mrtg-unix-guide - The MRTG 2.17.4 Linux/Unix Installation Guide
MRTG comes to you in Source Code. This means that you have to compile parts of it before you can use it on a Unix machine. These instructions help you to do so.
In order to compile and use mrtg you need a C compiler and a copy of perl installed on your machine. In most cases this will already be available. In case it is not, here are some starting points. Below I'll give you a detailed run through the whole compilation process. GCC The GNU C compiler comes preinstalled on most of the free Unicies out there. For commercial derivatives you may have to download and compile it first. If you have no compiler at all there is a chicken and egg problem, but there are also precompiled versions of gcc available for most operating systems. http://gcc.gnu.org/ Perl Large parts of the MRTG system are written in the Perl scripting language. Make sure there is a recent copy of perl on your machine (try perl -v). At least version 5.005 is required for mrtg to work well. If you use SNMPV3 and other new features you should use at least 5.8. You can get the latest perl from http://www.perl.com/ MRTG generates traffic graphs in the PNG format. To be able to do this it needs several 3rd party libraries. When compiling these libraries I urge you to make sure you compile them as static libraries. There is just much less trouble ahead if you are doing it like this. See the Instructions in the next section for inspiration. Note that many free unices have all the required libraries already in place so there is no need to install another copy. To check it is best to skip all the library instructions below and go straight into the mrtg compile. If the first attempt fails and you do not get a working version of mrtg, try compiling new copies of all libraries as explained below. Do this BEFORE you send email to me about problems compiling mrtg. gd This is a basic graph drawing library created by Thomas Boutell. Note that all releases after Version 1.3 only create PNG images. This is because a) Thomas got into trouble because the GIF format which it used to produce uses a compression technology patented by Unisys. b) PNG is more efficient and patent free. MRTG can work with old and new version of the GD library. You can get a recent copy of GD from: http://www.boutell.com/gd/ libpng Is required by gd in order to produce PNG graphics files. Get it from: http://www.libpng.org/pub/png/libpng.html zlib Is needed by libpng to compress the graphics files you create. Get a copy from http://www.gzip.org/zlib And last but not least you also need mrtg itself. In case you have not yet downloaded it, you can find a copy on my website: http://oss.oetiker.ch/mrtg/pub
In this section I will give you step by step instructions on how to compile the various libraries required for the compilation of mrtg. Note that these libraries may already be installed if you have a *BSD or Linux system so you can skip recompiling them. The wget program used below is a simple web downloader. You can also enter the address into your netscape if you don't have wget available. First let's create a directory for the compilation. Note that this may already exist on your system. No problem, just use it. mkdir -p /usr/local/src cd /usr/local/src If you do not have zlib installed: wget http://www.zlib.net/zlib-1.2.3.tar.gz gunzip -c zlib-*.tar.gz | tar xf - rm zlib-*.tar.gz mv zlib-* zlib cd zlib ./configure make cd .. If you don't have libpng installed wget ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng-1.2.40.tar.gz gunzip -c libpng-1.2.34.tar.gz | tar xf - mv libpng-* libpng cd libpng env CFLAGS="-O3 -fPIC" ./configure --prefix=$INSTALL_DIR make rm *.so.* *.so cd .. And now you can compile gd For versions up to 1.8.4, try: wget http://www.boutell.com/gd/http/gd-1.8.4.tar.gz gunzip -c gd-*.tar.gz |tar xf - rm gd-*.tar.gz mv gd-* gd cd gd The \ characters at the end of the following lines mean that all the following material should actually be written on a single line. perl -i~ -p -e s/gd_jpeg.o//g Makefile make INCLUDEDIRS="-I. -I../zlib -I../libpng" \ LIBDIRS="-L../zlib -L. -L../libpng" \ LIBS="-lgd -lpng -lz -lm" \ CFLAGS="-O -DHAVE_LIBPNG" cd .. For versions starting around 2.0.11, try: wget http://www.boutell.com/gd/http/gd-2.0.33.tar.gz gunzip -c gd-2.0.33.tar.gz |tar xf - mv gd-2.0.33 gd cd gd env CPPFLAGS="-I../zlib -I../libpng" LDFLAGS="-L../zlib -L../libpng" \ ./configure --disable-shared --without-freetype --without-jpeg make cp .libs/* .
