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.\"
.IX Title "RRDINFO 1"
.TH RRDINFO 1 "2023-01-31" "1.7.2" "rrdtool"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
rrdinfo \- extract header information from an RRD
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fBrrdtool\fR \fBinfo\fR \fIfilename\fR
[\fB\-\-daemon\fR|\fB\-d\fR \fIaddress\fR [\fB\-\-noflush\fR|\fB\-F\fR]]
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBinfo\fR function prints the header information from an \s-1RRD\s0 in
a parsing friendly format.
.PP
Check rrdcreate if you are uncertain about the meaning of the
individual keys.
.IP "\fIfilename\fR" 8
.IX Item "filename"
The name of the \fB\s-1RRD\s0\fR you want to examine.
.IP "\fB\-\-daemon\fR|\fB\-d\fR \fIaddress\fR" 8
.IX Item "--daemon|-d address"
Address of the rrdcached daemon. If specified, a \f(CW\*(C`flush\*(C'\fR command is sent
to the server before reading the \s-1RRD\s0 files. This allows \fBrrdtool\fR 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 \fB\-l\fR option in the rrdcached manual.
.Sp
.Vb 1
\& rrdtool info \-\-daemon unix:/var/run/rrdcached.sock /var/lib/rrd/foo.rrd
.Ve
.IP "\fB\-\-noflush\fR|\fB\-F\fR" 8
.IX Item "--noflush|-F"
Omit the \f(CW\*(C`flush\*(C'\fR command usually sent to the daemon prior to retrieving the
data.  If all you are interested in is the \s-1RRD\s0 structure, and not the last update
time or current values, then this will improve efficiency.
.SH "EXAMPLE"
.IX Header "EXAMPLE"
This is the output generated by running \fBinfo\fR on a simple \s-1RRD\s0 which
contains two data sources and one \s-1RRA.\s0 Note that the number after the
\&\fIlast_update\fR keyword is in seconds since 1970. The string \fBNaN\fR
stands for \fI*UNKNOWN*\fR data. In the example it means that this \s-1RRD\s0
has neither minimum nor maximum values defined for either of its
data sources.
.PP
.Vb 10
\& 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
.Ve
.SH "ENVIRONMENT VARIABLES"
.IX Header "ENVIRONMENT VARIABLES"
The following environment variables may be used to change the behavior of
\&\f(CW\*(C`rrdtool info\*(C'\fR:
.IP "\fB\s-1RRDCACHED_ADDRESS\s0\fR" 4
.IX Item "RRDCACHED_ADDRESS"
If this environment variable is set it will have the same effect as specifying
the \f(CW\*(C`\-\-daemon\*(C'\fR option on the command line. If both are present, the command
line argument takes precedence.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tobias Oetiker <tobi@oetiker.ch>