# 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 the rrdcreate manpage 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 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

# 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 `rrdtoolinfo`:

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>