rrdinfo (1) - Linux Manuals

rrdinfo: extract header information from an RRD


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 rrdcreate if you are uncertain about the meaning of the individual keys.

The name of the RRD you want to examine.
--daemon 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 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 "rrdtool info":
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 [at] oetiker.ch>