Multi Router Traffic Grapher 陳伯岡

Outline What is MRTG Why MRTG How MRTG work Start you own MRTG Reference Exercise & Homework

What is MRTG Multi Router Traffic Grapher – The MRTG is a tool to monitor the traffic load on network links. – MRTG generates HTML pages containing PNG images which provide a LIVE visual representation of this traffic.

Why MRTG Monitoring your computer Why not other tools? – Cacti Cacti – Nagios Nagios – Zabbix Zabbix – RRDtool RRDtool

How MRTG work mrtg.cfg /usr/bin/mrtg.png.html.log data Gather by yourself SNMP Simple Network Management Protocol

Start you own MRTG Installation – yum install mrtg net-snmp* Run snmpd – service snmpd start – chkconfig snmpd on – snmpwalk -v 1 -c public “your IP addr” system Ex: snmpwalk -v 1 -c public system

Start you own MRTG (cont.) change configuration: /etc/snmp/snmpd.conf – rocommunity public – syslocation "318" – syscontact Restart snmpd

Start you own MRTG (cont.) cfgmaker --output=/var/www/mrtg/net/mrtg.cfg \ vi mrtg.cfg – WorkDir: /var/www/mrtg/net/ – Options[local]: growright, bits – Language: BIG5 – – Title[local]:Netflow – MaxBytes[local]: – PageTop[local]: Netstat Info on indexmaker --output=/var/www/mrtg/net/index.html \ /var/www/mrtg/net/mrtg.cfg

Start you own MRTG (cont.) crontab –e – */5 * * * * /usr/bin/mrtg /var/www/mrtg/net/mrtg.cfg Then you can check the MRTG through your httpd

Reference MRTG 官方網站 – 鳥哥 MRTG – hp hp

Exercise & Homework Exercise 1. 按照投影片的步驟，利用 SNMP 監測自己主機的網路 流量 2. 利用自行抓取資料的方式，監測自己主機的 CPU 使用 率 Homework 1. 參考 reference.en.html 改變圖中線條的顏色 reference.en.html 2. 發揮想像力，監測自己主機任意一項流量