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>