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rrdinfo

NAME

rrdinfo - extract header information from an RRD

SYNOPSIS

rrdtool info filename [--daemon address]

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 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
 
 

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>