RRDDUMP(1) rrdtool RRDDUMP(1)

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>

1.8.0 2022-03-14 RRDDUMP(1)