代码:

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安装snmp:
%cd /usr/ports/net-mgmt/net-snmp
%make install

修改/etc/rc.conf:
%ee /etc/rc.conf
加入：
------------------------------------------------------------------
snmpd_enable="YES"
snmpd_flags="-a -p /var/run/snmpd.pid"
snmptrapd_enable="YES"
snmptrapd_flags="-a -p /var/run/snmptrapd.pid"
------------------------------------------------------------------


运行下：
%/etc/netstart

编辑snmpd.conf：
%ee /usr/local/share/snmp/snmpd.conf
加入一行：
-------------------------------------------------------------
rocommunity public      #默认让snmp使用public用户
--------------------------------------------------------------


启动snmpd:
%/usr/local/etc/rc.d/snmpd.sh start


二：安装mrtg:

确定ports下的mrtg在什么位置：
%whereis mrtg
mrtg: /usr/ports/net-mgmt/mrtg

安装mrtg:
%cd /usr/ports/net-mgmt/mrtg
%make install

进入你apache的data目录（视个人情况而定，我的是/usr/local/www/apache22/data/wh-hisense/）：
%cd /usr/local/www/apache22/data/wh-hisense

在当前的WEB目录创建mrtg的目录：
%mkdir mrtg

三：配置mrtg：

进入mrtg的配置文件所在目录：
%cd /usr/local/etc/mrtg

用cfgmaker创建mrtg的配置文件：
%/usr/local/bin/cfgmaker public@mail.ahcbd.net > mrtg.cfg
记得将上面的mail.ahcbd.net换成你的主机名，

编辑mrtg.conf:
%ee mrtg.cfg
修改如下：
-----------------------------------------------------------------------------
LoadMIBs: /usr/local/share/snmp/mibs/UCD-SNMP-MIB.txt
WorkDir: /usr/local/www/apache22/data/wh-hisense/mrtg
Language: chinese
--------------------------------------------------------------------------------


并在文件尾加入：
-----------------------------------------------------------------------------------------------------
#Monitoring TCP connections
Target[tcpopen]: .1.3.6.1.2.1.6.9.0&.1.3.6.1.2.1.6.9.0:public@mail.ahcbd.net 
Options[tcpopen]: nopercent,growright,gauge,noinfo 
Title[tcpopen]: Open TCP connections 
PageTop[tcpopen]: <h1>Open TCP connections</H1>
MaxBytes[tcpopen]: 1000000 
YLegend[tcpopen]: # conns 
ShortLegend[tcpopen]: connections 
LegendI[tcpopen]:  Connections: 
Legend1[tcpopen]: Open TCP connections

#monitoring User vs Idle CPU usage
Target[kontor.cpu]:ssCpuRawUser.0&ssCpuRawIdle.0:public@mail.ahcbd.net
RouterUptime[kontor.cpu]: public@mail.ahcbd.net
MaxBytes[kontor.cpu]: 100
Title[kontor.cpu]: CPU LOAD
PageTop[kontor.cpu]: <H1>User CPU Load %</H1>
Unscaled[kontor.cpu]: ymwd
ShortLegend[kontor.cpu]: %
YLegend[kontor.cpu]: CPU Utilization
Legend1[kontor.cpu]: User CPU in % (Load)
Legend2[kontor.cpu]: Idle CPU in % (Load)
LegendI[kontor.cpu]:  User
LegendO[kontor.cpu]:  Idle
Options[kontor.cpu]: growright,nopercent


#monitoring User vs System CPU usage
Target[kontor.usrsys]:ssCpuRawUser.0&ssCpuRawSystem.0:public@mail.ahcbd.net
RouterUptime[kontor.usrsys]: public@mail.ahcbd.net
MaxBytes[kontor.usrsys]: 100
Title[kontor.usrsys]: CPU LOAD
PageTop[kontor.usrsys]: <H1>CPU (user and system) Load %</H1>
Unscaled[kontor.usrsys]: ymwd
ShortLegend[kontor.usrsys]: %
YLegend[kontor.usrsys]: CPU Utilization
Legend1[kontor.usrsys]: User CPU in % (Load)
Legend2[kontor.usrsys]: System CPU in % (Load)
LegendI[kontor.usrsys]:  User
LegendO[kontor.usrsys]:  System
Options[kontor.usrsys]: growright,nopercent

#monitoring Active CPU usage
Target[kontor.cpusum]:ssCpuRawUser.0&ssCpuRawUser.0:public@mail.ahcbd.net + 

ssCpuRawSystem.0&ssCpuRawSystem.0:public@mail.ahcbd.net 
+ ssCpuRawNice.0&ssCpuRawNice.0:public@mail.ahcbd.net
RouterUptime[kontor.cpusum]: public@mail.ahcbd.net
MaxBytes[kontor.cpusum]: 100
Title[kontor.cpusum]: CPU LOAD
PageTop[kontor.cpusum]: <H1>Active CPU Load %</H1>
Unscaled[kontor.cpusum]: ymwd
ShortLegend[kontor.cpusum]: %
YLegend[kontor.cpusum]: CPU Utilization
Legend1[kontor.cpusum]: Active CPU in % (Load)
LegendI[kontor.cpusum]:  Active
Options[kontor.cpusum]: growright,nopercent


Target[freemem]: .1.3.6.1.4.1.2021.4.11.0&.1.3.6.1.4.1.2021.4.11.0:public@mail.ahcbd.net 
Options[freemem]: nopercent,growright,gauge,noinfo 
Title[freemem]: Free Memory 
PageTop[freemem]: <h1>Free Memory</h1>
MaxBytes[freemem]: 1000000 
kMG[freemem]: k,M,G,T,P,X 
YLegend[freemem]: bytes 
ShortLegend[freemem]: bytes 
LegendI[freemem]:  Free Memory: 
Legend1[freemem]: Free memory, not including swap, in bytes

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