Sponsored Link
MRTG Features
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 wrapping.
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 consolidation algorithm.
Automatic Configuration
MRTG comes with a set of configuration tools which make configuration and setup very simple.
Performance
Time critical routines are written in C .
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.
Prerequisites
You need to make sure you have apache2,snmp packages are installed before starting MRTG installation
sudo apt-get install apache2 snmpd snmp
Now you need to edit the /etc/snmp/snmpd.conf file
sudo vi /etc/snmp/snmpd.conf
uncomment the following line
#rocommunity public localhost
to
rocommunity public localhost
Save and exit the file
You need to restart the snmpd service using the following command
sudo systemctl snmpd restart
Install MRTG Using the following command
sudo apt-get install mrtg
MRTG Configuration
You need to create mrtg directory under /var/www/html
sudo mkdir /var/www/html/mrtg
Backup the original /etc/mrt.cfg file:
sudo cp /etc/mrtg.cfg /etc/mrtg.cfg.ORIGINAL
Now you need to edit the /etc/mrt.cfg file
vi sudo /etc/mrt.cfg
change the working directory from
WorkDir: /var/www/mrtg
to
WorkDir: /var/www/html/mrtg
Save and exit the file
Create a configuration file for MRTG:
cfgmaker @ > /etc/mrtg.cfg
In this case we are using local server we are trying to monitor and output looks similar to the following
# cfgmaker public@localhost > /etc/mrtg.cfg
--base: Get Device Info on public@localhost:
--base: Vendor Id: Unknown Vendor -- 1.3.6.1.4.1.8072.3.2.10
--base: Populating confcache
--base: Get Interface Info
--base: Walking ifIndex
--snpd: public@localhost: -> 1 -> ifIndex = 1
--snpd: public@localhost: -> 2 -> ifIndex = 2
--snpd: public@localhost: -> 3 -> ifIndex = 3
--base: Walking ifType
--snpd: public@localhost: -> 1 -> ifType = 24
--snpd: public@localhost: -> 2 -> ifType = 6
--snpd: public@localhost: -> 3 -> ifType = 6
--base: Walking ifAdminStatus
--snpd: public@localhost: -> 1 -> ifAdminStatus = 1
--snpd: public@localhost: -> 2 -> ifAdminStatus = 1
--snpd: public@localhost: -> 3 -> ifAdminStatus = 1
--base: Walking ifOperStatus
--snpd: public@localhost: -> 1 -> ifOperStatus = 1
--snpd: public@localhost: -> 2 -> ifOperStatus = 1
--snpd: public@localhost: -> 3 -> ifOperStatus = 1
--base: Walking ifMtu
--snpd: public@localhost: -> 1 -> ifMtu = 65536
--snpd: public@localhost: -> 2 -> ifMtu = 1500
--snpd: public@localhost: -> 3 -> ifMtu = 1500
--base: Walking ifSpeed
--snpd: public@localhost: -> 1 -> ifSpeed = 10000000
--snpd: public@localhost: -> 2 -> ifSpeed = 1000000000
--snpd: public@localhost: -> 3 -> ifSpeed = 1000000000
If you see the following error after running the above command you need to make sure you have completed the SNMP change discussed in the starting of this tutorial.
ERROR: did not find any matching data in cfg file
Create and index file for the webserver
indexmaker /etc/mrtg.cfg > /var/www/html/mrtg/index.html
You can access MRTG using the following URL
http://mrtg
Output looks as follows
