] [-e|--end seconds]
       [-m|--maxrows rows] [--step value] [--json] [-t|--showtime] [--enumds]
       [--daemon|-d address] [DEF:vname=rrd:ds-name:CF] [CDEF:vname=rpn-
       expression] [XPORT:vname[:legend]]

DESCRIPTION
       The xport function's main purpose is to write an XML formatted
       representation of the data stored in one or several RRDs. It can also
       extract numerical reports.

       If no XPORT statements are found, there will be no output.

       -s|--start seconds (default end-1day)
           The time when the exported range should begin. Time in seconds
           since epoch (1970-01-01) is required. Negative numbers are relative
           to the current time. By default one day worth of data will be
           printed.  See also "AT-STYLE TIME SPECIFICATION" in rrdfetch for a
           detailed explanation on how to specify time.

           See "OUTPUT FORMAT" below for details on how this affects the
           output.

       -e|--end seconds (default now)
           The time when the exported range should end. Time in seconds since
           epoch.  See also "AT-STYLE TIME SPECIFICATION" in rrdfetch for a
           detailed explanation on how to specify time.

           See "OUTPUT FORMAT" below for details on how this affects the
           output.

       -m|--maxrows rows (default 400 rows)
           This works like the -w|--width parameter of rrdgraph.  In fact it
           is exactly the same, but the parameter was renamed to describe its
           purpose in this module. See rrdgraph documentation for details.

       --step value (default automatic)
           See rrdgraph documentation.

       --daemon|-d address
           Address of the rrdcached daemon. If specified, a "flush" command is
           sent to the server before reading the RRD files. This allows
           rrdtool to return fresh data even if the daemon is configured to
           cache values for a long time.  For a list of accepted formats, see
           the -l option in the rrdcached manual.

             rrdtool xport --daemon unix:/var/run/rrdcached.sock ...

       -t|--showtime
           include the time into each data row.

       --json
           produce json formatted output (instead of xml)

       --enumds
           The generated xml should contain the data values in enumerated
           tags.

            <v0>val</v0><v1>val</v1>

       DEF:vname=rrd:ds-name:CF
           See rrdgraph documentation.

       CDEF:vname=rpn-expression
           See rrdgraph documentation.

       XPORT:vname[:legend]
           At least one XPORT statement should be present. The values
           referenced by vname are printed. Optionally add a legend.

OUTPUT FORMAT
       The output is enclosed in an xport element and contains two blocks. The
       first block is enclosed by a meta element and contains some meta data.
       The second block is enclosed by a data element and contains the data
       rows.

       Let's assume that the xport command looks like this:

         rrdtool xport \
                 --start now-1h --end now \
                 DEF:xx=host-inout.lo.rrd:output:AVERAGE \
                 DEF:yy=host-inout.lo.rrd:input:AVERAGE \
                 CDEF:aa=xx,yy,+,8,* \
                 XPORT:xx:"out bytes" \
                 XPORT:aa:"in and out bits"

       The resulting meta data section is (the values will depend on the RRD
       characteristics):

         <meta>
           <start>1020611700</start>
           <step>300</step>
           <end>1020615600</end>
           <rows>14</rows>
           <columns>2</columns>
           <legend>
             <entry>out bytes</entry>
             <entry>in and out bits</entry>
           </legend>
         </meta>

       The resulting data section is:

         <data>
           <row><t>1020611700</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020612000</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020612300</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020612600</t><v>3.4113333333e+00</v><v>5.4581333333e+01</v></row>
           <row><t>1020612900</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020613200</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020613500</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020613800</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020614100</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020614400</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020614700</t><v>3.7333333333e+00</v><v>5.9733333333e+01</v></row>
           <row><t>1020615000</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020615300</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>
           <row><t>1020615600</t><v>NaN</v><v>NaN</v></row>
         </data>

       All the statistics in the output will use the same step. The first
       sample will be the first sample starting immediately after --start. The
       last sample will be the one ending at or immediately after --end.

       Each sample has a timestamp and one or more values. The timestamps
       associated with a value in RRDtool ALWAYS represent the time the sample
       was taken. Since any value you sample will represent some sort of past
       state your sampling apparatus has gathered, the timestamp will always
       be at the end of the sampling period.

       RRDtool does not store the actual samples, but does internal resampling
       of the values presented to it. Nevertheless when a data value is
       presented with a single timestamp the timestamp is at the end of the
       period the value represents. Note that the timestamp itself is outside
       the period the sample is valid for. For more details about this, see
       PDP calculation explanation.

       So the time range for a sample with a timestamp is actually from
       "timestamp - step" inclusive to "timestamp" exclusive.

       The first line of the sample output:

           <row><t>1020611700</t><v>3.4000000000e+00</v><v>5.4400000000e+01</v></row>

       therefore means that the values for the interval 1020611400 to
       1020611699 were 3.4 and 54.4 for "out bytes" and "in and out bits"
       respectively, because the value was taken at 1020611700.

EXAMPLE 1
         rrdtool xport \
                 DEF:out=if1-inouts.rrd:outoctets:AVERAGE \
                 XPORT:out:"out bytes"

EXAMPLE 2
         rrdtool xport \
                 DEF:out1=if1-inouts.rrd:outoctets:AVERAGE \
                 DEF:out2=if2-inouts.rrd:outoctets:AVERAGE \
                 CDEF:sum=out1,out2,+ \
                 XPORT:out1:"if1 out bytes" \
                 XPORT:out2:"if2 out bytes" \
                 XPORT:sum:"output sum"

ENVIRONMENT VARIABLES
       The following environment variables may be used to change the behavior
       of "rrdtool xport":

       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.

AUTHOR
       Tobias Oetiker <tobi@oetiker.ch>



1.9.0                             2024-07-29                       RRDXPORT(1)
