RRDINFO(1) rrdtool RRDINFO(1)

NAME

rrdinfo - extract header information from an RRD

SYNOPSIS

rrdtool info filename [--daemon|-d address [--noflush|-F]]

DESCRIPTION

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.

filename
The name of the RRD you want to examine.

--daemon|-d 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

--noflush|-F
Omit the "flush" command usually sent to the daemon prior to
retrieving the data. If all you are interested in is the RRD
structure, and not the last update time or current values,
then this will improve efficiency.

EXAMPLE

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

ENVIRONMENT VARIABLES

The following environment variables may be used to change the
behavior of "rrdtool info":

RRDCACHED_ADDRESS
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.

AUTHOR

Tobias Oetiker <tobi@oetiker.ch>

1.8.0 2022-03-14 RRDINFO(1)