# phpman > man > rrddump(1)

[RRDDUMP(1)](https://www.chedong.com/phpMan.php/man/RRDDUMP/1/markdown)                                     rrdtool                                    [RRDDUMP(1)](https://www.chedong.com/phpMan.php/man/RRDDUMP/1/markdown)



## 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>>



1.7.2                                        2022-03-17                                   [RRDDUMP(1)](https://www.chedong.com/phpMan.php/man/RRDDUMP/1/markdown)