rrdinfo - extract header information from an RRD
rrdtool info filename [--daemon address]
The info function prints the header information from an RRD in a parsing friendly format.
Check the rrdcreate manpage if you are uncertain about the meaning of the individual keys.
The name of the RRD you want to examine.
Address of the the rrdcached manpage 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 the rrdcached manpage manual.
rrdtool info --daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
This is the output generated by running info on a simple RRD which contains two data sources and one RRA. Note that the number after the last_update keyword is in seconds since 1970. The string NaN stands for *UNKNOWN* data. In the example it means that this RRD has neither minimum nor maximum values defined for either of its data sources.
filename = "random.rrd" rrd_version = "0001" step = 300 last_update = 955892996 header_size = 2872 ds[a].type = "GAUGE" ds[a].minimal_heartbeat = 600 ds[a].min = NaN ds[a].max = NaN ds[a].last_ds = "UNKN" ds[a].value = 2.1824421548e+04 ds[a].unknown_sec = 0 ds[b].type = "GAUGE" ds[b].minimal_heartbeat = 600 ds[b].min = NaN ds[b].max = NaN ds[b].last_ds = "UNKN" ds[b].value = 3.9620838224e+03 ds[b].unknown_sec = 0 rra[0].cf = "AVERAGE" rra[0].pdp_per_row = 1 rra[0].cdp_prep[0].value = nan rra[0].cdp_prep[0].unknown_datapoints = 0 rra[0].cdp_prep[1].value = nan rra[0].cdp_prep[1].unknown_datapoints = 0
The following environment variables may be used to change the behavior of
rrdtoolinfo:
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.
Tobias Oetiker <tobi@oetiker.ch>