=head1 NAME

rrddump - dump the contents of an RRD to XML format

=head1 SYNOPSIS

B<rrdtool> B<dump> I<filename.rrd> [I<filename.xml>]
S<[B<--header>|B<-h> {none,xsd,dtd}]>
S<[B<--no-header>|B<-n>]>
S<[B<--daemon>|B<-d> I<address>]>
S<[E<gt> I<filename.xml>]>

=head1 DESCRIPTION

The B<dump> function writes the contents of an B<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 B<RRD> file in a somewhat more
convenient manner.

=over 8

=item I<filename.rrd>

The name of the B<RRD> you want to dump.

=item I<filename.xml>

The (optional) filename that you want to write the XML output to.
If not specified, the XML will be printed to stdout.

=item B<--header>|B<-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.


=item B<--no-header>|B<-n>

A shortcut for S<--header=none>.

If you want to restore the dump with RRDtool 1.2 you should use the
S<--no-header> option since 1.2 cannot deal with xml headers.

=item B<--daemon>|B<-d> I<address>

Address of the L<rrdcached> daemon. If specified, a C<flush> command is sent
to the server before reading the RRD files. This allows B<rrdtool> to return
fresh data even if the daemon is configured to cache values for a long time.
When specified the RRD filename signifies a server side file, but the output
(XML) filename refers to the local side.
For a list of accepted formats, see the B<-l> option in the L<rrdcached> manual.

 rrdtool dump --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd

=back

=head1 EXAMPLES

To transfer an RRD between architectures, follow these steps:

=over 4

=item 1.

On the same system where the RRD was created, use B<rrdtool> B<dump>
to export the data to XML format.

=item 2.

Transfer the XML dump to the target system.

=item 3.

Run B<rrdtool> B<restore> to create a new RRD from the XML dump. See
B<rrdrestore> for details.

=back

=head1 ENVIRONMENT VARIABLES

The following environment variables may be used to change the behavior of
C<rrdtoolE<nbsp>dump>:

=over 4

=item B<RRDCACHED_ADDRESS>

If this environment variable is set it will have the same effect as specifying
the C<--daemon> option on the command line. If both are present, the command
line argument takes precedence.

=back

=head1 AUTHOR

Tobias Oetiker E<lt>tobi@oetiker.chE<gt>

