目标：配置mrtg并每5分钟更新一次mrtg到/var/www/mrtg
一、安装snmpd, mrtg
apt-get install snmpd mrtg
mrtg是基于snmp通信，snmpd必不可少
二、配置snmpd
修改 /etc/snmp/snmpd.conf
com2sec paranoid default public
#com2sec readonly default public
#com2sec readwrite default private
为
# sec.name source community
#com2sec paranoid default public
com2sec readonly 127.0.0.1 public
#com2sec readwrite default private
创建一个source为本机，名为public的只读通信
重启snmpd
/etc/init.d/snmpd restart