Ok, now everything is ready for the mrtg compilation. cd /usr/local/src gunzip -c mrtg-2.17.4.tar.gz | tar xvf - cd mrtg-2.17.4 If all the libraries have been preinstalled on your system you can configure mrtg by doing a simple: ./configure --prefix=/usr/local/mrtg-2 Otherwise you may have to give some hints on where to find the various libraries required to compile mrtg: ./configure --prefix=/usr/local/mrtg-2 \ --with-gd=/usr/local/src/gd \ --with-z=/usr/local/src/zlib \ --with-png=/usr/local/src/libpng If you have RRDtool available you might want to tell mrtg about it so that you can opt to use rrdtool with mrtg. Check mrtg-rrd. Configure will make sure your environment is fit for building mrtg. If it finds a problem, it will tell you so and it will also tell you what to do about it. If everything is OK, you will end up with a custom Makefile for your system. Now type: make This builds the rateup binary and edits all the perl pathnames in the scripts. You can now install mrtg by typing make install (requires gnu install) All the software required by MRTG is now installed under the /usr/local/mrtg-2 subdirectory. You can now safely delete the libraries we compiled above. Then again, you might want to keep them around so that you have them available when compiling the next version of mrtg.
The next step is to configure mrtg for monitoring a network device. This is done by creating an mrtg.cfg file which defines what you want to monitor. Luckily, you don't have to dive straight in and start writing your own configuration file all by yourself. Together with mrtg you also got a copy of cfgmaker. This is a script you can point at a router of your choice; it will create a mrtg configuration file for you. You can find the script in the bin subdirectory. cfgmaker --global 'WorkDir: /home/httpd/mrtg' \ --global 'Options[_]: bits,growright' \ --output /home/mrtg/cfg/mrtg.cfg \ email@example.com This example above will create an mrtg config file in /home/mrtg/cfg assuming this is a directory visible on your webserver. You can read all about cfgmaker in cfgmaker. One area you might want to look at is the possibility of using --ifref=ip to prevent interface renumbering troubles from catching you. If you want to start rolling your own mrtg configuration files, make sure you read mrtg-reference to learn all about the possible configuration options.
Once you have created a configuration file, try the following: /usr/local/mrtg-2/bin/mrtg /home/mrtg/cfg/mrtg.cfg This will query your router and also create your first mrtg trafic graphs and webpages. When you run mrtg for the first time there will be a lot of complaints about missing log files. Don't worry, this is normal for the first 2 times you start mrtg. If it keeps complaining after this time you might want to look into the problem. Starting mrtg by hand is not ideal in the long run. So when you are satisfied with the results you can automate the process of running mrtg in regular intervals (this means every 5 minutes by default). You can either add mrtg to your crontab with a line like this: 0,5,10,15,20,25,30,35,40,45,50,55 * * * * \ <mrtg-bin>/mrtg <path to mrtg-cfg>/mrtg.cfg \ --logging /var/log/mrtg.log or if you live in Linux Land the line may look like this if you are using "crontab -e" */5 * * * * <mrtg-bin>/mrtg <path to mrtg-cfg>/mrtg.cfg \ --logging /var/log/mrtg.log or like this if you use /etc/crontab */5 * * * * mrtg-user <mrtg-bin>/mrtg <path to mrtg-cfg>/mrtg.cfg \ --logging /var/log/mrtg.log You can also run mrtg as a daemon process by adding the line RunAsDaemon: Yes to your mrtg configuration file and then creating a startup script in your system startup sequence. Unfortunately, adding startup scripts differs widely amongst different unix systems. The modern ones normally have a directory called /etc/init.d or /etc/rc.d/init.d where you put scripts which starts the process you want to run when the system boots. Further you must create a symbolic link in /etc/rc3.d or /etc/rc.d/rc?.d called S65mrtg (this is just a sample name ... it is just important that it starts with S followed by a two digit number). If you are not sure about this, make sure you consult the documentation of your system to make sure you get this right. A minimal script to put into init.d might look like this: #! /bin/sh cd /usr/local/mrtg-2.17.4/bin && ./mrtg --user=mrtg-user \ /home/httpd/mrtg/mrtg.cfg --logging /var/log/mrtg.log Note that this will only work with RunAsDaemon: Yes in your mrtg.cfg file.
Tobias Oetiker <firstname.lastname@example.org>
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.