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.\"
.IX Title "MRTG-LOGFILE 1"
.TH MRTG-LOGFILE 1 "2022-01-19" "2.17.10" "mrtg"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
mrtg\-logfile \- description of the mrtg\-2 logfile format
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
This document provides a description of the contents of
the mrtg\-2 logfile.
.SH "OVERVIEW"
.IX Header "OVERVIEW"
The logfile consists of two main sections.
.IP "The first Line" 4
.IX Item "The first Line"
It stores the traffic counters from the most recent run of mrtg.
.IP "The rest of the File" 4
.IX Item "The rest of the File"
Stores past traffic rate averages and maximum at increasing
intervals.
.PP
The first number on each line is a unix time stamp. It represents
the number of seconds since 1970.
.SH "DETAILS"
.IX Header "DETAILS"
.SS "The first Line"
.IX Subsection "The first Line"
The first line has 3 numbers which are:
.IP "A (1st column)" 4
.IX Item "A (1st column)"
A timestamp of when \s-1MRTG\s0 last ran for this interface.  The timestamp is the
number of non-skip seconds passed since the standard \s-1UNIX\s0 \*(L"epoch\*(R" of midnight
on 1st of January 1970 \s-1GMT.\s0
.IP "B (2nd column)" 4
.IX Item "B (2nd column)"
The \*(L"incoming bytes counter\*(R" value.
.IP "C (3rd column)" 4
.IX Item "C (3rd column)"
The \*(L"outgoing bytes counter\*(R" value.
.SS "The rest of the File"
.IX Subsection "The rest of the File"
The second and remaining lines of the file contains 5 numbers
which are:
.IP "A (1st column)" 4
.IX Item "A (1st column)"
The Unix timestamp for the point in time the data on this line is relevant.
Note that the interval between timestamps increases as you progress through the
file. At first it is 5 minutes and at the end it is one day between two lines.
.Sp
This timestamp may be converted in OpenOffice Calc or \s-1MS\s0 Excel by using the
following formula
.Sp
.Vb 1
\& =(x+y)/86400+DATE(1970;1;1)
.Ve
.Sp
(instead of \*(L";\*(R" it may be that you have to use \*(L",\*(R" this depends on the context and your locale settings)
.Sp
you can also ask perl to help by typing
.Sp
.Vb 1
\& perl \-e \*(Aqprint scalar localtime(x),"\en"\*(Aq
.Ve
.Sp
\&\fBx\fR is the unix timestamp and \fBy\fR is the offset in seconds
from \s-1UTC.\s0 (Perl knows \fBy\fR).
.IP "B (2nd column)" 4
.IX Item "B (2nd column)"
The average incoming transfer rate in bytes per second. This is valid
for the time between the A value of the current line and the A value of the
previous line.
.IP "C (3rd column)" 4
.IX Item "C (3rd column)"
The average outgoing transfer rate in bytes per second since the previous
measurement.
.IP "D (4th column)" 4
.IX Item "D (4th column)"
The maximum incoming transfer rate in bytes per second for the current
interval. This is calculated from all the updates which have occurred in the
current interval. If the current interval is 1 hour, and updates have
occurred every 5 minutes, it will be the biggest 5 minute transfer rate seen
during the hour.
.IP "E (5th column)" 4
.IX Item "E (5th column)"
The maximum outgoing transfer rate in bytes per second for the current interval.
.SH "AUTHOR"
.IX Header "AUTHOR"
Butch Kemper <kemper@bihs.net> and
Tobias Oetiker <tobi@oetiker.ch>