CentOS 6
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MRTG : Install
2015/01/25
 
Install MRTG (Multi Router Traffic Grapher) to see network traffic data on the web.
[1]
Install Apache HTTP Server, refer to here.
[2] Install MRTG, SNMP.
[root@dlp ~]#
yum -y install net-snmp net-snmp-utils mrtg
[3] Configure SNMP (Simple Network Management Protocol).
[root@dlp ~]#
vi /etc/snmp/snmpd.conf
# line 41: comment out

#
com2sec notConfigUser   default       public
# line 74,75: uncomment and change

# change to your local network for "mynetwork" section

# change comunity name except public or private

com2sec local
localhost
Serverworld

com2sec mynetwork
10.0.0.0/24
Serverworld
# line 78,79: uncomment

group MyRWGroup  any        local
group MyROGroup  any        mynetwork
# line 85: uncomment

view all    included  .1                               80
# line 93,94: uncomment

access MyROGroup ""      any       noauth    0      all    none   none
access MyRWGroup ""      any       noauth    0      all    all    all
[root@dlp ~]#
/etc/rc.d/init.d/snmpd start

Starting snmpd: [ OK ]
[root@dlp ~]#
chkconfig snmpd on
# show status (replace the "Serverworld" to your comunity name)

[root@dlp ~]#
snmpwalk -v2c -c Serverworld localhost system 

SNMPv2-MIB::sysDescr.0 = STRING: Linux dlp.srv.world 2.6.32-504.3.3.el6.x86_64 #1 SMP 
Wed Dec 17 01:55:02 UTC 2014 x86_64
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (168142) 0:28:01.42
...
...
SNMPv2-MIB::sysORUpTime.7 = Timeticks: (4) 0:00:00.04
SNMPv2-MIB::sysORUpTime.8 = Timeticks: (4) 0:00:00.04
[4] Configure MRTG.
[root@dlp ~]#
cfgmaker --ifref=descr --ifdesc=descr Serverworld@10.0.0.30 > /etc/mrtg/mrtg.cfg

[root@dlp ~]#
vi /etc/mrtg/mrtg.cfg
# line 9: add

WorkDir: /var/www/mrtg
# line 16: uncomment

Options[_]: growright, bits
# near line 73: make sure lines like follows are uncommented

Target[10.0.0.30_eth0]: \eth0:Serverworld@10.0.0.30:
SetEnv[10.0.0.30_eth0]: MRTG_INT_IP="10.0.0.30" MRTG_INT_DESCR="eth0"
MaxBytes[10.0.0.30_eth0]: 125000000
Title[10.0.0.30_eth0]: eth0 -- dlp.srv.world
PageTop[10.0.0.30_eth0]: <h1>eth0 -- dlp.srv.world</h1>
# execute mrtg 3 times (display warnings until 3 times)

[root@dlp ~]#
for (( i=1 ; i <= 3 ; i++ )); do env LANG=C mrtg /etc/mrtg/mrtg.cfg; done

2015-01-25 21:33:23, Rateup WARNING: /usr/bin/rateup could not read the primary log file for 10.0.0.30_eth0
2015-01-25 21:33:23, Rateup WARNING: /usr/bin/rateup The backup log file for 10.0.0.30_eth0 was invalid as well
2015-01-25 21:33:23, Rateup WARNING: /usr/bin/rateup Can't remove 10.0.0.30_eth0.old updating log file
2015-01-25 21:33:23, Rateup WARNING: /usr/bin/rateup Can't rename 10.0.0.30_eth0.log to 10.0.0.30_eth0.old updating log file
2015-01-25 21:33:23, Rateup WARNING: /usr/bin/rateup Can't remove 10.0.0.30_eth0.old updating log file
# generate index file

[root@dlp ~]#
indexmaker --columns=1 /etc/mrtg/mrtg.cfg > /var/www/mrtg/index.html
# updating is done automatically by cron

[root@dlp ~]#
cat /etc/cron.d/mrtg

*/5 * * * * root LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg --lock-file /var/lock/mrtg/mrtg_l --confcache-file /var/lib/mrtg/mrtg.ok
[5] Configure httpd to access MRTG.
[root@dlp ~]#
vi /etc/httpd/conf.d/mrtg.conf
# line 11: add IP address you allow to access

Allow from 127.0.0.1
10.0.0.0/24
[root@dlp ~]#
/etc/rc.d/init.d/httpd restart 

Stopping httpd: [  OK  ]
Starting httpd: [  OK  ]
[6] Access to the "http://(MRTG hostname or IP address)/mrtg/" from a client with HTTP, then it's possible to see MRTG site.
 
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