3 rrdinfo - extract header information from an RRD
7 B<rrdtool> B<info> I<filename>
8 S<[B<--daemon> I<address>]>
12 The B<info> function prints the header information from an RRD in
13 a parsing friendly format.
15 Check L<rrdcreate> if you are uncertain about the meaning of the
22 The name of the B<RRD> you want to examine.
24 =item B<--daemon> I<address>
26 Address of the L<rrdcached> daemon. If specified, a C<flush> command is sent
27 to the server before reading the RRD files. This allows B<rrdtool> to return
28 fresh data even if the daemon is configured to cache values for a long time.
29 For a list of accepted formats, see the B<-l> option in the L<rrdcached> manual.
31 rrdtool info --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
37 This is the output generated by running B<info> on a simple RRD which
38 contains two data sources and one RRA. Note that the number after the
39 I<last_update> keyword is in seconds since 1970. The string B<NaN>
40 stands for I<*UNKNOWN*> data. In the example it means that this RRD
41 has neither minimum nor maximum values defined for either of its
44 filename = "random.rrd"
47 last_update = 955892996
49 ds[a].minimal_heartbeat = 600
52 ds[a].last_ds = "UNKN"
53 ds[a].value = 2.1824421548e+04
56 ds[b].minimal_heartbeat = 600
59 ds[b].last_ds = "UNKN"
60 ds[b].value = 3.9620838224e+03
63 rra[0].pdp_per_row = 1
64 rra[0].cdp_prep[0].value = nan
65 rra[0].cdp_prep[0].unknown_datapoints = 0
66 rra[0].cdp_prep[1].value = nan
67 rra[0].cdp_prep[1].unknown_datapoints = 0
69 =head1 ENVIRONMENT VARIABLES
71 The following environment variables may be used to change the behavior of
72 C<rrdtoolE<nbsp>info>:
76 =item B<RRDCACHED_ADDRESS>
78 If this environment variable is set it will have the same effect as specifying
79 the C<--daemon> option on the command line. If both are present, the command
80 line argument takes precedence.
86 Tobias Oetiker E<lt>tobi@oetiker.chE<gt>