CentOS 7
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MRTG : Install2015/06/16
 
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 and change

group MyRWGroup    
v2c
    local
group MyROGroup    
v2c
    mynetwork
# line 85: uncomment

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

access MyROGroup ""    
v2c
  noauth  
exact
  all   none   none
access MyRWGroup ""    
v2c
  noauth  
exact
  all   all      all
[root@dlp ~]#
systemctl start snmpd

[root@dlp ~]#
systemctl enable snmpd
# 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 3.10.0-229.4.2.el7.x86_64 #1 SMP Wed May.....
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (91954) 0:15:19.54
SNMPv2-MIB::sysContact.0 = STRING: Root <root@localhost> (configure /etc/snmp
.....
.....
SNMPv2-MIB::sysORUpTime.9 = Timeticks: (4) 0:00:00.04
SNMPv2-MIB::sysORUpTime.10 = Timeticks: (4) 0:00:00.04
[4] Configure MRTG.
[root@dlp ~]#
cfgmaker --snmp-options=:::::2 --ifref=descr --ifdesc=descr Serverworld@10.0.0.30 > /etc/mrtg/mrtg.cfg

[root@dlp ~]#
vi /etc/mrtg/mrtg.cfg
# line 8: add

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

Options[_]: growright, bits
# near line 75: uncomment all from the line & change MaxBytes value

Target[10.0.0.30_eth0]: \eth0:Serverworld@10.0.0.30:::::2
noHC[10.0.0.30_eth0]: yes
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

2015-06-16 19:54:12, Rateup WARNING: /usr/bin/rateup could not read the primary log file for 10.0.0.30_eth0 2015-06-16 19:54:12, Rateup WARNING: /usr/bin/rateup The backup log file for 10.0.0.30_eth0 was invalid as well 2015-06-16 19:54:12, Rateup WARNING: /usr/bin/rateup Can't rename 10.0.0.30_eth0.log to 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
# add in Cron

[root@dlp ~]#
vi /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 site from other hosts.
[root@dlp ~]#
vi /etc/httpd/conf.d/mrtg.conf
# line 10: uncomment and add access permission, line 11: add DirectoryIndex

Require ip
10.0.0.0/24
DirectoryIndex index.html
[root@dlp ~]#
systemctl start httpd

[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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