1. Multi Router Traffic Grapher 陳伯岡

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

3. 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.

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

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

6. 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 10.20.10.140 system

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

8. Start you own MRTG (cont.) cfgmaker --output=/var/www/mrtg/net/mrtg.cfg \ public@10.20.10.140 vi mrtg.cfg – WorkDir: /var/www/mrtg/net/ – Options[local]: growright, bits – Language: BIG5 – Target[local]:2:public@10.20.10.140 – Title[local]:Netflow – MaxBytes[local]:12500000 – PageTop[local]: Netstat Info on 10.20.10.140 indexmaker --output=/var/www/mrtg/net/index.html \ /var/www/mrtg/net/mrtg.cfg

9. 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

10. Reference MRTG 官方網站 – http://oss.oetiker.ch/mrtg/ http://oss.oetiker.ch/mrtg/ 鳥哥 MRTG – http://linux.vbird.org/linux_security/old/04mrtg.p hp http://linux.vbird.org/linux_security/old/04mrtg.p hp

11. 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 http://oss.oetiker.ch/mrtg/doc/mrtg- reference.en.html 改變圖中線條的顏色 http://oss.oetiker.ch/mrtg/doc/mrtg- reference.en.html 2. 發揮想像力，監測自己主機任意一項流量