Installing and Configuring MRTG + SNMP on CentOS 6

1. Install utilities:

yum install net-snmp net-snmp-utils net-snmp-devel zlib libpng gd mrtg

After installation, we have the following configuration files:

/etc/snmpd/snmpd.conf
/etc/mrtg/mrtg.cfg
/etc/cron.d/mrtg
/etc/httpd/conf.d/mrtg.conf

2. Editing SNMP config /etc/snmpd/snmpd.conf

nano /etc/snmpd/snmpd.conf

com2sec local localhost public
group MyRWGroup v1 local
group MyRWGroup v2c local
group MyRWGroup usm local
view all included .1 80
access MyRWGroup "" any noauth exact all all none
syslocation Russia
syscontact Root

3. Add the snmp service to startup and start

chkconfig snmpd on
service snmpd restart

4. Checking

snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex

the answer should be like this:

IP-MIB::ipAdEntIfIndex.123.xx.yy.zzz = INTEGER: 2
IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1

5. Configuring MRTG create a settings file /etc/mrtg/mrtg.cfg

cfgmaker --global 'WorkDir: /var/www/mrtg' --output /etc/mrtg/mrtg.cfg [email protected]

Let’s check the contents of /etc/mrtg/mrtg.cfg, look for WorkDir there and specify the correct path

WorkDir: /var/www/mrtg

6. Create the index.html file based on our /etc/mrtg/mrtg.cfg configuration file

indexmaker --output=/var/www/mrtg/index.html /etc/mrtg/mrtg.cfg

7. Checking the Cron Tab

cat /etc/cron.d/mrtg

The content should be like this:

*/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

Check if Cron Tab has been added to startup:

chkconfig --list crond

Output:

crond 0:выкл 1:выкл 2:вкл 3:вкл 4:вкл 5:вкл 6:выкл

If Cron Tab is not running and not added to startup, fix it:

chkconfig crond on
service crond start

8.configure Apache /etc/httpd/conf.d/mrtg.conf

nano /etc/httpd/conf.d/mrtg.conf

Alias /mrtg /var/www/mrtg

Order deny,allow
Deny from all
Allow from 127.0.0.1
Allow from ::1
# Allow from .example.com

127.0.0.1 change to ip, which is allowed to watch the result

Restart Apache

service httpd restart

9. Done, see the result

http://ваш_ip/mrtg/

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