RRDDUMP
Section: rrdtool (1)
Updated: 2019-02-04
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NAME
rrddump - dump the contents of an RRD to XML format
SYNOPSIS
rrdtool dump filename.rrd [
filename.xml]
[
--header|
-h {none,xsd,dtd}]
[
--no-header|
-n]
[
--daemon|
-d address]
[>
filename.xml]
DESCRIPTION
The
dump function writes the contents of an
RRD in human
readable (?)
XML format to a file or to stdout. This format can
be read by rrdrestore. Together they allow you to transfer your
files from one computer architecture to another as well to
manipulate the contents of an
RRD file in a somewhat more
convenient manner.
- filename.rrd
-
The name of the RRD you want to dump.
- filename.xml
-
The (optional) filename that you want to write the XML output to.
If not specified, the XML will be printed to stdout.
- --header|-h {none,xsd,dtd}
-
By default RRDtool will add a dtd header to the xml file. Here
you can customize this to and xsd header or no header at all.
- --no-header|-n
-
A shortcut for --header=none.
If you want to restore the dump with RRDtool 1.2 you should use the
--no-header option since 1.2 cannot deal with xml headers.
- --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 dump --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
EXAMPLES
To transfer an
RRD between architectures, follow these steps:
- 1.
-
On the same system where the RRD was created, use rrdtool dump
to export the data to XML format.
- 2.
-
Transfer the XML dump to the target system.
- 3.
-
Run rrdtool restore to create a new RRD from the XML dump. See
rrdrestore for details.
ENVIRONMENT VARIABLES
The following environment variables may be used to change the behavior of
"rrdtool dump":
- 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>