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.
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@oetiker.ch>