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

rrdtool xport [-s|--start seconds] [-e|--end seconds] [-m|--maxrows rows] [--step value] [DEF:vname=rrd:ds-name:CF] [CDEF:vname=rpn-expression] [XPORT:vname[:legend]]

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 section in the rrdfetch documentation for a detailed explanation on how to specify time.

-e|--end seconds (default now)

The time when the exported range should end. Time in seconds since epoch. See also AT-STYLE TIME SPECIFICATION section in the rrdfetch documentation for a detailed explanation of ways to specify time.

-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.

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.

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>

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

  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"

Tobias Oetiker <oetiker@ee.ethz.ch>