1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
MRTG(1) mrtg MRTG(1)
NNAAMMEE
mrtg - What is MRTG ?
DDEESSCCRRIIPPTTIIOONN
The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traf-
fic load on network links. MRTG generates HTML pages containing PNG
images which provide a LIVE visual representation of this traffic.
Check http://www.stat.ee.ethz.ch/mrtg/ to see what it does.
Go to
http://oss.oetiker.ch/mrtg for all the details about mrtg.
HHIIGGHHLLIIGGHHTTSS
Portable
MRTG works on most UNIX platforms and Windows NT.
Perl
MRTG is written in Perl and comes with full source.
Portable SNMP
MRTG Uses a highly portable SNMP implementation written entirely in
Perl (thanks to Simon Leinen). There is no need to install any
external SNMP package.
SNMPv2c support
MRTG can read the new SNMPv2c 64bit counters. No more counter wrap-
ping.
Reliable Interface Identification
Router interfaces can be identified by IP address, description and
ethernet address in addition to the normal interface number.
Constant size Logfiles
MRTG's logfiles do NOT grow thanks to the use of a unique data con-
solidation algorithm.
Automatic Configuration
MRTG comes with a set of configuration tools which make configura-
tion and setup very simple.
Performance
Time critical routines are written in C (thanks to the initiative
of Dave Rand my Co-Author).
GIF free Graphics
Graphics are generated directly in PNG format using the GD library
by Thomas Boutell.
Customizability
The look of the webpages produced by MRTG is highly configurable.
RRDtool
MRTG has built-in hooks for using RRDtool. If you are strapped for
performance this may help.
DDEETTAAIILLSS
MRTG consists of a Perl script which uses SNMP to read the traffic
counters of your routers and a fast C program which logs the traffic
data and creates beautiful graphs representing the traffic on the moni-
tored network connection. These graphs are embedded into webpages which
can be viewed from any modern Web-browser.
In addition to a detailed daily view, MRTG also creates visual repre-
sentations of the traffic seen during the last seven days, the last
five weeks and the last twelve months. This is possible because MRTG
keeps a log of all the data it has pulled from the router. This log is
automatically consolidated so that it does not grow over time, but
still contains all the relevant data for all the traffic seen over the
last two years. This is all performed in an efficient manner. There-
fore you can monitor 200 or more network links from any halfway decent
UNIX box.
MRTG is not limited to monitoring traffic, though. It is possible to
monitor any SNMP variable you choose. You can even use an external pro-
gram to gather the data which should be monitored via MRTG. People are
using MRTG, to monitor things such as System Load, Login Sessions,
Modem availability and more. MRTG even allows you to accumulate two or
more data sources into a single graph.
HHIISSTTOORRYY
In 1994 I was working at a site where we had one 64kbit line to the
outside world. Obviously, everybody was interested in knowing how the
link was performing. So I wrote a quick hack which created a constantly
updated graph on the web that showed the traffic load on our Internet
link. This eventually evolved into a rather configurable Perl script
called MRTG-1.0 which I released in spring 1995. After a few updates, I
left my job at DMU to start work at the Swiss Federal Institute of
Technology. Due to lack of time I had to put MRTG aside. One day in
January of 1996, I received email from Dave Rand asking if I had any
ideas why MRTG was so slow. Actually, I did. MRTG's programming was not
very efficient and it was written entirely in Perl. After a week or so,
Dave wrote back to me and said he had tried what I had suggested for
improving MRTG's speed. Since the changes did not help much, he had
decided to rewrite the time-critical sections of MRTG in C. The code
was attached to his email. His tool increased the speed of MRTG by a
factor of 40! This got me out of my 'MRTG ignorance' and I started to
spend my spare time developing of MRTG-2.
Soon after MRTG-2 development had begun I started to give beta copies
to interested parties. In return I got many feature patches, a lot of
user feedback and bug fixes. The product you are getting now wouldn't
be in this state if it hadn't been for the great contributions and sup-
port I received from of many people. I would like to take this opportu-
nity to thank them all. (See the files CHANGES for a long list of folk
people who helped to make MRTG what it is today.)
CCoommmmaanndd--lliinnee
Mrtg is also the name of the script you have to run to poll data and
generate the graphs. Most configuration is set through the configura-
tion file; some command-line options exist all the same.
----uusseerr _u_s_e_r_n_a_m_e and ----ggrroouupp _g_r_o_u_p_n_a_m_e
Run as the given user and/or group. (Unix Only)
----lloocckk--ffiillee _f_i_l_e_n_a_m_e
Use an alternate lock-file (the default is to use the configura-
tion-file appended with "_l").
----ccoonnffccaacchhee--ffiillee _f_i_l_e_n_a_m_e
Use an alternate confcache-file (the default is to use the configu-
ration-file appended with ".ok")
----llooggggiinngg _f_i_l_e_n_a_m_e|eevveennttlloogg
If this is set to writable filename, all output from mrtg (warn-
ings, debug messages, errors) will go to _f_i_l_e_n_a_m_e. If you are run-
ning on Win32 you can specify eevveennttlloogg instead of a filename which
will send all error to the windows event log.
NNOOTTEE::Note, there is no Message DLL for mrtg. This has the side
effect that the windows event logger will display a nice message
with every entry in the event log, complaing about the fact that
mrtg has no message dll. If any of the Windows folks want to con-
tribute one, they are welcome.
----ddaaeemmoonn
Put MRTG into the background, running as a daemon. This works the
same way as the config file option, but the switch is required for
proper FHS operation (because /var/run is writable only by root)
----ffhhss
Configure all mrtg paths to conform to the FHS specification;
http://www.pathname.com/fhs/
----cchheecckk
Only check the cfg file for errors. Do not do anything.
----ppiidd--ffiillee==ss
Define the name and path of the pid file for mrtg running as a dae-
mon
----lloogg--oonnllyy
Only update the logfile, do not produce graphics or html pages
----ddeebbuugg==ss
Enable debug options. The argument of the debug option is a comma
separated list of debug values:
cfg - watch the config file reading
dir - directory mangeling
base - basic program flow
tarp - target parser
snpo - snmp polling
fork - forking view
time - some timing info
log - logging of data via rateup or rrdtool
Example:
--debug="cfg,snpo"
RREEAADD OONN
Learn more about MRTG by going to the mrtg home page on:
http://oss.oetiker.ch/mrtg
AAUUTTHHOORR
Tobias Oetiker <tobi@oetiker.ch> and many contributors
2.16.2 2008-05-16 MRTG(1)
|
